遍历Map

以前

  for (Iterator i = tempMap.keySet().iterator(); i.hasNext();) {
    Object obj = i.next();
    System.out.println(obj);// 循环输出key
    System.out.println("key=" + obj + " value=" + tempMap.get(obj));
  } 

JDK 1.4

  Iterator it = tempMap.entrySet().iterator();
  while (it.hasNext()) {
    Map.Entry entry = (Map.Entry) it.next();
    Object key = entry.getKey();
    Object value = entry.getValue();
    System.out.println("key=" + key + " value=" + value);
  } 

JDK 1.5

    Map<String,String> map = new HashMap<String,String>();  
    for(Map.Entry<String, String> entry : map.entrySet()){  
        String value = entry.getValue();  
        String key = entry.getKey();  
    }