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方法一：在for循环中遍历value
Map<String, String> map = new HashMap(); map.put("开发", "开发"); map.put("测试",
"测试"); for (Object value : map.values()) { System.out.println("第一种:" + value); }
方法二:：通过key遍历
for (String key: map.keySet()) { System.out.println("第二种:" + map.get(key)); }
方法三:：通过entrySet实现遍历
Set<Map.Entry<String, String>> entrySet = map.entrySet(); for (Map.Entry
entry : entrySet) { System.out.println("第三种:" + entry.getKey() + " ：" +
entry.getValue()); }
方法四:：通过Iterator迭代器实现遍历
Iterator<Map.Entry<String, String>> entryIterator =
map.entrySet().iterator(); while (entryIterator.hasNext()) { Map.Entry<String,
String> entry = entryIterator.next(); System.out.println("第四种:" +
entry.getKey() + " ：" + entry.getValue()); }
方法五 ：通过lambda表达式进行遍历
map.forEach((key, value) -> { System.out.println("第五种:" + key + " ：" +
value); });
