1. 
   
2. <DIV class=blockcode>
   
3. <BLOCKQUOTE>
   
4. <P>import java.util.*;
   
5. import java.util.Map.Entry;
   
6. public class DemoExtend{
   
7. public static void main(String[] args){
   
8. strlist();
   
9. System.out.println("*********************");
   
10. strmap();
    
11. }
    
12. 
    
13. //一对多Map集合。HashMap中嵌套HashMap。
    
14. public static void strmap(){
    
15. HashMap<String,HashMap<String,String>> DH=new HashMap<String,HashMap<String,String>>();
    
16. HashMap<String,String> base=new HashMap<String,String>();
    
17. HashMap<String,String> jiuye=new HashMap<String,String>();
    
18. //信息录入
    
19. base.put("02", "lisi");
    
20. base.put("01", "zhangsan");
    
21. 
    
22. jiuye.put("01", "zhangba");
    
23. jiuye.put("02", "liqi");
    
24. //建立关系
    
25. DH.put("base", base);
    
26. DH.put("jiuye", jiuye);
    
27. 
    
28. //迭代器嵌套输出。
    
29. /*Iterator<String> I=DH.keySet().iterator();
    
30. while(I.hasNext()){
    
31. String room=I.next();
    
32. Iterator<String> i=DH.get(room).keySet().iterator();
    
33. while(i.hasNext()){
    
34. String id=i.next();
    
35. String name=DH.get(room).get(id);
    
36. System.out.println(id+"...."+name);
    
37. }
    
38. 
    
39. }*/</P>
    
40. <P> </P>
    
41. <P>//此处，我想用Map.Entry来实现嵌套输出</P>
    
42. <P>//可是遇到了问题。
    
43. //Set<Map.Entry<String, HashMap<String, String>>> test=DH.entrySet();
    
44. //Iterator<Entry<String, HashMap>>=test.iterator();
    
45. Iterator<Map.Entry<String, HashMap<String, String>>> I=DH.entrySet().iterator();
    
46. //****************************************************************************************
    
47. 
    
48. 
    
49. 
    
50. 
    
51. }
    
52. //HashMap中嵌套list
    
53. public static void strlist(){
    
54. //建立学校集合
    
55. HashMap<String,List<stu>> HD=new HashMap<String,List<stu>>();
    
56. List<stu> base=new ArrayList<stu>();
    
57. List<stu> admin=new ArrayList<stu>();
    
58. 
    
59. base.add(new stu("01","zhangsan"));
    
60. base.add(new stu("02","liusan"));
    
61. 
    
62. admin.add(new stu("02","liusan"));
    
63. admin.add(new stu("01","zhangli"));
    
64. //建立关系
    
65. HD.put("预热班", base);
    
66. HD.put("就业班", admin);
    
67. /*
    
68. Iterator<String> I=HD.keySet().iterator();
    
69. while(I.hasNext()){
    
70. //获取，学校中的键，也就是，班级的名字
    
71. String room=I.next();
    
72. //搭建list迭代器
    
73. Iterator<stu> i=HD.get(room).iterator();
    
74. while(i.hasNext()){
    
75. stu student=i.next();
    
76. System.out.println(student.getxn());
    
77. }
    
78. }*/
    
79. }
    
80. 
    
81. }
    
82. 
    
83. //学生类
    
84. class stu{
    
85. private String xuehao;
    
86. private String name;
    
87. stu(String xuehao,String name){
    
88. this.xuehao=xuehao;
    
89. this.name=name;
    
90. }
    
91. public String getxn(){
    
92. return xuehao+":"+name;
    
93. }
    
94. 
    
95. }
    
96. 
    
97. 
    
98. 
    
99. </P>

复制代码

问题：请提供一个用Map.Entry嵌套while循环的信息输出？有劳

1. 
   
2. <DIV class=blockcode>
   
3. <BLOCKQUOTE>
   
4. <P>import java.util.*;
   
5. import java.util.Map.Entry;
   
6. public class DemoExtend{
   
7. public static void main(String[] args){
   
8. strlist();
   
9. System.out.println("*********************");
   
10. strmap();
    
11. }
    
12. 
    
13. //一对多Map集合。HashMap中嵌套HashMap。
    
14. public static void strmap(){
    
15. HashMap<String,HashMap<String,String>> DH=new HashMap<String,HashMap<String,String>>();
    
16. HashMap<String,String> base=new HashMap<String,String>();
    
17. HashMap<String,String> jiuye=new HashMap<String,String>();
    
18. //信息录入
    
19. base.put("02", "lisi");
    
20. base.put("01", "zhangsan");
    
21. 
    
22. jiuye.put("01", "zhangba");
    
23. jiuye.put("02", "liqi");
    
24. //建立关系
    
25. DH.put("base", base);
    
26. DH.put("jiuye", jiuye);
    
27. 
    
28. //迭代器嵌套输出。
    
29. /*Iterator<String> I=DH.keySet().iterator();
    
30. while(I.hasNext()){
    
31. String room=I.next();
    
32. Iterator<String> i=DH.get(room).keySet().iterator();
    
33. while(i.hasNext()){
    
34. String id=i.next();
    
35. String name=DH.get(room).get(id);
    
36. System.out.println(id+"...."+name);
    
37. }
    
38. 
    
39. }*/</P>
    
40. <P> </P>
    
41. <P>//此处，我想用Map.Entry来实现嵌套输出</P>
    
42. <P>//可是遇到了问题。
    
43. //Set<Map.Entry<String, HashMap<String, String>>> test=DH.entrySet();
    
44. //Iterator<Entry<String, HashMap>>=test.iterator();
    
45. Iterator<Map.Entry<String, HashMap<String, String>>> I=DH.entrySet().iterator();
    
46. //****************************************************************************************
    
47. 
    
48. 
    
49. 
    
50. 
    
51. }
    
52. //HashMap中嵌套list
    
53. public static void strlist(){
    
54. //建立学校集合
    
55. HashMap<String,List<stu>> HD=new HashMap<String,List<stu>>();
    
56. List<stu> base=new ArrayList<stu>();
    
57. List<stu> admin=new ArrayList<stu>();
    
58. 
    
59. base.add(new stu("01","zhangsan"));
    
60. base.add(new stu("02","liusan"));
    
61. 
    
62. admin.add(new stu("02","liusan"));
    
63. admin.add(new stu("01","zhangli"));
    
64. //建立关系
    
65. HD.put("预热班", base);
    
66. HD.put("就业班", admin);
    
67. /*
    
68. Iterator<String> I=HD.keySet().iterator();
    
69. while(I.hasNext()){
    
70. //获取，学校中的键，也就是，班级的名字
    
71. String room=I.next();
    
72. //搭建list迭代器
    
73. Iterator<stu> i=HD.get(room).iterator();
    
74. while(i.hasNext()){
    
75. stu student=i.next();
    
76. System.out.println(student.getxn());
    
77. }
    
78. }*/
    
79. }
    
80. 
    
81. }
    
82. 
    
83. //学生类
    
84. class stu{
    
85. private String xuehao;
    
86. private String name;
    
87. stu(String xuehao,String name){
    
88. this.xuehao=xuehao;
    
89. this.name=name;
    
90. }
    
91. public String getxn(){
    
92. return xuehao+":"+name;
    
93. }
    
94. 
    
95. }
    
96. 
    
97. 
    
98. 
    
99. </P>

复制代码

问题：请提供一个用Map.Entry嵌套while循环的信息输出？有劳