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Network programming tutorial
  • Basic structure of Java classes and programs

    Basic structure of Java classes and programs

    The basic structure of Java classes and programs. A Java application consists of several classes. These classes can be in one source file or distributed among several source files. A Java application has a main class, which is the class that contains the
    2024-11-08
  • Java object references and entities

    Java object references and entities

    References and entities of Java objects We already know from the previous study that the variables declared by the class are called objects. The object, that is, the variable, is responsible for storing references to ensure that the object can operate the
    2024-11-08
  • Java uses objects

    Java uses objects

    The purpose of Java using object abstraction is to produce classes, and the purpose of classes is to create objects with properties and behaviors. Objects can not only manipulate their own variables to change state, but also call methods in the class to p
    2024-11-08
  • Java creates objects

    Java creates objects

    Java creates object classes, which are the most important data types in object-oriented languages. You can use classes to declare variables. In object-oriented languages, variables declared with classes are called objects. Different from basic data types,
    2024-11-08
  • Java class constructor

    Java class constructor

    Constructor method of Java class The constructor method is a special method in the class. Its constructor needs to be used when the program creates an object with the class. The name of the constructor in the class must be exactly the same as the name of
    2024-11-08
  • Java methods

    Java methods

    The content of a Java method class body is divided into variable declaration and method definition. The method definition includes two parts: method header and method body. The basic format is as follows: method header {   &
    2024-11-08
  • Java member variables

    Java member variables

    The contents of the Java member variable class body are divided into variable declarations and method definitions. The variables declared in the variable declaration part are called member variables or domain variables. The type of member variables can be
    2024-11-08
  • Comparison of Java interfaces and abstract classes

    Comparison of Java interfaces and abstract classes

    Comparison of Java interfaces and abstract classes 1. Comparison of Java interfaces and abstract classes (1) Both abstract (abstract) classes and interfaces can have abstract (abstract) methods. (2) Interfaces can only have constants, not variables, while
    2024-11-08
  • Java interface parameters

    Java interface parameters

    Java Interface Parameters If you are going to pass a numeric value to a method parameter, you may want the method parameter to be of type double, so that you can pass byte, int, long, float and double data to the parameter. If a method parameter is an int
    2024-11-08
  • Java interface callback

    Java interface callback

    Java interface callback interface, like classes, is also an important data type in the Java language. Variables declared with interfaces are called interface variables. So what kind of data can be stored in interface variables? First of all, interfaces ar
    2024-11-08
  • Java implementation interface

    Java implementation interface

    Java implements interfaces In the Java language, interfaces are implemented by classes in order to use the methods in the interface. A class needs to declare that the class implements one or more interfaces using the keyword implements in the class declar
    2024-11-08
  • Java interface

    Java interface

    Java interface Interface is an important data type in the Java language. The keyword interface is usually used to define an interface. The definition of interface is very similar to the definition of class, which is divided into interface declaration and
    2024-11-08
  • Java abstract classes and abstract methods

    Java abstract classes and abstract methods

    Java abstract class and abstract method 1.abstract class We call the class modified with the keyword abstract as an abstract class, that is, an abstract class, for example: abstract class A {&……
    2024-11-08
  • Java inheritance and polymorphism

    Java inheritance and polymorphism

    Java Inheritance and Polymorphism We all know that "mammals have many kinds of sounds", such as: "roar", "howl", "bark", "meow", etc. This is...
    2024-11-08
  • Upcast object of Java object

    Upcast object of Java object

    We know that the tiger is an animal. If the animal class is the parent class of the tiger class, it should be noted that when the tiger is an animal, the tiger will lose the unique attributes and functions of the tiger. From the perspective of human think
    2024-11-08
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