遍历map和删除map中的一个entry

public static void main(String[] args) {
        Map<Integer,Integer> map = new HashMap<Integer,Integer>();
         map.put(33, 333);
         map.put(22, 222);
         map.put(11, 111);
        for(Map.Entry<Integer, Integer> entry:map.entrySet()){
            System.out.println("key:"+entry.getKey()+" value:"+entry.getValue());
            
        }
        
        
    }

public static void main(String[] args) {
        Map<Integer,Integer> map = new HashMap<Integer,Integer>();
         map.put(33, 333);
         map.put(22, 222);
         map.put(11, 111);
         List<Integer> list = new ArrayList<>();
        for(Integer key : map.keySet()){
            System.out.println("key:"+ key);
            list.add(key);
        }
        System.out.println(list);
        
        
    }

public static void main(String[] args) {
        Map<Integer,Integer> map = new HashMap<Integer,Integer>();
         map.put(33, 333);
         map.put(22, 222);
         map.put(11, 111);
         
         List<Integer> list = new ArrayList<>();
         for(Integer value : map.values()){
             System.out.println("value:"+value);
             list.add(value);
         }
        System.out.println(list);
        
    }

public static void main(String[] args) {
        Map<Integer,Integer> map = new HashMap<Integer,Integer>();
         map.put(33, 333);
         map.put(22, 222);
         map.put(11, 111);
         Iterator<Map.Entry<Integer,Integer>> entries = map.entrySet().iterator();
        while(entries.hasNext()){
            Map.Entry<Integer, Integer> entry = entries.next();
            System.out.println("key:"+ entry.getKey()+" value:"+entry.getValue());
        }
    }

public static void main(String[] args) {
        Map<Integer,Integer> map = new HashMap<Integer,Integer>();
         map.put(33, 333);
         map.put(22, 222);
         map.put(11, 111);
         Iterator<Map.Entry<Integer,Integer>> entries = map.entrySet().iterator();
        while(entries.hasNext()){
            Map.Entry<Integer, Integer> entry = entries.next();
            if(entry.getKey().equals(22)){
                entries.remove();
            }
            //在entries的remove之前entries.next()已经把下一个给了entry
            //就是删除22前，已经把22给了entry
            //再打印entry时，22已经在entry了
            //但是现在entries里已经没有22了
            System.out.println("key:"+ entry.getKey()+" value:"+entry.getValue());
        }
        System.out.println("这时打印***********");
        //再打印entries,就已经没有22了
        Iterator<Map.Entry<Integer,Integer>> entries2 = map.entrySet().iterator();
        while(entries2.hasNext()){
            Map.Entry<Integer, Integer> entry = entries2.next();
            System.out.println("key:"+ entry.getKey()+" value:"+entry.getValue());
        }
        
    }