利用HashSet去重

 1 package com.test;
 2 
 3 public class Person {
 4 
 5     private String id;
 6     private String name;
 7 
 8     public String getId() {
 9         return id;
10     }
11 
12     public void setId(String id) {
13         this.id = id;
14     }
15 
16     public String getName() {
17         return name;
18     }
19 
20     public void setName(String name) {
21         this.name = name;
22     }
23 
24     @Override
25     public int hashCode() {
26         int result;
27         result = (name == null ? 0 : name.hashCode());
28         result = 37 * result + (id == null ? 0 : id.hashCode());
29         return result;
30     }
31 
32     @Override
33     public boolean equals(Object obj) {
34         if (this == obj) {
35             return true;
36         }
37         if (!(obj instanceof Person)) {
38             return false;
39         }
40         final Person other = (Person) obj;
41         if (this.id.equals(other.getId()) && this.name.equals(other.getName())) {
42             return true;
43         } else {
44             return false;
45         }
46     }
47 
48 }

 

 

 

 

 1 package com.test;
 2 
 3 import java.util.HashSet;
 4 import java.util.Iterator;
 5 
 6 public class HashSetTest {
 7     public static void main(String[] args){
 8         Person person1 = new Person();
 9         Person person2 = new Person();
10         Person person3 = new Person();
11         
12         person1.setId("1");
13         person1.setName("test1");
14         person2.setId("1");
15         person2.setName("test1");
16         person3.setId("2");
17         person3.setName("test1");
18         
19         HashSet set = new HashSet();
20         set.add(person1);
21         set.add(person2);
22         set.add(person3);
23         
24         System.out.println(set.size());
25         
26         Iterator iter = set.iterator();
27         while(iter.hasNext()){
28             Person temp = (Person)iter.next();
29             System.out.println(temp.getId() + ":" + temp.getName());
30         }
31         
32         
33     }
34 }