本文实例分析了java遍历Map的几种方法。分享给大家供大家参考,具体如下:
Java代码:
1
2
3
4
5
|
Map<String,String> map= new HashMap<String,String>(); map.put( "username" , "qq" ); map.put( "passWord" , "123" ); map.put( "userID" , "1" ); map.put( "email" , "qq@qq.com" ); |
第一种用for循环
Java代码:
1
2
3
4
|
for (Map.Entry<String, String> entry:map.entrySet()) { System.out.println(entry.getKey()+ "--->" +entry.getValue()); } |
第二种用迭代
Java代码:
1
2
3
4
5
6
|
Set set = map.entrySet(); Iterator i = set.iterator(); while (i.hasNext()){ Map.Entry<String, String> entry1=(Map.Entry<String, String>)i.next(); System.out.println(entry1.getKey()+ "==" +entry1.getValue()); } |
用keySet()迭代
Java代码:
1
2
3
4
5
6
7
8
9
|
Iterator it=map.keySet().iterator(); while (it.hasNext()) { String key; String value; key=it.next().toString(); value=map.get(key); System.out.println(key+ "--" +value); } |
用entrySet()迭代
Java代码:
1
2
3
4
5
6
7
8
9
10
|
Iterator it=map.entrySet().iterator(); System.out.println( map.entrySet().size()); String key; String value; while (it.hasNext()){ Map.Entry entry = (Map.Entry)it.next(); key=entry.getKey().toString(); value=entry.getValue().toString(); System.out.println(key+ "====" +value); } |
希望本文所述对大家java程序设计有所帮助。