JAVA Beginner's Video Tutorial

• Chapter1 JAVA computer basics
• 1-1 computer overview
• 1-2 Computer Hardware and Software Overview
• 1-3 Software Development and Computer Languages ​​Overview
• 1-4 human-computer interaction
• 1-5 Keyboard function keys and shortcut keys
• 1-6 How to open a DOS console
• 1-7 Common DOS commands explained
• 1-8 Extended DOS commands
• Chapter2 JAVA language basics (1)
• 2-1 Java language overview
• 2-2 Java language cross-platform principle
• 2-3 Overview of JDK and JRE)
• 2-4 JDK download process diagram
• 2-5 JDK installation process diagram
• 2-6 Illustration of the uninstallation process of JDK
• 2-7 Introduction to Java development tools and introduction to JDK
• 2-8 Writing and running the first HelloWorld case
• 2-9 Summary of common problems in development
• 2-10 Why configure the path environment variable
• 2-11 How to configure Path environment variable 1
• 2-12 How to configure Path environment variable 2
• 2-13 The role of classpath and its configuration
• 2-14 The difference between path and classpath
• 2-15 Notepad++ installation and configuration
• 2-16 Use Notepad++ to develop programs and compile and run them
• Chapter3 JAVA language basics (2)
• 3-1 Overview and use of keywords
• 3-2 Overview and composition rules for identifiers
• 3-3 Common naming rules for identifiers
• 3-4 Overview of annotations and their classification
• 3-5 HelloWorld case added to annotated version
• 3-6 The role of comments
• 3-7 Overview and use of constants
• 3-8 Overview of base systems and illustrations of binary, octal and hexadecimal systems
• 3-9 Representation forms of different base data
• 3-10 Conversion diagram from arbitrary base to decimal
• 3-11 Exercises from arbitrary base to decimal
• 3-12 Conversion diagram from decimal to arbitrary base
• 3-13 Exercises from decimal to arbitrary base
• 3-14 Fast base conversion method
• 3-15 Explanation of the original code's complement
• 3-16 Practice of inverting and complementing the original code
• 3-17 Overview and format of variables
• 3-18 Overview and classification of data types
• 3-19 Define variables of different data types
• 3-20 Things to note when using variables
• 3-21 Data type conversion default conversion
• 3-22 Illustration of variables of different data types participating in operations
• 3-23 Data type conversion cast
• 3-24 Questions about forced conversion
• 3-25 What is the difference between adding variables and adding constants? Interview questions
• 3-26 How to calculate the result after forced conversion of data overflow
• 3-27 Character data participates in operations
• 3-28 Strings participate in operations
• Chapter4 JAVA language basics (3)
• 4-1 Several minor issues added to data types
• 4-2 Basic usage of arithmetic operators
• 4-3 Usage of arithmetic operators ++ and --
• 4-4 Exercises with arithmetic operators ++ and --
• 4-5 Various uses of arithmetic operator +
• 4-6 Basic usage of assignment operators
• 4-7 Assignment operator interview questions
• 4-8 Basic usage of comparison operators and their precautions
• 4-9 Basic usage of logical operators
• 4-10 The difference between logical operators && and &
• 4-11 Basic usage of bit operators 1
• 4-12 Characteristics of bitwise XOR operator
• 4-13 Bit operations interview questions
• 4-14 Basic usage of bit operators 2 and interview questions
• 4-15 Basic usage of ternary operator
• 4-16 Exercises with the ternary operator
• 4-17 An explanation of the basic format of keyboard entry
• 4-18 Keyboard entry exercise 1
• 4-19 Keyboard entry exercise 2
• 4-20 sequential structure statement
• 4-21 Select structure if statement format 1
• 4-22 Things to note when choosing a structure if statement
• 4-23 Select structure if statement format 2
• 4-24 Exercises for selecting structure if statement format 2
• 4-25 Conversion problem between format 2 of if statement and ternary
• 4-26 Select structure if statement format 3
• 4-27 Exercises for selecting structure if statement format 3
• 4-28 Exercises for selecting structure if statement format 3
• 4-29 Nested use of selection structure if statements
• Chapter5 JAVA language basics (4)
• 5-1 The format and explanation of the select structure switch statement
• 5-2 Basic use of the switch statement in the selection structure
• 5-3 Things to note when choosing a structural switch statement
• 5-4 Select structure switch statement exercise 1 to see the program writing results
• 5-5 Select structure switch statement exercise 2 multiple choice questions
• 5-6 Select structure switch statement exercise 3 expression is a string
• 5-7 Respective usage scenarios of the selection structure switch and if statements
• 5-8 Loop Structure Loop Statement Overview
• 5-9 The format and basic use of the loop structure for statement
• 5-10 Things to note about the loop structure for statement
• 5-11 Exercise 1 of loop structure for statement to obtain data
• 5-12 Exercise 2 Summing Thoughts of Loop Structure for Statement
• 5-13 Exercise 3 of even sum of loop structure for statement
• 5-14 Exercise 4 factorial of loop structure for statement
• 5-15 Exercise 5 Narcissus of loop structure for statement
• 5-16 Exercise 6 of improved version of palindrome number for loop structure for statement
• 5-17 Exercise 7 Statistical Thoughts on Loop Structure for Statement
