用容器存儲表格數據

瞭解ORM思想，爲之後操做表數據提早打下基礎

表格模板

|---表格數據存儲_map和list結合存儲整張表
|------表格數據存儲_Map和_List結合
|--------每一行數使用一個Map；整個表格使用一個List
ORM思想：對象關係映射

 1 package boom.collection;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Collections;
 5 import java.util.HashMap;
 6 import java.util.Iterator;
 7 import java.util.List;
 8 import java.util.Map;
 9 import java.util.Set;
10 
11 /**
12  * 測試用容器表格數據的存儲
13  * @author Administrator
14  *
15  */
16 public class TestStoreData {
17 
18     public static void main(String[] args) {
19         
20         Map<String, Object> row1 = new HashMap<>();
21         
22         row1.put("id", "1001");
23         row1.put("姓名", "張三");
24         row1.put("薪水", "20000");
25         row1.put("入職日期", "2018.9.6");
26         
27         Map<String, Object> row2 = new HashMap<>();
28         row2.put("id", "1002");
29         row2.put("姓名", "李四");
30         row2.put("薪水", "5000");
31         row2.put("入職日期", "2019.5.9");
32         
33         Map<String, Object> row3 = new HashMap<>();
34         row3.put("id", "1003");
35         row3.put("姓名", "王五");
36         row3.put("薪水", "30000");
37         row3.put("入職日期", "2010.8.3");
38         
39         List<Map<String, Object>> table1 = new ArrayList<>();
40         table1.add(row1);
41         table1.add(row2);
42         table1.add(row3);
43         for (Map<String, Object> row : table1) {
44             Set<String> keyset = row.keySet();
45             for (String key : keyset) {
46                 System.out.print(key + ":" + row.get(key) + "\t");
47             }
48             System.out.println();
49         }
50     }
51 
52 }

|----表格數據存儲_javabean和list結合存儲整張表
|------每一行數據使用一個：javabean對象；整個表格用一個Map / List
用戶類：javabean

 1 /**
 2  * 完整的javabean[setter和getter方法，無參構造器]
 3 */
 4 class User{
 5     private int id;
 6     private String name;
 7     private double salary;
 8     private String data;
 9 
10     public User() {
11     }
12 
13     public User(int id, String name, double salary, String data) {
14         super();
15         this.id = id;
16         this.name = name;
17         this.salary = salary;
18         this.data = data;
19     }
20 
21     public int getId() {
22         return id;
23     }
24 
25     public void setId(int id) {
26         this.id = id;
27     }
28 
29     public String getName() {
30         return name;
31     }
32 
33     public void setName(String name) {
34         this.name = name;
35     }
36 
37     public double getSalary() {
38         return salary;
39     }
40 
41     public void setSalary(double salary) {
42         this.salary = salary;
43     }
44 
45     public String getData() {
46         return data;
47     }
48 
49     public void setData(String data) {
50         this.data = data;
51     }
52     @Override
53     public String toString() {
54         return "id:" + id + "  name:" + name + "  salary:" + salary + "  data:" + data;
55     }
56 }

測試類：

 1 User user1 = new User(1001, "張三", 50000, "2018.2.5");
 2 User user2 = new User(1002, "李四", 18000, "2018.9.5");
 3 User user3 = new User(1003, "王五", 15000, "2018.5.5");
 4 
 5 List<User> list = new ArrayList<>();
 6 list.add(user1);
 7 list.add(user2);
 8 list.add(user3);
 9 
10 for (User u : list) {
11     System.out.println(u);
12 }
13 
14 System.out.println("------------------------------------------------");
15 
16 Map<Integer, User> map = new HashMap<>();
17 map.put(1001, user1);
18 map.put(1002, user2);
19 map.put(1003, user3);
20 Set<Integer> keyset = map.keySet();
21 for (Integer key : keyset) {
22     System.out.println(key + ":" + map.get(key));
23 }

效果圖：