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- What is mapping in java
- If we want to know information about certain keys and want to find the elements corresponding to them. The map data structure is designed for this purpose. Maps are used to store key/value pairs. If the key is provided, the value can be looked up. There is a one-to-one correspondence between them.
- Javagetting Started 11709 2019-11-12 16:57:12
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- How to initialize java array
- Static initialization: During initialization, the programmer specifies the initial value of each array element, and the system determines the length of the array. arrayName=new type[]. Dynamic initialization: The programmer specifies the length of the array during initialization, and the system initializes the default value of each array element. arrayName=new type[].
- Javagetting Started 5486 2019-11-12 16:44:57
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- What are the differences between java locks?
- The difference between Java locks: fair locks and unfair locks, reentrant locks, exclusive locks and shared locks, mutual exclusion locks and read-write locks, optimistic locks and pessimistic locks, segmented locks, biased locks, lightweight locks and Heavyweight lock, spin lock.
- Javagetting Started 2038 2019-11-12 16:31:08
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- How to break out of a loop in java
- There are three ways to break out of a loop in Java: break: The default is to jump out of the innermost loop, which is the closest loop where break is located. continue: Terminates this cycle and continues the next cycle. return: End the current method.
- Javagetting Started 6123 2019-11-12 16:12:57
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- How to completely uninstall Java
- The method to completely uninstall Java is: 1. Delete the configured environment variables; 2. Uninstall JavaSE; 3. Delete all Java-related folders in the C drive; 4. Delete the JavaSoft folder in the registry; 5. Restart the computer.
- Javagetting Started 6834 2019-11-12 16:11:36
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- What does this in java mean?
- This in java represents the class instance itself. Usage of this: (1) Represents a reference to the current object; (2) Represents a member variable of the class, not a function parameter. Pay attention to distinguishing between function parameters and member variables when they have the same name; (3) Used for reference in the constructor A constructor that satisfies the specified parameter types.
- Javagetting Started 10877 2019-11-12 15:52:48
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- What is a class in java
- A class is a collection of entities with some common characteristics. It is an abstract data type, which is an abstraction of entities with the same characteristics. In object-oriented programming languages, a class is an abstraction of the properties and behavior of a type of "thing".
- Javagetting Started 5334 2019-11-12 15:46:17
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- what is exception in java
- An Exception in Java, also known as an exception, is an event that occurs during program execution and interrupts the normal instruction flow of the executing program. In order to handle running errors in the program promptly and effectively, exception classes must be used.
- Javagetting Started 4292 2019-11-12 15:39:21
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- What is a reference in java
- If the type of a variable is a class type rather than a basic type, then the variable is also called a reference. Starting from JDK 1.2, object references are divided into four levels, allowing programs to more flexibly control the object's life cycle. These four levels, from high to low, are: strong reference, soft reference, weak reference and virtual reference.
- Javagetting Started 4345 2019-11-12 15:32:53
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- What is the difference between java characters and bytes
- Byte is byte, which is the basic data type in Java. Characters are semantic units, and they are encoded. A character may be encoded into 1, 2, or even 3, 4 bytes. This is related to the character set encoding. English letters and numbers are single-byte, but characters in natural languages such as Chinese characters are multi-byte.
- Javagetting Started 3438 2019-11-12 15:24:47
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- What are the annotation methods in java
- The comment methods in Java are: 1. Single-line comments, format: //content; 2. Multiple-line comments, format: /*content*/; 3. Document comments, format: /**content*content*/.
- Javagetting Started 5919 2019-11-12 15:21:15
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- How many bytes does the long type occupy in java?
- The long type in Java occupies 8 bytes. The minimum value of the long type is: -9,223,372,036,854,775,808 (-2^63); the maximum value is 9,223,372,036,854,775,807 (2^63 -1).
- Javagetting Started 10254 2019-11-12 13:47:45
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- How to determine whether a java object is empty
- There are two judgment methods for the tool StringUtils: "StringUtils.isEmpty(CharSequence cs);" or "StringUtils.isEmpty(Object str);".
- Javagetting Started 4220 2019-11-12 13:47:31
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- The solution to the problem of garbled characters when importing java projects into myeclipse
- The solution to the Chinese garbled code when importing java projects in myeclipse: 1. Set the encoding of the entire project to UTF-8; 2. Set the encoding of the java source file to UTF-8; 3. Modify the encoding method of a single project to UTF-8.
- Javagetting Started 2958 2019-11-12 13:33:14
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- What do java modifiers modify?
- The Java language provides many modifiers, which are mainly divided into two categories: access modifiers and non-access modifiers; modifiers are used to modify classes, methods or variables, and are usually placed at the front of a statement.
- Javagetting Started 1984 2019-11-12 13:28:46
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