- 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
Java Program to generate random numbers with no duplicates
For random numbers in Java, create a Random class object −
Random randNum = new Random();
Now, create a HashSet to get only the unique elements i.e. no duplicates −
Set<Integer>set = new LinkedHashSet<Integer>();
Generate random numbers with Random class nextInt −
while (set.size() < 5) { set.add(randNum.nextInt(5)+1); }
Example
import java.util.LinkedHashSet; import java.util.Random; import java.util.Set; public class Demo { public static void main(final String[] args) throws Exception { Random randNum = new Random(); Set<Integer>set = new LinkedHashSet<Integer>(); while (set.size() < 5) { set.add(randNum.nextInt(5)+1); } System.out.println("Random numbers with no duplicates = "+set); } }
Output
Random numbers with no duplicates = [2, 4, 1, 3, 5]
Advertisements