Map 使用中一点知识

public static void main(String [] args){


TjEnvironmentObj obj = new TjEnvironmentObj();

Map<Integer,TjEnvironmentObj> map = new HashMap<Integer,TjEnvironmentObj>();

obj.setGsmIndoorNum(11);

map.put(1, obj);

obj.setGsmIndoorNum(33);

Iterator<Integer> iter = map.keySet().iterator();

while(iter.hasNext()){

TjEnvironmentObj obj1 = map.get(iter.next());

System.out.println(obj1.getGsmIndoorNum());

}
}

结果：33

map  根据KEY 保存一次后，改变value的值后不再需要再PUT一次VALUE值既可以发生改变