灰常简单的代码代码：
public class A
{
    @Deprecated
    public static void method() {}

    public static void main(String args[]){
        A.method();//no deprecated warning,don't know why, weird!!!
        B.method();//deprecated warning works.
    }
}

class B{@Deprecated
    public static void method() {}}

为啥子捏？