• 5-18 Exercise 8 of the loop structure for statement while taking the remainder problem
• 5-19 The format and basic use of the while statement in the loop structure
• 5-20 Exercise 1 Summation Thoughts of Loop Structure While Statement
• 5-21 Exercise 2 Statistical Thoughts on Loop Structure While Statement
• 5-22 The difference between loop structure while statement and for statement
• 5-23 Practice Everest of loop structure while statement
• 5-24 The format and basic use of the loop structure do...while statement
• 5-25 Differences between three types of loop statements in loop structures
• 5-26 Loop structure loop precautions - infinite loop
• 5-27 Loop structure loop nesting outputs stars in 4 rows and 5 columns
• 5-28 Loop structure loop nesting output equilateral triangle
• 5-29 Loop structure multiplication table
• 5-30 Control jump statement break statement
• 5-31 Control jump statement continue statement
• 5-32 Control jump statement return statement
• 5-33 The combination of while statement and break uses Xiaofang to save money
• Chapter6 JAVA language basics (5)
• 6-1 Method overview and format description
• 6-2 Method definition summation case
• 6-3 Method calls with clear return values
• 6-4 Method call diagram
• 6-5 Exercise 1 of the method to get the larger of two numbers
• 6-6 Method Exercise 2 Compare two numbers for equality
• 6-7 Method Exercise 3: Obtain the maximum value of three numbers
• 6-8 Notes on methods
• 6-9 Method call Definition and call of void type method
• 6-10 Exercise 4 of the method outputs a star based on the number of rows and columns
• 6-11 Method Exercise 5: Output the corresponding multiplication table based on keyboard input
• 6-12 Overview and basic usage of method overloading
• 6-13 Method overloading practice comparing data for equality
• 6-14 Array overview and definition format instructions
• 6-15 Initialization of arrays Dynamic initialization
• 6-16 Memory allocation in Java and the difference between stack and heap
• 6-17 Memory diagram of array 1 an array
• 6-18 Array memory diagram 2 two arrays
• 6-19 Array memory diagram 3 three arrays
• 6-20 Initialization of arrays, static initialization and memory map
• 6-21 Two common minor problems with array operations: out-of-bounds and null pointers
• 6-22 Array operation 1 traversal
• 6-23 Array operation 2 obtains the maximum value
• 6-24 Array operations 3 reverse order
• 6-25 Array operations 4 table lookup method
• 6-26 Array operations 5 basic search
• 6-27 Overview of two-dimensional arrays and explanation of format 1
• 6-28 Memory diagram of two-dimensional array format 1
• 6-29 Explanation of two-dimensional array format 2
• 6-30 Memory diagram of two-dimensional array format 2
• 6-31 Explanation of two-dimensional array format 3
• 6-32 Memory diagram of two-dimensional array format 3
• 6-33 Two-dimensional array exercise 1 traversal
• 6-34 Two-dimensional array exercise 2 summation
• 6-35 Two-dimensional array exercise 3 Yang Hui triangle
• 6-36 Question 1: Parameter passing issues and illustrations in Java
• 6-37 Thinking Question 2 Analysis of Encryption Issues
• 6-38 Question 2 Implementation of the code for encryption issues
• 6-39 Question 2: Code improvements for encryption issues
• Chapter7 JAVA object-oriented (1)
• 7-1 Introduction of ideas and overview of process-oriented ideas
• 7-2 Overview of ideas and examples
• 7-3 Elephant put into refrigerator case
• 7-4 development, design and features
• 7-5 Classes and Objects
• 7-6 Overview of class definitions and analysis of student classes
• 7-7 Definition of student class
• 7-8 Definition of mobile phone category
• 7-9 Student use
• 7-10 Use of mobile phones
• 7-11 The memory map of an object
• 7-12 Memory map of two objects
• 7-13 Memory map of three objects
• 7-14 The difference between member variables and local variables
• 7-15 How to call the method when the formal parameter is the class name
• 7-16 Overview and applications of anonymous objects
• 7-17 Package overview
• 7-18 Encapsulation benefits and design principles
• 7-19 Overview and characteristics of the private keyword
• 7-20 Private application standard cases
• 7-21 Overview and application of this keyword
• 7-22 Memory diagram of this keyword
• 7-23 Standard mobile phone code and its testing
• 7-24 Constructor method overview and format
• 7-25 (Overloading and precautions of constructor methods
• 7-26 Classification and use of member methods
• 7-27 Code and tests for a standard student class
• 7-28 A standard mobile phone code and test
• 7-29 What is done to create the object
• 7-30 When to define member variables
• 7-31 Rectangle case exercise
• Chapter8 JAVA object-oriented (2)
• 8-1 Employee case exercises
• 8-2 Implement addition, subtraction, multiplication and division by yourself and test it
• 8-3 Introduction of static keyword
• 8-4 Characteristics of static keyword
• 8-5 static memory diagram
• 8-6 Precautions for static
• 8-7 The difference between static variables and member variables
• 8-8 Detailed explanation of the format of the main method
• 8-9 Use static in tool classes
• 8-10 Improvement of tools
• 8-11 Instructions making process
• 8-12 Use of tools and instructions
• 8-13 How to use the help documentation provided by JDK
• 8-14 Learn the random number function of Math class through JDK help documentation
