java中基础的Annotation--@Override @Deprecated @SuppressWarnings

一、@Override：重写,使用Override后，明确告诉编译器这是重写的方法，若不是，编译器会报错

二、Deprecated：声明过期操作，告诉开发者这个方法已经过期

class Book {
@Deprecated
public void fun(){
System.out.println("过期了");
}
}

public class Main {
public static void main(String[] args) {
Book b = new Book();
b.fun();
}
}

三、@SuppressWarnings：压制一个或多个警告，取消了警告信息

class Book<E> {
private E title;
public void setTitle(E title) {
this.title = title;
}
public E getTitle() {
return title;
}

}

public class Main {
@SuppressWarnings("unchecked")
public static void main(String[] args) {
@SuppressWarnings("rawtypes")
Book b = new Book();
b.setTitle("暮光之城");
}

}