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- There are several forms of construction methods of File class in Java
- The form of the constructor method of File class in Java is: 1. [File (File parent, String child)]; 2. [File (String pathname)]; 3. [File (String parent, String child)].
- Javagetting Started 2971 2020-07-20 16:52:11
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- Detailed introduction to java abstract classes
- This article comes from the Java introductory tutorial column. It introduces the relevant knowledge about abstract classes in Java in detail. It has certain reference value and I hope it can help everyone. When a class method is modified with the abstract keyword, the method is called an abstract method.
- Javagetting Started 3103 2020-07-18 17:12:29
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- Analyze the process of object instantiation
- The process of object instantiation: first declare the object, open a space in the stack, name it the name of the object, and the content is null; then use new to open a space in the heap; finally, store the address of the space in the heap on the stack That’s it.
- Javagetting Started 1954 2020-07-18 16:49:17
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- Introduction to the use of Random class in Java
- The Random class is used to generate pseudo-random numbers. It has two constructors. One constructor uses the default seed, and the other constructor needs to explicitly pass in a long integer seed.
- Javagetting Started 2926 2020-07-17 16:49:44
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- What is the difference between class and Class in Java?
- Java introductory tutorial: This article introduces to you the difference between class and Class in Java. It has certain reference value and I hope it can help you. Class is a keyword in Java that is used when declaring a class. Class is a class, which is equivalent to the abstraction and collection of classes.
- Javagetting Started 4128 2020-07-17 16:26:01
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- How to install JDK in Win10?
- How to install JDK in Win10: First, go to the official website to find the JDK version corresponding to Windows, and download it locally; then double-click to open the JDK installer and install it; finally, set the environment variables CLASS_PATH and JAVA_HOME.
- Javagetting Started 3042 2020-07-17 15:49:55
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- What language is Java?
- Java is an object-oriented programming language that not only absorbs the advantages of the C++ language, but also abandons the difficult-to-understand concepts in C++. Therefore, the Java language has two characteristics: powerful functions and simplicity and ease of use. Java implements the object-oriented theory extremely well, allowing programmers to perform complex programming with an elegant way of thinking.
- Javagetting Started 5854 2023-01-06 14:43:54
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- What is the difference between static variables and instance variables in Java
- Java introductory tutorial: This article introduces you to the relevant knowledge of static variables and instance variables. It has certain reference value and I hope it can help you. Static variables belong to classes, and instance variables belong to objects. Static variables need to be modified with the static keyword, but instance variables do not.
- Javagetting Started 3308 2020-07-16 16:58:04
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- What is the difference between jdk and jre
- The difference between jdk and jre is: jdk is a java development tool kit, which provides the development environment and operating environment of java; jre is the java operating environment, which provides the required environment for the operation of java. jdk actually includes jre, and also includes javac, the editor that compiles java source code.
- Javagetting Started 4106 2020-07-16 16:44:13
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- What is method overloading in Java
- Overloading of methods in Java means that two methods have the same method name but different parameter types and number of parameters. Then one method can be said to be an overload of another method. In method overloading, the return type of the method and the method's modifiers can also be different.
- Javagetting Started 10975 2020-07-16 10:56:45
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- What should you pay attention to when using the final keyword?
- Java introductory tutorial: This article introduces you to the relevant knowledge about what you need to pay attention to when using the final keyword. It has certain reference value and I hope it can help everyone. Classes modified by final cannot be inherited, and methods modified by final cannot be overridden.
- Javagetting Started 3362 2020-07-15 17:01:02
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- What are the ways to create objects in Java
- The ways to create objects in Java are: 1. Create through new; 2. Create through reflection newInstance(); 3. Create through the clone() method of the Object class; 4. Create through deserialization.
- Javagetting Started 2460 2020-07-15 16:51:23
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- What is the difference between sleep() and wait() in Java?
- The difference between sleep() and wait() in Java is: sleep() is a method of the thread class, which can suspend the execution of the thread for a specified time and give execution opportunities to other processes; wait() is a method of the Object class, and the object calls wait( ) method causes this thread to give up the object lock.
- Javagetting Started 2715 2020-07-15 16:42:14
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- What is the main class of a Java program?
- Java introductory tutorial: This article introduces you to the relevant knowledge about the main class of Java programs. It has certain reference value and I hope it can help you. In a Java application, the main class refers to the class that contains the main() method.
- Javagetting Started 7905 2020-07-14 16:56:30
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- Detailed introduction to the commonly used Java class String class
- String class represents string. All string literals in Java programs are implemented as instances of this class. Strings are constants and their values cannot be changed after they are created. Because String objects are immutable, they can be shared.
- Javagetting Started 2614 2020-07-14 16:44:21
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