• 8-15 Guess the number game case
• 8-16 Overview and classification of code blocks
• 8-17 Code block to see program writing results
• 8-18 Introduction and overview of inheritance
• 8-19 Inheritance cases and benefits of inheritance
• 8-20 Disadvantages of inheritance
• 8-21 Inheritance characteristics of classes in Java
• 8-22 Note on implementation of inheritance and when to use inheritance
• 8-23 Relationship between member variables in inheritance
• 8-24 The difference and application of this and super
• 8-25 The relationship between constructors and methods in inheritance
• 8-26 Things to note about constructors in inheritance
• 8-27 Interview questions in inheritance 1
• 8-28 Interview questions 2 in inheritance
• 8-29 Interview questions 3 in inheritance
• 8-30 Member method relationship in inheritance
• 8-31 Application of method overriding
• 8-32 Things to note about method overriding
• 8-33 Two interview questions
• 8-34 Using student and teacher cases before inheritance
• 8-35 Student and teacher cases using inheritance
• 8-36 Cat and dog case analysis
• 8-37 Cat and dog case implementation and testing
• Chapter9 JAVA object-oriented (3)
• 9-1 final keyword introduction
• 9-2 The final keyword modifies the characteristics of classes, methods and variables
• 9-3 The final keyword modifies local variables
• 9-4 Initialization timing of final modified variables
• 9-5 Overview and prerequisites for polymorphism
• 9-6 Provide code reflection according to the premise of polymorphism
• 9-7 Member access characteristics in polymorphism
• 9-8 Advantages of polymorphism
• 9-9 Disadvantages of polymorphism
• 9-10 Upcasting and downcasting in polymorphism
• 9-11 The case of Confucius pretending to be a father explains the phenomenon of polymorphism
• 9-12 Memory diagram in polymorphic inheritance
• 9-13 Memory diagram of object changes in polymorphism
• 9-14 Cat and dog case polymorphic version
• 9-15 Cases of Northerners and Southerners
• 9-16 Polymorphic exercises to see program writing results
• 9-17 Introduction of abstract classes
• 9-18 Characteristics of abstract classes
• 9-19 Characteristics of members of abstract classes
• 9-20 Abstract class practice cat and dog case
• 9-21 Abstract practice teacher case
• 9-22 Abstract practice student case
• 9-23 Abstract class practice employee case
• 9-24 Small problems in abstract classes
• 9-25 Introduction of interface
• 9-26 Interface characteristics
• 9-27 Interface member characteristics
• 9-28 The relationship between classes, classes and interfaces, and interfaces
• 9-29 The difference between abstract class and interface
• 9-30 Cat and dog case adding high jump function analysis
• 9-31 Cat and dog case adds high jump function code implementation
• 9-32 Teacher and student cases add smoking function analysis and code implementation
• Chapter10 JAVA object-oriented (4)
• 10-1 Athletes and coaches case studies
• 10-2 Athletes and coaches case implementation
• 10-3 Athletes and Coaches Case Tests
• 10-4 Class name as formal parameter
• 10-5 Abstract class name as formal parameter
• 10-6 Interface name as formal parameter
• 10-7 Class name as return value type
• 10-8 Abstract class name as return value type
• 10-9 Interface name as return value type
• 10-10 chain programming
• 10-11 Overview and function of package keyword
• 10-12 Package definition and precautions
• 10-13 Compile and run packaged classes
• 10-14 Access between classes in different packages
• 10-15 Overview and use of the import keyword
• 10-16 Testing of four permission modifiers
• 10-17 Common modifiers used by classes and their components
• 10-18 Internal class overview and access characteristics
• 10-19 Internal class classification and direct use of member internal classes
• 10-20 Common modifiers and applications of member inner classes
• 10-21 Interview questions for member internal classes
• 10-22 Problem with local inner class accessing local variables
• 10-23 Format and understanding of anonymous inner classes
• 10-24 Anonymous inner class method call
• 10-25 Application of anonymous inner classes in development
• 10-26 Anonymous inner class interview questions
• Chapter11 JAVA development tools
• 11-1 Introduction to common development tools
• 11-2 Overview of Eclipse and MyEclipse
• 11-3 Download, install and uninstall Eclipse
• 11-4 How to write a HelloWorld case in Eclipse
• 11-5 How to compile and run programs in Eclipse
• 11-6 Eclipse Chinese translation and grammar checking tips
• 11-7 Eclipse windows and views overview
• 11-8 Basic configuration of Eclipse workspace
• 11-9 How to use content auxiliary keys in Eclipse
• 11-10 How to use shortcut keys in Eclipse
• 11-11 Automatic generation of constructor and get_set methods in Eclipse
• 11-12 Simplification of inheriting abstract classes or implementing interfaces in Eclipse
• 11-13 How to write a standard student class and its test in Eclipse
• 11-14 Write high jump interface abstract animal class and concrete animal subclass in Eclipse
• 11-15 How to generate a jar package in Eclipse and import it into a new project
• 11-16 How to create help documents and use jar packages in Eclipse
• 11-17 How to delete projects and import projects in Eclipse
• 11-18 Small issues to pay attention to when importing projects into Eclipse
