HashMap实现同键值累加

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如何用hashmap对一个集合实现相同的键，值累加，而非替换？

解决方法如下：

HashMap map =new HashMap();

if(循环取出aa bb的值)

{

String aa="获得aa的值"；

String bb="获得bb的值"；

if(map.containsKey(aa))//判断集合里是否有aa键

{

map.put(aa,map.get(aa)+bb);//map.get()方法取出对应键的值

}

else//否则在map中添加新键值

{

map.put(aa,bb);

}

}

//遍历map

Set entries = map.entrySet();
Iterator iter = entries.iterator();
while(iter.hasNext())
{
Map.Entry entry = (Map.Entry)iter.next();
String key = entry.getKey();//得到键
String value = entry.getValue();//得到值
}