map的遍历方式

 1 Map<String,String> map = new HashMap<String,String>();
 2 map.put("shandong","jinan");
 3 map.put("shanxi","xian");
 4 map.put("jiangsu", "nanjing");
 5 System.out.println("Method 1");
 6 for(Map.Entry<String, String> entry:map.entrySet())
 7 {
 8     System.out.println(entry.getKey() + "----->" + entry.getValue());
 9 }
10 
11 Set set = map.entrySet();
12 Iterator it = set.iterator();
13 System.out.println("Method 2");
14 while(it.hasNext())
15 {
16     Map.Entry<String, String> entry1 = (Map.Entry<String, String>)it.next();
17     System.out.println(entry1.getKey() + "----->" + entry1.getValue());
18 }