@@ -0,0 +1,452 @@
+package org.jiumao.common.domain;%0A%0Apublic class Pair%3CK,V%3E %7B%0A    private K key;%0A    private V value;%0A%0A    public Pair(K key, V value) %7B%0A        super();%0A        this.key = key;%0A        this.value = value;%0A    %7D%0A%0A    public K getKey() %7B%0A        return key;%0A    %7D%0A%0A    public void setKey(K key) %7B%0A        this.key = key;%0A    %7D%0A%0A    public V getValue() %7B%0A        return value;%0A    %7D%0A%0A    public void setValue(V value) %7B%0A        this.value = value;%0A    %7D%0A%0A%7D

add k-v datastructe