java_HashMap的遍历方法_4种

        HashMap<String,String> map = new HashMap<>();
        map.put("bb","12");
        map.put("aa","13");
        for(String each:map.keySet()){
            System.out.println("key:"+each+"value:"+map.get(each));
        }    

for(Map.Entry<String,String> each:map.entrySet()){
            System.out.println("key:"+each.getKey()+" value:"+each.getValue());
        }

Iterator test01 = map.entrySet().iterator();
        while(test01.hasNext()){
            System.out.println(test01.next());
        }

for(String each:map.values()){
            System.out.println(each);
        }