Java @Override 注解

@Override注解,不是关键字,但可以当关键字使用,可以选择添加这个注解,在你不留心重载而并非复写了该方法时,编译器就会产生一条错误:The method doh(Milhouse) of type Bart must override or implement a supertype method

// reusing/hide.java

//owrloading a base method name in a derived

package object;

import static net.mindview.util.Print.*;

class Homer{

    char doh(char c)

    {

        print("doh(char)");

        return 'd';

    }

    float doh(float f)

    {

        print("doh(float");

        return 1.f;

    }

}

class Milhouse{}

class Bart extends Homer{

    void doh(Milhouse m)

    {

        print("doh(Milhouse");

    }

    @Override char doh(char c) //基类必须也有char doh(char c)方法

    {

        print("I have not heavy load");

        return 'a';

    }

}

public class Hide {

    public static void main(String[] args)

    {

        Bart b = new Bart();

        b.doh(1);

        b.doh('x');

        b.doh(1.0f);

        b.doh(new Milhouse());

    }

}/* output:

doh(float

I have not heavy load

doh(float

doh(Milhouse

*///~