java遍历Map集合

public static void main(String[] args) throws IOException {        Map<String, Object> map = new HashMap<String, Object>();        map.put("key1", "value1");        map.put("key2", "value2");        map.put("key3", "value3");        map.put("key4", "value4");        map.put("key5", "value5");        // 遍历map 方法1        Set<String> keySet = map.keySet();        for (String key : keySet) {            String value = map.get(key).toString();            System.out.println(key + "==" + value);        }        System.out.println("==========================================");        // 遍历map 方法2        Iterator<String> iterator = map.keySet().iterator();        while (iterator.hasNext()) {            String key = (String) iterator.next();  //获取key            String value = map.get(key).toString(); //获取value            System.out.println(key + "==" + value);        }    }