集合list里存储list，要遍历最底层list的对象元素的遍历方法

Posted 2020-06-11

 1 package com.wtd;
 2 
 3 import java.util.ArrayList;
 4 import java.util.HashSet;
 5 import java.util.Iterator;
 6 import java.util.List;
 7 import java.util.Set;
 8 
 9 public class L16 {
10 
11     /**
12      * @desc 需要将list传到另个方法里怎么用list遍历userList和dpList？
13      * @param args
14      * @throws Exception 
15      */
16     public static void main(String[] args) throws Exception {
17         // TODO Auto-generated method stub
18         List list = new ArrayList<ArrayList>();
19         User user= new User();
20         user.setAge(18);
21         user.setName("andi");
22         Department department= new Department();
23         department.setDepartId(7);
24         department.setDepartName("Program");
25         List<User> userList = new ArrayList();//用于接收从数据库查出的数据
26         userList.add(user);
27         List<Department> dpList = new ArrayList();//用于接收从数据库查出的数据
28         dpList.add(department);
29         list.add(userList);
30         list.add(dpList);
31         getElement(list);
32     }
33     public static void getElement(List list) throws Exception{
34         for (Iterator iterator = list.iterator(); iterator.hasNext();) {
35             ArrayList listSmall = (ArrayList) iterator.next();
36             for (Iterator iterator2 = listSmall.iterator(); iterator2.hasNext();) {
37                 Object objectSmall= iterator2.next();
38                 String className = objectSmall.getClass().getName();
39                 if ("com.wtd.User".equalsIgnoreCase(className)) {//com.wtd.User
40                     System.out.println("className.user="+className);
41                     User userSmall= (User) objectSmall; 
42                     System.out.println("user.name:"+userSmall.getName()+"\\r\\nuser.age:"+userSmall.getAge());
43                 }else if ("com.wtd.Department".equalsIgnoreCase(className)) {
44                     System.out.println("className.department="+className);//com.wtd.Department
45                     Department departmentSmall= (Department) objectSmall;
46                     System.out.println("department.departname:"+departmentSmall.getDepartName()+"\\r\\ndepartment.departid:"+departmentSmall.getDepartId());
47                 }
48                 
49             }
50             
51         }
52         
53     }
54 
55 }
56 
57 class User{
58     int age;
59     String name;
60     public int getAge() {
61         return age;
62     }
63     public void setAge(int age) {
64         this.age = age;
65     }
66     public String getName() {
67         return name;
68     }
69     public void setName(String name) {
70         this.name = name;
71     }
72     
73 }
74 
75 class Department{
76     int departId;
77     String departName;
78     public int getDepartId() {
79         return departId;
80     }
81     public void setDepartId(int departId) {
82         this.departId = departId;
83     }
84     public String getDepartName() {
85         return departName;
86     }
87     public void setDepartName(String departName) {
88         this.departName = departName;
89     }
90     
91 }

解决此URL提出的问题：http://q.cnblogs.com/q/79494/