Remove specified element from Java HashSet example

1.Basic java example program to remove element hashset

• boolean remove(Object o) .   This method is used to remove element from hashset if it is present it returns true.

1. package com.getSizehashset;
2.  
3. import java.util.HashSet;
4. import java.util.Iterator;
5.  
6. public class HashsetExample{
7.  
8. public static void main(String[] args) {
9.   
10. //create object of HashSet
11.  HashSet<Integer> hashSet = new HashSet();
12.        
13.  //add elements to HashSet object
14.  hashSet.add(1);
15.  hashSet.add(2);
16.  hashSet.add(3);
17.  hashSet.add(4);
18.  hashSet.add(5);
19.  hashSet.add(6);
20.  hashSet.add(7);
21.  hashSet.add(8);
22.  
23. System.out.println("Size of HashSet after addition : " + hashSet.size());
24.  
25. System.out.println("Hashset contains");
26.  
27. Iterator it=hashSet.iterator();
28.              
29. while(it.hasNext()){
30. System.out.println(it.next());
31.                      
32. }   
33.  
34. boolean isRemoved = hashSet.remove(6);
35. System.out.println("Was 6 removed from HashSet ? " + isRemoved );
36.  
37. System.out.println("HashSet after removal : " + hashSet);
38. }
39.  
40. }
     

Output:

1. Size of HashSet after addition
2. 8
3. hashset contains
4. 1
5. 2
6. 3
7. 4
8. 5 
9. 6
10. 7
11. 8
12. Was 6 removed from HashSet ?true
13. HashSet after removal : [1, 2, 3, 4,5,7,8]