java实现元组Tuple类

package core;

public class Tuple<K,V>  {
	private K key;
	private V value;
	
	public Tuple(K key, V value) {
		this.key = key;
		this.value = value;
	}
	
	public K getKey() {
		return key;
	}

	public V getValue() {
		return value;
	}
	
	public String toString() {
		return key.toString() + ":" + value.toString();
	}
}