1 public class Emp {
2 private String e_id;
3 private String e_name;
4
5 public Emp(String e_id, String e_name) {
6 this.e_id = e_id;
7 this.e_name = e_name;
8 }
9
10 public String getE_id() {
11 return e_id;
12 }
13
14 public void setE_id(String e_id) {
15 this.e_id = e_id;
16 }
17
18 public String getE_name() {
19 return e_name;
20 }
21
22 public void setE_name(String e_name) {
23 this.e_name = e_name;
24 }
25
26 }
1 import java.util.*;
2
3 public class MapText {
4
5 public static void main(String[] args) {
6 Map<String,String> map = new HashMap<>();
7 Emp emp = new Emp("001", "張三");
8 Emp emp1 = new Emp("002", "李四");
9 Emp emp2 = new Emp("005", "王五");
10 Emp emp3 = new Emp("006", "馬六");
11 map.put(emp.getE_id(), emp.getE_name());
12 map.put(emp1.getE_id(), emp1.getE_name());
13 map.put(emp2.getE_id(), emp2.getE_name());
14 map.put(emp3.getE_id(), emp3.getE_name());
15
16 System.out.println("HashMap類實現的map集合，無序：");
17 for (String str : map.keySet()) {
18 System.out.println(str + ":" + map.get(str));
19 }
20 System.out.println("HashMap類實現的map集合，有序：");
21 TreeMap<String,String> tmap = new TreeMap<>();
22 tmap.putAll(map);
23 for (String str : tmap.keySet()) {
24 System.out.println(str + ":" + tmap.get(str));
25 }
26
27 map.remove("005");
28 System.out.println(map);
29 tmap.remove("005");
30 System.out.println(tmap);
31 }
32
33 }
運行：
