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Program: How to copy all elements from HashSet to an array?


Description:

Below example shows how to copy all elements from HashSet to an array. By calling toArray() method and passing existing array object to this method, we can copy all elements of HashSet to an array.


Code:
package com.java2novice.hashset;

import java.util.HashSet;

public class MyHashSetToArray {

	public static void main(String a[]){
		HashSet<String> hs = new HashSet<String>();
		//add elements to HashSet
		hs.add("first");
		hs.add("second");
		hs.add("third");
		System.out.println("HashSet content: ");
		System.out.println(hs);
		String[] strArr = new String[hs.size()];
		hs.toArray(strArr);
		System.out.println("Copied array content:");
		for(String str:strArr){
			System.out.println(str);
		}
	}
}

Output:
HashSet content: 
[second, third, first]
Copied array content:
second
third
first
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List Of All HashSet Sample Programs:

  1. Basic HashSet Operations.
  2. How to iterate through HashSet?
  3. How to copy Set content to another HashSet?
  4. How to delete all elements from HashSet?
  5. How to copy all elements from HashSet to an array?
  6. How to compare two sets and retain elements which are same on both sets?
  7. How to eliminate duplicate user defined objects from HashSet?
  8. How to find user defined objects from HashSet?
  9. How to delete user defined objects from HashSet?
Knowledge Centre
Java class can be private?
We can not declare top level class as private. Java allows only public and default modifier for top level classes in java. Inner classes can be private.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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