• 11-19 Things to note when receiving projects during Eclipse development
• 11-20 Basic use of debug in Eclipse
• 11-21 Eclipse looks at parameter passing issues in Java
• 11-22 API overview
• 11-23 Learn the similarities and differences between Chinese and programming languages
• 11-24 Overview of Object class
• 11-25 hashCode() method of Object class
• 11-26 getClass() method of Object class
• 11-27 toString() method of Object class
• 11-28 equals() method of Object class
• 11-29 Code optimization of equals() method of Object class
• 11-30 finalize() method and clone() method of Object class
• Chapter12 JAVA common objects (1)
• 12-1 Scanner overview and construction method principles
• 12-2 Explanation of hasNextXxx() and nextXxx() methods of Scanner class
• 12-3 Scanner to obtain data minor problems and solutions
• 12-4 Overview of the String class
• 12-5 String class constructor
• 12-6 Characteristics of String cannot be changed once assigned
• 12-7 The difference between String literal objects and objects created by constructors
• 12-8 String interview questions look at the program writing results
• 12-9 Judgment function of String class
• 12-10 Simulated user login case
• 12-11 Breakpoint to view simulated user login case
• 12-12 The enhanced version of the simulated user login case joins the guessing game
• 12-13 Breakpoint view simulated user login case enhanced version joins the guessing game
• 12-14 Get function of String class
• 12-15 String traversal
• 12-16 Cases of counting the number of uppercase, lowercase and numeric characters
• 12-17 Breakpoint to view statistics on the number of uppercase, lowercase and numeric characters
• 12-18 Conversion function of String class
• 12-19 Convert the first letter of the string to uppercase and the rest to lowercase
• 12-20 Other functions of String class
• 12-21 Source code analysis of compareTo() method of String class
• 12-22 A case of concatenating int arrays into strings
• 12-23 An improved version of the case of concatenating int arrays into strings
• 12-24 String reversal case
• 12-25 Illustration of case ideas for finding the number of occurrences of a small string in a large string
• 12-26 Case code implementation of finding the number of occurrences of a small string in a large string
• 12-27 Find the number of occurrences of a small string in a large string case code optimization
• 12-28 Breakpoint to view the case of finding the number of occurrences of a small string in a large string
• 12-29 Overview of StringBuffer
• 12-30 Constructor method of StringBuffer class
• 12-31 Added functionality to StringBuffer
• 12-32 StringBuffer deletion function
• 12-33 StringBuffer replacement function
• Chapter13 JAVA common objects (2)
• 13-1 StringBuffer reverse function
• 13-2 StringBuffer interception function
• 13-3 Conversion between StringBuffer and String
• 13-4 Example of concatenating arrays into strings in a specified format
• 13-5 String reversal function example
• 13-6 Determine whether a string is symmetrical case
• 13-7 Two small interview questions about StringBuffer
• 13-8 String and StringBuffer are passed as parameters respectively
• 13-9 Illustration of the principle of advanced bubble sorting of arrays
• 13-10 Array advanced bubble sort code implementation
• 13-11 Illustration of the principle of advanced selection sorting of arrays
• 13-12 Array advanced selection sort code implementation
• 13-13 Sorting characters in a string case
• 13-14 Illustration of the principle of advanced binary search in arrays
• 13-15 Array advanced binary search code implementation
• 13-16 Things to note when using binary search
• 13-17 Overview and use of Arrays tool class
• 13-18 Source code analysis of Arrays tool class
• 13-19 Introduction of basic type wrapper classes
• 13-20 Integer constructor
• 13-21 Conversion between String and int types
• 13-22 Operation of base conversion in Integer
• 13-23 New features of JDK5: automatic boxing and unboxing
• 13-24 Interview questions about direct assignment of Integer
• 13-25 Overview of Character
• 13-26 Explanation of common methods of Character
• 13-27 Count the number of uppercase, lowercase and number occurrences in a string
• 13-28 How to verify a QQ number case
• 13-29 Overview and basic use of regular expressions
• 13-30 Regular expression composition rules
• 13-31 Regular expression judgment function
• 13-32 Verification email case
• 13-33 Regular expression split function
• Chapter14 JAVA common objects (3)
• 14-1 A small exercise in splitting functions
• 14-2 Sorting numbers in a string case
• 14-3 Regular expression replacement function
• 14-4 Overview of Patterns and Matchers
• 14-5 Regular expression acquisition function
• 14-6 Math class overview and method usage
• 14-7 How to get random number cases in any range
• 14-8 Overview and method usage of Random class
• 14-9 An explanation of the garbage collection method gc() in the System class
• 14-10 Explanation of exit() and currentTimeMillis() in System class
• 14-11 Explanation of arraycopy() in System class
• 14-12 Overview and construction method of BigInteger
• 14-13 The use of addition, subtraction, multiplication and division of BigInteger
• 14-14 Introduction and overview of BigDecimal
• 14-15 Use of addition, subtraction, multiplication and division of BigDecimal
