java遍历map几种简单方法

Posted 2020-10-28

public class test {

public static void main(String[] args) {

Map<String,Object> map = new HashMap<String,Object>();

map.put("test1","test1");

map.put("test2","test2");

map.put("test3","test3");

map.put("test4","test4");

map.put("test5","test5");

               // 方法一、

for(String key : map.keySet()){

System.out.println("遍历map.keySet():"+map.get(key));

}

//方法二、

for(Map.Entry<String,Object> m:map.entrySet()){

String value = (String) m.getValue();

System.out.println("使用Map.Entry<String,Object>:"+value);

}

//方法三

Iterator<String> iterator = map.keySet().iterator();

while(iterator.hasNext()){

String key = iterator.next();

System.out.println("使用iterator:"+map.get(key));

}

}

}

执行结果如下