1 import java.util.*;
2
3 class Name
4 {
5 private String firstName,lastName;
6
7 public String getFirstName() {
8 return firstName;
9 }
10
11 public void setFirstName(String firstName) {
12 this.firstName = firstName;
13 }
14
15 public String getLastName() {
16 return lastName;
17 }
18
19 public void setLastName(String lastName) {
20 this.lastName = lastName;
21 }
22 public Name(String firstName,String lastName)
23 {
24 this.firstName=firstName;
25 this.lastName=lastName;
26 }
27 public boolean equals(Object obj)
28 {
29 if (obj instanceof Name)
30 {
31 Name name=(Name)obj;
32 return (firstName.equals(name.firstName)) && (lastName.equals(name.lastName));
33 }
34
35 return super.equals(obj);
36 }
37 public int hashCode()
38 {
39 return firstName.hashCode();
40 }
41 public String toString() { return firstName + " " + lastName; }
42
43 }
44
45
46
47 public class testmy1 {
48
49 public static void main(String[] args)
50 {
51 Collection c = new HashSet();
52 c.add(new Name("f1","l1"));
53 c.add(new Name("f2","l2"));
54 c.add(new Name("f3","l3"));
55 c.add(new Name("f33","l33"));
56
57 Iterator i=c.iterator();
58 while (i.hasNext())
59 {
60 Name n=(Name)i.next();
61 System.out.print(n.getFirstName()+" ");
62 }
63
64 i=c.iterator();
65 while (i.hasNext())
66 {
67 Name n=(Name)i.next();
68 if (n.getFirstName().length()==3)
69 {
70 i.remove();
71 }
72 }
73 System.out.println(c);
74 }
75
76 }