• 14-16 Overview and construction method of Date
• 14-17 Conversion between date and milliseconds in Date class
• 14-18 DateFormat implements mutual conversion between dates and strings
• 14-19 Writing and testing cases for date tool classes
• 14-20 How many days have you been in this world? Case Study
• 14-21 Overview of the Calendar class and methods for obtaining calendar fields
• 14-22 add() and set() methods of Calendar class
• 14-23 How to get the number of days in February of any year
• Chapter15 JAVA collection framework (1)
• 15-1 JAVA collection framework (1)
• 15-2 Memory diagram for array of objects
• 15-3 The origin of sets and their differences from arrays
• 15-4 Collection inheritance system diagram
• 15-5 Collection function overview
• 15-6 Basic functional testing of Collection collection
• 15-7 Advanced functional testing of Collections
• 15-8 Collection traversal, set to array traversal
• 15-9 Collection stores custom objects and iterates through cases
• 15-10 Iterator traversal of collections
• 15-11 Collection stores custom objects and iterates through cases
• 15-12 Discussion on issues using iterators
• 15-13 Illustration of steps for using collections
• 15-14 The principle and source code analysis of iterators
• 15-15 Collection stores strings and traverses
• 15-16 Collection stores student objects and traverses
• 15-17 List stores strings and traverses
• 15-18 Characteristics of List collection
• 15-19 List stores student objects and traverses
• 15-20 Overview and testing of unique features of List collection
• 15-21 Unique traversal function of List collection
• 15-22 List stores custom objects and traverses
• 15-23 Unique functions of ListIterator
• 15-24 Causes and solutions of concurrent modification exceptions
• 15-25 Data structures stack and queue
• 15-26 Data structures arrays and linked lists
• 15-27 Characteristics of the three subclasses of List
• 15-28 ArrayList stores strings and traverses
• 15-29 ArrayList stores custom objects and traverses
• 15-30 Vector’s unique features
• 15-31 Unique functions of LinkedList
• 15-32 Remove duplicate string elements from the ArrayList collection Case 1
• 15-33 Breakpoint view to remove duplicate elements case 1
• 15-34 Remove duplicate string elements from the ArrayList collection Case 2
• Chapter16 JAVA collection framework (2)
• 16-1 Case of removing duplicate custom object elements from ArrayList collection
• 16-2 Collection code to implement stack structure using LinkedList
• 16-3 Use LinkedList to simulate a collection of stack data structures and merge test cases
• 16-4 Generics Overview and Basic Usage
• 16-5 ArrayList stores strings and traverses the generic version
• 16-6 ArrayList stores custom objects and traverses the generic version
• 16-7 Introducing generics through Object transformation issues
• 16-8 Overview and use of generic classes
• 16-9 Overview and use of generic methods
• 16-10 Overview and use of generic interfaces
• 16-11 Advanced generic wildcards
• 16-12 Enhance the overview and use of for
• 16-13 ArrayList stores strings and traverses the enhanced for version
• 16-14 ArrayList stores custom objects and traverses the enhanced for version
• 16-15 Overview and use of static imports
• 16-16 Overview and use of variable parameters
• 16-17 Use of the asList() method of the Arrays tool class
• 16-18 Case illustration of collection nested storage and traversal elements
• 16-19 Case code implementation of collection nested storage and traversal elements
• 16-20 Generating 10 random numbers between 1 and 20 requires that the random numbers cannot be repeated.
• 16-21 Case of inputting multiple data with the keyboard and outputting the maximum value on the console
• 16-22 Source code analysis of toString() method of ArrayList collection
• 16-23 User login registration case analysis illustration
• 16-24 Detailed analysis of user login registration cases and implementation of subcontracting
• 16-25 User login registration case implementation of user basic description class and user operation interface
• 16-26 User login registration case specific implementation of user operation class
• 16-27 Implementation of user test class for user login registration case
• 16-28 User login registration case user test class small problem solving
• 16-29 User login registration case join the guessing number game
• 16-30 Console shopping management system function demonstration
• 16-31 Set collection overview and characteristics
• 16-32 HashSet stores strings and traverses
• 16-33 Source code analysis of HashSet to ensure element uniqueness
• Chapter17 JAVA collection framework (3)
• 17-1 HashSet stores custom objects and traverses
• 17-2 HashSet code implementation and illustration to ensure element uniqueness
• 17-3 HashSet stores custom objects and iterates through exercises
• 17-4 Overview and use of LinkedHashSet
• 17-5 TreeSet stores elements of type Integer and traverses them
• 17-6 Source code analysis of TreeSet to ensure element sorting
• 17-7 The principles and diagrams of TreeSet to ensure element uniqueness and natural ordering
• 17-8 TreeSet stores custom objects and traverses exercise 1
• 17-9 TreeSet stores custom objects and traverses Exercise 2
• 17-10 The principle and code implementation of TreeSet to ensure element uniqueness and comparator sorting
