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