Java program to Copy all elements of Java HashSet to an Object Array

1.Basic java example program to Copy all elements of Java HashSet to an Object Array

• Object[] toArray()   This method is used To copy all elements of java HashSet object into array use

1. package com.copyelementhashset;
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.      
20. Object[] objArray = hashSet.toArray();
21.  
22. //display contents of Object array
23. System.out.println("HashSet elements are copied into an Array. Now Array Contains..");
24.  
25.  for(int index=0; index < objArray.length ; index++)
26.   System.out.println(objArray[index]);
27. 
    
28.  
29. System.out.println("Hashset contains");
30.  
31. Iterator it=hashSet.iterator();
32.              
33. while(it.hasNext()){
34. System.out.println(it.next());
35.                      
36. }   
37.  
38. }
39.  
40. }
     

Output:

1. HashSet elements are copied into an Array. Now Array Contains..
2. 1
3. 2
4. 3
5. 4
6. 5
7. Hashset contains
8. 1
9. 2
10. 3
11. 4
12. 5