What are the class methods in java

Java's class method can also be called a static method, which is a method in a class modified with static; because the class method belongs to the entire class, the method body of the class method There cannot be content related to objects of the class.

That is, the class method body has the following restrictions: (Recommended learning: java course)

1. Objects cannot be referenced in class methods Variable;

2. The object method of the class cannot be called in the class method;

3. The super and this keyword cannot be called in the class method;

4. Class Methods cannot be overridden.

Test Case

public class Test {

    private int a = 5;
    private static int b = 10;
    public static void yiStatic()
    {
//        a = 10;//静态方法无法访问非静态成员变量
        System.out.println("yiStatic");
    }
    public void yiInstance()
    {
        a = 10;
        b = 5;//非静态方法可以访问静态变量
        System.out.println("yiInstanc");
    }
    public void yiInstance2()
    {
        yiStatic();//非静态方法可以访问非静态方法
        yiInstance();//非静态方法可以访问静态方法
        System.out.println("yiInstance2");
    }
    public static void yiStatic2()
    {
        yiStatic();//静态方法可以访问静态方法
//        yiInstance();//静态方法不可以访问非静态方法
        System.out.println("yiStatic2");
    }
}

Through this test we found that instance methods, that is, non-static methods, can access any variables and methods in the class (including static and non-static) , while only static variables and static methods can be accessed in static methods.

The above is the detailed content of What are the class methods in java. For more information, please follow other related articles on the PHP Chinese website!