- Map<String, String> map = new HashMap<String, String>();
- map.put("key1", "value1");
- map.put("key2", "value2");
- map.put("key3", "value3");
- //第一种:普遍使用,二次取值
- System.out.println("通过Map.keySet遍历key和value:");
- for (String key : map.keySet()) {
- System.out.println("key= "+ key + " and value= " + map.get(key));
- }
- //第二种
- System.out.println("通过Map.entrySet使用iterator遍历key和value:");
- Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
- while (it.hasNext()) {
- Map.Entry<String, String> entry = it.next();
- System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
- }
- <span style="color:#FF0000;"> //第三种:推荐,尤其是容量大时</span>
- System.out.println("通过Map.entrySet遍历key和value");
- for (Map.Entry<String, String> entry : map.entrySet()) {
- System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
- }
- //第四种
- System.out.println("通过Map.values()遍历所有的value,但不能遍历key");
- for (String v : map.values()) {
- System.out.println("value= " + v);
- }
转载: https://blog.csdn.net/h378588270/article/details/23271733
原文地址:https://www.cnblogs.com/huameitang/p/8707458.html
时间: 2024-11-08 21:32:24