• 17-11 Reinterpretation of the source code of TreeSet's add() method and summary of TreeSet's sorting of elements
• 17-12 Generate 10 random numbers between 1-20 and require that the random numbers cannot be repeated. Simple version of the case
• 17-13 Case study of inputting student information with the keyboard and sorting it by total score and then outputting it on the console
• 17-14 Map collection overview and features
• 17-15 Function overview of Map collection
• 17-16 Basic functional testing of Map collection
• 17-17 Map collection acquisition function test
• 17-18 Map collection traversal to find the key value
• 17-19 Traversing the Map collection to find the key and value of the key-value pair object
• 17-20 Comparison of two methods of Map collection traversal
• 17-21 A case where the HashMap collection key is Stirng and the value is String
• 17-22 A case where the HashMap collection key is an Integer and the value is a String
• 17-23 The case where the HashMap collection key is String and the value is Student
• 17-24 The case where the HashMap collection key is Student and the value is String
• 17-25 Overview and use of LinkedHashMap
• 17-26 TreeMap collection key is a String value is a case of String
• 17-27 The case where the TreeMap collection key is Student and the value is String
• 17-28 Case illustration of counting the number of occurrences of each character in a string
• 17-29 Case code implementation for counting the number of occurrences of each character in a string
• 17-30 Breakpoint to view statistics of the number of occurrences of each character in a string
• 17-31 Case of HashMap collection nested HashMap collection
• 17-32 Case of HashMap collection nested ArrayList collection
• 17-33 Case of ArrayList collection nested HashMap collection
• Chapter18 JAVA collection framework (4)
• 18-1 Aggregate multiple levels of nested data analysis
• 18-2 Collection of multi-level nested code manifestations
• 18-3 The difference between HashMap and Hashtable
• 18-4 Overview of the Collections utility class
• 18-5 Explanation of common methods of Collections tool class
• 18-6 ArrayList stores custom objects and sorts cases
• 18-7 Simulate the card shuffling and dealing of Landlords
• 18-8 Illustration of the principle of simulating the card shuffling, dealing and sorting of cards in Landlord
• 18-9 Code implementation to simulate Doudizhu shuffling and dealing cards and sorting the cards
• 18-10 Summary of characteristics and data structures of collections
• 18-11 How to choose which collection to use?
• 18-12 Summary of common functions and traversal methods of various collections
• Chapter19 JAVA IO stream (1)
• 19-1 Overview of IO streaming technology
• 19-2 Overview and classification of exceptions
• 19-3 How the JVM handles exceptions by default
• 19-4 Handling exceptions using try...catch 1
• 19-5 Handling exceptions using try...catch 2
• 19-6 JDK7’s handling solution for multiple exceptions
• 19-7 The difference between compile-time exceptions and run-time exceptions
• 19-8 Several common methods of Throwable
• 19-9 Handling exceptions using throws
• 19-10 Overview of throw and the difference from throws
• 19-11 How to handle exceptions?
• 19-12 Characteristics and functions of finally keyword
• 19-13 Interview questions: The difference between final, finally and finalize
• 19-14 Interview question: If there is return before finally
• 19-15 An overview of variations in exception handling and custom exceptions
• 19-16 Implementation and testing of custom exceptions
• 19-17 Unusual precautions
• 19-18 Overview and construction method of File class
• 19-19 File class creation function
• 19-20 Delete function of File class
• 19-21 Renaming function of File class
• 19-22 Judgment function of File class
• 19-23 File class acquisition function
• 19-24 Advanced acquisition functions of File class
• 19-25 Example of outputting the file name with the specified suffix in the specified directory
• 19-26 File filter improvement case for outputting file names with specified suffixes in specified directories
• 19-27 Source code of list() method with file name filter
• 19-28 Batch modification of file names case
• 19-29 Recursion overview and considerations
• 19-30 Ideas and illustrations of recursive problem solving
• 19-31 Code implementation and memory diagram for recursively finding factorial
• 19-32 Breakpoint to view the execution process of recursive factorial calculation
• 19-33 Immortal Rabbit Problem Case
• Chapter20 JAVA IO stream (2)
• 20-1 Example of recursively outputting the absolute paths of all java files in a specified directory
• 20-2 Recursively delete directory with content case
• 20-3 Breakpoint to view the execution process of deleting a directory with content
• 20-4 Overview and classification of IO flows
• 20-5 Overview of IO stream base class and a simple requirements analysis
• 20-6 Constructor of FileOutputStream
• 20-7 FileOutputStream writes data
• 20-8 Three write() methods of FileOutputStream
• 20-9 FileOutputStream writes data to implement line breaks and append writing
• 20-10 FileOutputStream writes data and adds exception handling
• 20-11 FileInputStream reads data
• 20-12 Byte stream copy text file case 1
• 20-13 How does the computer recognize and concatenate two bytes into Chinese?
