How to implement rewriting in interface in java

Ordinary class implements interface

1. Both ordinary methods and abstract methods must be rewritten;

2. The default method can be rewritten or not Rewrite.

Abstract class implements interface

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by abstract If you use a class to implement an interface, you don't have to override the interface's methods. You can not rewrite all methods or only rewrite some methods.

public interface Demo {
	 public void test1();//普通方法，需要重写
	 public abstract void test2();//抽象方法
	 public static void test3() {}//静态方法，接口中的静态方法不能被实现类继承和子接口继承
	 public default void test4(){}//默认方法可以直接使用实现类的对象进行调用，也可以在实现类中对其进行覆盖重写。
	 public static void main(String[] args) {}//接口可以有主函数
}

public class TestDemo implements Demo{

	@Override
	public void test1() {
	}

	@Override
	public void test2() {}
	
	@Override
	public void test4(){}//重写默认函数，也可以不重写

	
	

}

abstract class TestDemo01 implements Demo{
	
}

Note:

1. Default methods and static methods need to have method bodies;

2. Static methods cannot be overridden.

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