你知道几种遍历map的方式？

public static void test1(){
        Iterator<Map.Entry<String,String>> iterator = map.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry<String , String > entry = iterator.next();
            String  key = entry.getKey();
            String  value = entry.getValue();
            System.out.println(key);
            System.out.println(key+":"+value);
        }
    }

public static void test2(){
        for (Map.Entry<String,String> entry : map.entrySet()) {
            String  key = entry.getKey();
            String  value = entry.getValue();
            System.out.println(key);
            System.out.println(key+":"+value);
        }
    }

 public static void test3(){
        for (String key : map.keySet()) {
            System.out.println(key);
        }
    }

public static void test4(){
        for (String value : map.values()) {
            System.out.println(value);
        }
    }

static Map<String , String > map = new HashMap<>();
    public static void main(String[] args) {
        map.put("name","张三");
        map.put("age","21");
        map.put("sex","男");
        System.out.println("使用迭代器遍历map的键值对结果如下所示:");
        test1();
        System.out.println("使用for-each循环遍历Map的键值对:");
        test2();
        System.out.println("只遍历Map的键结果如下所示:");
        test3();
        System.out.println("只遍历Map的值结果如下所示:");
        test4();
    }

使用迭代器遍历map的键值对结果如下所示:
sex
sex:男
name
name:张三
age
age:21
使用for-each循环遍历Map的键值对:
sex
sex:男
name
name:张三
age
age:21
只遍历Map的键结果如下所示:
sex
name
age
只遍历Map的值结果如下所示:
男
张三
21