homework_some.java

import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;

/**
 * Created by LikeJust on 2017-08-19.
 * TODO: Question
 */
public class HuWa {
    static public void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, CloneNotSupportedException {
        System.out.println();
        MyMap<MeMe, String> meMeStringMyMap = new MyMap<>();

        MeMe m1 = new MeMe(10, meMeStringMyMap);

        meMeStringMyMap.put(m1, "Hello");

        System.out.println(m1);
        System.out.println(meMeStringMyMap);

        m1 = m1.setV(10);

        System.out.println(m1);
        System.out.println(meMeStringMyMap);
    }
}

class MyMap<K, V> extends HashMap<K, V> {
    K newPut(MeMe meMe) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException, CloneNotSupportedException {
        if (containsKey(meMe)) {
            V v = get(meMe);
            remove(meMe);
            K newk = (K) meMe.clone();
            put(newk, v);
            return newk;
        } else {
            return null;
        }
    }
}

class MeMe implements Cloneable {
    private int v;
    private MyMap<MeMe, String> myMap = null;

    @Override
    protected Object clone() throws CloneNotSupportedException {
        MeMe me = (MeMe) super.clone();
        me.myMap = myMap;
        return me;
    }

    MeMe(int v, MyMap<MeMe, String> myMap) {
        this.v = v;
        this.myMap = myMap;
    }

    MeMe setV(int v) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, CloneNotSupportedException {
        this.v = v;
        return myMap.newPut(this);
    }
}