• 20-14 Byte stream copy text file case 2
• 20-15 Byte stream copy picture case
• 20-16 Byte stream copy video case 1
• 20-17 FileInputStream reads data one byte array at a time
• 20-18 Comparison of two ways to read data using FileInputStream
• 20-19 Byte stream copy text file case 3
• 20-20 Byte stream copy video case 2
• 20-21 BufferedOutputStream writes data
• 20-22 BufferedInputStream reads data
• 20-23 Four ways of byte stream copying MP4 and testing efficiency
• 20-24 Reasons and formats for the occurrence of conversion streams
• 20-25 Overview of coding tables and common coding tables
• 20-26 Encoding and decoding issues in String class
• 20-27 Use of conversion stream OutputStreamWriter
• 20-28 Use of conversion stream InputStreamReader
• 20-29 5 ways to write data in character streams
• 20-30 Two ways to read data from character streams
• 20-31 Character stream copy text file case 1
• 20-32 Character stream copy text file case 2
• 20-33 Character stream copy text file case 3
• Chapter21 JAVA IO stream (3)
• 21-1 The use of character buffer output stream BufferedWriter
• 21-2 The use of character buffer input stream BufferedReader
• 21-3 Character buffer stream copy text file case 1
• 21-4 Special features of character buffer streams
• 21-5 Character buffer stream copy text file case 2
• 21-6 IO flow summary diagram
• 21-7 5 ways to copy text files
• 21-8 4 ways to copy pictures
• 21-9 Example of storing data in a collection into a text file
• 21-10 Store data in text files into collections case
• 21-11 Randomly obtain name cases from text files
• 21-12 Copy single-level folder case
• 21-13 Copy the file with the specified suffix in the specified directory and modify the name case
• 21-14 Breakpoint to view the execution process of copying files and modifying the suffix name case
• 21-15 Copy multi-level folder case
• 21-16 Case study of inputting student information using the keyboard, sorting it by total score and writing it into a text file
• 21-17 Example of sorting strings in one file and then writing them to another file
• 21-18 Custom class simulates BufferedReader's readLine() function case
• 21-19 Use cases for LineNumberReader
• 21-20 Custom class simulates LineNumberReader's function case of getting line numbers
• 21-21 Knowledge review of login registration cases
• 21-22 Login registration case IO version implementation
• 21-23 Overview and explanation of data input and output flows
• 21-24 Overview and explanation of memory operation flow
• 21-25 Overview and features of print streams
• 21-26 PrintWriter is used as a subclass of Writer
• 21-27 PrintWriter implements automatic refresh and line wrapping
• 21-28 Print flow improvement copy text file case
• 21-29 Overview of standard input and output streams and the nature of output statements
• 21-30 Three ways to achieve keyboard entry
• Chapter22 JAVA IO stream (4)
• 22-1 Output statements are improved with character buffer streams
• 22-2 Random access flow overview and writing out data
• 22-3 Random access streams read data and manipulate file pointers
• 22-4 Combined streams read the contents of two files and copy them into one file
• 22-5 Merge streams to read the contents of multiple files and copy them into one file
• 22-6 Overview and use of serialization and deserialization streams
• 22-7 How to solve the yellow warning line problem during serialization
• 22-8 How to prevent object member variables from being serialized
• 22-9 Overview of Properties and use as a Map collection
• 22-10 Use of special functions of Properties
• 22-11 Load() and store() functions of Properties
• 22-12 Determine whether the specified key exists in the file. If so, modify the value.
• 22-13 How to make the guessing number game only playable 5 times
• 22-14 Introduction to NIO and a case of NIO under JDK7
• Chapter23 JAVA multi-threading (1)
• 23-1 The introduction of multi-threaded programs
• 23-2 Process overview and the significance of multiple processes
• 23-3 Overview of threads and the significance of multithreading
• 23-4 Examples of multithreading and the difference between parallelism and concurrency
• 23-5 Is the running principle of Java program and the startup of JVM multi-threaded?
• 23-6 How to implement multi-threading and multi-threading method 1 ideas
• 23-7 Code implementation of multi-threading mode 1
• 23-8 Get and set thread object name
• 23-9 Thread scheduling and getting and setting thread priority
• 23-10 Thread control sleeping thread
• 23-11 Thread control - joining thread
• 23-12 Thread control courtesy thread
• 23-13 Thread control daemon thread
• 23-14 Thread control interrupt thread
• 23-15 Thread life cycle diagram
• 23-16 The idea and code implementation of multi-threading mode 2
• 23-17 Graphical comparison and differences between two methods of multithreading
• 23-18 Case Study of Selling Movie Tickets by Inheriting Thread Class
• 23-19 Case Study of Selling Movie Tickets by Implementing Runnable Interface
• 23-20 Analysis of the reasons why there are same tickets and negative tickets when buying movie tickets
• 23-21 Analysis of the causes of thread safety issues
• 23-22 Synchronized code blocks solve thread safety issues
• 23-23 Explanation of synchronized code blocks solving thread safety issues
• 23-24 Characteristics, benefits and drawbacks of synchronization
• 23-25 Fast locks for synchronized code and problems with application of synchronization methods and locks
• 23-26 Review of previous thread-safe classes
• 23-27 Overview and use of Lock after JDK5
• 23-28 Overview and use of deadlock problems
• 23-29 Producer-consumer problem description diagram
• Chapter24 JAVA multi-threading (2)
• 24-1 Producer consumer problem code 1
• 24-2 Producer consumer question code 2 and solve thread safety issues
