map基本遍历方法

map的基本遍历方法

1. Map map = new HashMap();
2. map.put(1, 1);
3. map.put("1","2");
4. //第一种遍历方式
5. Set set = map.keySet();
6. Iterator iter = set.iterator();
7. while(iter.hasNext()){
8. Object obj = map.get(iter.next());
9. System.out.println(obj);
10. }
11. //第二种遍历方式
12. Set set1 = map.entrySet();
13. Iterator iter1 = set1.iterator();
14. while(iter1.hasNext()){
15. Map.Entry<Object, Object> mapEntry = (Entry<Object, Object>) iter1.next();
16. Object key = mapEntry.getKey();
17. Object value = mapEntry.getValue();
18. System.out.println(key);
19. System.out.println(value);