JDK注解入门样例

public class AnnotationTest {
	
	//压制警告(告诉编译器不要在提醒我了)
	@SuppressWarnings("deprecation")
	public static void main(String[] args) {
		System.runFinalizersOnExit(true);
		
		AnnotationTest.sayHello();
		
	}
	
	//标注该方法过时
	@Deprecated
	public static void sayHello() {
		System.out.println("this method is deprecated");
	}
}

public class SuperClass {
	
	public void sayHello() {
		System.out.println("这是父类的方法!");
	}
}

public class SonClass extends SuperClass{

	//标识该方法是重写父类的方法
	@Override
	public void sayHello() {
		System.out.println("this is song method!");
	}
}