Java中遍历Map对象的几种方法

Java中遍历Map对象的几种方法

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

for(Map.Entry<String, String> str:map.entrySet()) {
     System.out.println(str.getValue() + " "+ str.getKey());
 }

for(String key:map.keySet()) {
      System.out.println(key);
 }

 for(String value:map.values()) {
     System.out.println(value);
 }