Map合并

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最近工作中碰到了一个技术需求，需要将新获取的Map与之前的Map数据合并，两个Map中的数据的key值有重复。要想保持数据完整，就需要将其中一个Map重复的key值改变。经上网查询后，我发现改变的方案只有一种（我只找到一种），就是新建一个key-value对，然后再删除旧的key-value对。下面是我测试写的代码。

public class Test{       public HashMap test1(){        HashMap hm = new HashMap();        HashMap hm1 = new HashMap();        HashMap hm2 = new HashMap();        hm1.put("Java","222");        hm1.put("PHP","111");        hm1.put("C++","333");        hm2.put("Java","aaa");        hm2.put("PHP","bbb");        hm2.put("C++","ccc");        hm.put("0",hm1);        hm.put("1",hm2);        return hm;    }      public HashMap test(){        HashMap hm = new HashMap();        HashMap hm1 = new HashMap();        HashMap hm2 = new HashMap();        hm1.put("Java","aaa");        hm1.put("PHP","222");        hm1.put("C++","555");        hm2.put("Java","abc");        hm2.put("PHP","123");        hm2.put("C++","234");        hm.put("0",hm1);        hm.put("1",hm2);        return hm;    }    public static void main(String[] args){        Test test = new Test();        HashMap hm = test .test();        HashMap hm1 = test .test1();        for(int i = 0;i < hm1.size();i++){            hm1.put(String.valueOf(hm.size()+i),hm1.get(String.valueOf(i)));            hm1.remove(String.valueOf(i));        }        hm.putAll(hm1);        System.out.println("最终 hm-->"+hm);       }}

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