Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Add all the elements from a collection to the HashSet in Java
First, set the collection −
String strArr[] = { "P", "Q", "R", "S" };Now, take a Set and add all the elements of the above collection using asList() method −
Set s = new HashSet(Arrays.asList(strArr));
The following is an example to add all elements from a collection to the HashSet −
Example
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
public class Demo {
public static void main(String[] a) {
String strArr[] = { "P", "Q", "R", "S" };
Set s = new HashSet(Arrays.asList(strArr));
strArr = new String[] { "R", "S", "T", "U" };
s.addAll(Arrays.asList(strArr));
strArr = new String[] { "S", "T", "U" };
s.addAll(Arrays.asList(strArr));
System.out.println(s);
}
}Output
[P, Q, R, S, T, U]
Updated on: 25-Jun-2020
341 Views
Advertisements