Java遍历输出Map

import java.util.*;

/**
 * @author PengHao
 * @date 2020-03-23 21:05
 */
public class PrintMap {
    private static void printMap1(Map<String, String> map) {
        System.out.println("\n方法一");
        Set<String> keySet = map.keySet();
        for (String key : keySet) {
            System.out.println(key + "    " + map.get(key));
        }
    }

    private static void printMap2(Map<String, String> map) {
        System.out.println("\n方法二");
        Set<Map.Entry<String, String>> entries = map.entrySet();
        Iterator<Map.Entry<String, String>> iterator = entries.iterator();
        while (iterator.hasNext()) {
            Map.Entry<String, String> next = iterator.next();
            System.out.println(next.getKey() + "    " + next.getValue());
        }
    }

    private static void printMap3(Map<String, String> map) {
        System.out.println("\n方法三");
        Set<Map.Entry<String, String>> entries = map.entrySet();
        for (Map.Entry<String, String> entry : entries) {
            System.out.println(entry.getKey() + "    " + entry.getValue());
        }
    }

    private static void printMap4(Map<String, String> map) {
        System.out.println("\n方法四");
        Collection<String> values = map.values();
        for (String value : values) {
            System.out.println(value);
        }
    }

    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>(3);
        map.put("周一", "Monday");
        map.put("周二", "Tuesday");
        map.put("周三", "Wednesday");
        printMap1(map);
        printMap2(map);
        printMap3(map);
        printMap4(map);
    }
}

方法一
周一    Monday
周二    Tuesday
周三    Wednesday

方法二
周一    Monday
周二    Tuesday
周三    Wednesday

方法三
周一    Monday
周二    Tuesday
周三    Wednesday

方法四
Monday
Tuesday
Wednesday