1. Map<String, Integer> tempMap = new HashMap<String, Integer>();
2. tempMap.put("a","12");
3. tempMap.put("b","34");
4. tempMap.put("c","56");
5. // JDK1.4中
6. // 遍歷方法一 hashmap entrySet() 遍歷
7. Iterator it = tempMap.entrySet().iterator();
8. while (it.hasNext()) {
   1. 　　Map.Entry entry = (Map.Entry) it.next();
   2. Object key = entry.getKey();
   3. 　　Object value = entry.getValue();
   4. 　　System.out.println("key=" + key + " value=" + value);
9. }
10. System.out.println("");
11. // JDK1.5中,應用新特性For-Each循環
12. // 遍歷方法二
13. for (Map.Entry<String, Integer> entry : tempMap.entrySet()) {
    1. 　　 String key = entry.getKey().toString();
    2. 　　String value = entry.getValue().toString();
    3. 　　 System.out.println("key=" + key + " value=" + value);
14. }
15. System.out.println("");
16. // 遍歷方法三 hashmap keySet() 遍歷
17. for (Iterator i = tempMap.keySet().iterator(); i.hasNext();) {
18. Object obj = i.next();
19. System.out.println(obj);// 循環輸出key
20. System.out.println("key=" + obj + " value=" + tempMap.get(obj));
21. }
22. for (Iterator i = tempMap.values().iterator(); i.hasNext();) {
23. Object obj = i.next();
24. System.out.println(obj);// 循環輸出value
25. }
26. // 遍歷方法四 treemap keySet()遍歷
27. for (Object o : tempMap.keySet()) {
28. System.out.println("key=" + o + " value=" + tempMap.get(o));
29. }
30. System.out.println("11111");
31. // java如何遍歷Map <String, ArrayList> map = new HashMap <String,
32. // ArrayList>();
33. System.out.println("java 遍歷Map <String, ArrayList> map = new HashMap<String, ArrayList>();");
34. Map<String, ArrayList> map = new HashMap<String, ArrayList>();
35. Set<String> keys = map.keySet();
36. Iterator<String> iterator = keys.iterator();
37. while (iterator.hasNext()) {
38. String key = iterator.next();
39. ArrayList arrayList = map.get(key);
40. for (Object o : arrayList) {
41. System.out.println(o);
42. }
43. }
44. Map<String, List> map = new HashMap<String, List>();
45. for (Map.Entry entry : map.entrySet()) {
46. String key = entry.getKey().toString();
47. List<String> list= (List) entry.getValue();
48. for (String value : list) {
49. System.out.println(key + "====" + value);
50. }
51. }

map的5種遍歷方式