MapEntry.java

package chapter17.nine;

import java.util.Comparator;
import java.util.Map;
import java.util.Map.Entry;

public class MapEntry<K, V> implements Map.Entry<K,V>{

	private K key;
	private V value;
	public MapEntry(K next, V next2) {
		// TODO Auto-generated constructor stub
		key=next;
		value=next2;
	}

	public K getKey() {
		// TODO Auto-generated method stub
		return key;
	}

	public V getValue() {
		// TODO Auto-generated method stub
		return value;
	}

	public V setValue(V v) {
		// TODO Auto-generated method stub
		V result=value;//È«¾Ö±äÁ¿»á±äÀ¶£¬¹þ¹þ
		value=v;
		return result;
	}

	public static <K extends Comparable<? super K>, V> Comparator<Entry<K, V>> comparingByKey() {
		// TODO Auto-generated method stub
		return null;
	}

	public static <K, V extends Comparable<? super V>> Comparator<Entry<K, V>> comparingByValue() {
		// TODO Auto-generated method stub
		return null;
	}

	public static <K, V> Comparator<Entry<K, V>> comparingByKey(
			Comparator<? super K> cmp) {
		// TODO Auto-generated method stub
		return null;
	}

	public static <K, V> Comparator<Entry<K, V>> comparingByValue(
			Comparator<? super V> cmp) {
		// TODO Auto-generated method stub
		return null;
	}
	
	@Override
	public int hashCode() {
		// TODO Auto-generated method stub
		return (key==null? 0:key.hashCode())^(value==null?0:value.hashCode());
	}
	
	@Override
	public boolean equals(Object obj) {
		// TODO Auto-generated method stub
		if(!(obj instanceof MapEntry)){
			return false;
		}
		MapEntry me=(MapEntry) obj;
		return (key==null?me.getKey()==null:key.equals(me.getKey())) &&
				(value==null?
						me.getValue()==null:value.equals(me.getValue()));
	}

}