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

hashset java Collections interview Questions

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

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

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