• 24-3 Illustration of the producer-consumer waiting wake-up mechanism idea
• 24-4 Code implementation of producer-consumer waiting wake-up mechanism
• 24-5 Code analysis of producer-consumer waiting wake-up mechanism
• 24-6 Thread state transition diagram and common execution situations
• 24-7 Overview and use of thread groups
• 24-8 Producer-consumer waiting wake-up mechanism code optimization
• 24-9 Overview and use of thread pools
• 24-10 The idea and code implementation of multi-threading mode 3
• 24-11 Summing case of multi-threading mode 3
• 24-12 Implementing multi-threaded programs using anonymous inner classes
• 24-13 Overview and use of timers
• 24-14 Multiple execution code embodiment of scheduled tasks
• 24-15 Delete specified directories with content regularly
• 24-16 Common interview questions about multithreading
• Chapter25 JAVA design patterns
• 25-1 An overview of common object-oriented design principles
• 25-2 Overview and classification of design patterns
• 25-3 Overview and use of simple factory pattern
• 25-4 Overview and use of the factory method pattern
• 25-5 Singleton pattern: Hungry style
• 25-6 The lazy style of singleton pattern
• 25-7 Java code in singleton mode embodies the Runtime class
• Chapter26 JAVA GUI
• 26-1 GUI overview and the difference between GUI and CLI
• 26-2 The difference between java.awt and javax.swing packages
• 26-3 Component inheritance diagram in GUI
• 26-4 HelloWorld form case
• 26-5 Optimize HelloWorld form case code
• 26-6 Overview and examples of event listening mechanism principles
• 26-7 Form close case
• 26-8 Adapter design pattern explained
• 26-9 Adapter class improves form closing case
• 26-10 Add a button to the form and add an event case to the button
• 26-11 Transfer text box value to text field case
• 26-12 Change the background color by moving the mouse over the button case
• 26-13 How to control that only numeric characters can be entered in the text box
• 26-14 First level menu case
• 26-15 Multi-level menu case
• 26-16 Overview and use of Netbeans
• 26-17 Simulation of four arithmetic operations cases
• 26-18 Modify the icon code of the form
• 26-19 How to set the code to center the form
• 26-20 How to modify the code of the form's skin
• 26-21 Add checksum prompts to four arithmetic operations cases
• 26-22 Review of the package structure of user login registration
• 26-23 Implementation of basic functions of user login and registration
• 26-24 User login and registration interface implementation
• 26-25 User login and registration interface jumps
• 26-26 The final version of user login registration
• 26-27 User login registration to join four arithmetic operations cases
• Chapter27 JAVA network programming
• 27-1 Network Programming Overview
• 27-2 Network model overview and illustration
• 27-3 Overview of the three elements of network programming
• 27-4 Overview of IP in the Three Elements of Network Programming 1
• 27-5 IP Overview of Three Elements of Network Programming 2
• 27-6 Overview and use of the InetAddress class
• 27-7 Ports of the three elements of network programming
• 27-8 Protocols of the three elements of network programming
• 27-9 Socket communication principle diagram
• 27-10 UDP protocol sends data
• 27-11 UDP protocol receives data
• 27-12 Diagram of sending and receiving data using UDP protocol
• 27-13 UDP protocol sending and receiving data code optimization
• 27-14 The data on the sending end comes from the keyboard entry case
• 27-15 DOS window demonstration simple chat applet
• 27-16 Multi-threaded chat room program
• 27-17 Demonstration of a GUI version of the chat program case
• 27-18 TCP protocol sends data
• 27-19 TCP protocol receives data
• 27-20 Illustration of sending and receiving data using TCP protocol
• 27-21 The server gives the client a feedback case
• 27-22 Client keyboard input server console output
• 27-23 Client keyboard input server writes to text file
• 27-24 Client reads text file server console output
• 27-25 TCP protocol upload text file
• 27-26 TCP upload text file and give feedback
• 27-27 TCP protocol uploads pictures and gives feedback
• 27-28 Thoughts on uploading multiple clients to one server
• 27-29 Multi-threading improves the case of multiple clients uploading files
• Chapter28 JAVA Reflection
• 28-1 Class loading overview and loading timing
• 28-2 Overview and classification of class loaders
• 28-3 Reflection overview
• 28-4 Three ways to obtain class file objects
• 28-5 Obtain the no-argument constructor through reflection and use
• 28-6 Obtain the parameterized constructor through reflection and use
• 28-7 Get the private constructor via reflection and use
• 28-8 Get member variables through reflection and use
• 28-9 Obtain member methods with no parameters and return values ​​through reflection and use
• 28-10 Obtain member methods with parameters and return values ​​through reflection and use
• 28-11 Run configuration file contents via reflection
• 28-12 Bypassing generic checks via reflection
• 28-13 Write a general method to set a certain property of an object to a specified value through reflection
• 28-14 Lead intermediaries through user additions, deletions, modifications and student logins and registrations
• 28-15 Overview and implementation of dynamic agents
• 28-16 Overview and use of template design patterns
• 28-17 Decoration mode overview and usage
• Chapter29 JAVA JDK5 new features
• 29-1 Review of new features of JDK5
• 29-2 Implement your own enumeration class
• 29-3 Implement enum class through enum
• 29-4 Notes on enumerations
• 29-5 Common ways to enumerate classes
• 29-6 Review and explanation of six new features of JDK7
• 29-7 Download, install and uninstall JDK
• 29-8 Interfaces can also have methods