遍历Map的四种方法

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));

}

 

//方法四：

for (Iterator<Entry<Integer, Element>> iterator = mapElements.entrySet().iterator();
     iterator.hasNext(); ) {
    Map.Entry<Integer, Element> entry = iterator.next();

log.info("CSkey为：{}", entry.getKey());
log.info("CSvalue为：{}", entry.getValue());

}

}

 

}