删除map中的元素

Map<String,String> map = new HashMap<String,String> ();

map.put("1", "a");

map.put("2", "b");

map.put("3", "c");

Iterator iterator = map.keySet().iterator();

while (iterator.hasNext()) {

String key = (String) iterator.next();

if ("1".equals(key) || "2".equals(key)) {

iterator.remove(); //添加该行代码

}

}

System.out.println(map.get("1"));

System.out.println(map.get("2"));

System.out.println(map.get("3"));