How to use java's JDK annotations

1. @Override: used for methods, indicating that the method overrides the parent class method, such as toString().

//#2.1 JDK5.0 复写父类方法
class Parent1_2{
public void init(){
}
}
class Son1_2 extends Parent1_2{
@Override
public void init() {
}
}
 
//#2.2 JDK6.0 实现父接口方法
interface Parent1_3{
public void init();
}
class Son1_3 implements Parent1_3{
@Override
public void init() {
}
}

2. @Deprecated: Indicates that the method has expired and is not recommended for developers to use.

//#1 方法过期
class Parent1_1{
@Deprecated
public void init(){
    }
}

3. @FunctionalInterface: Used to agree on functional interfaces.

Functional interface: If there is only one abstract method in the interface (which can contain multiple default methods or multiple static methods), the interface is called a functional interface.

@FunctionalInterface
public interface AD {
    public void adAttack();
}

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