Java - map 遍历方式

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package com.execute.demo;import java.util.HashMap;import java.util.Iterator;import java.util.Map;/** * Created with IntelliJ IDEA by zhouk. */public class MapTraversal {    public static void main(String[] args) {        Map<String, String> map = new HashMap<String, String>();        map.put("Java", "Bruce Eckel");        map.put("Spring", "Craig Walls");        map.put("JavaScript", "Nicholas C.Zakas");        // method 1        for (String key : map.keySet()) {            System.out.println("key: " + key + ", value: " + map.get(key));        }        // mothod 2        for (String value : map.values()) {            System.out.println("value: " + value);        }        // method 3        Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator();        while (iterator.hasNext()) {            Map.Entry<String, String> entry = iterator.next();            System.out.println("key: " + entry.getKey() + ", value: " + entry.getValue());        }        // method 4        for (Map.Entry<String, String> entry : map.entrySet()) {            System.out.println("key: " + entry.getKey() + ", value: " + entry.getValue());        }    }}
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