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Tip: Random Number Generation Using Java

Learn how to use the Random class available in the java.util package to generate random numbers.


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We can use the Random class available in the java.util package to generate random numbers. The code sample below demonstrates generation of a random number with an upper limit.

Listing 1. Random Number Generation

import java.util.*; 

class RandomNumberGenerator 
{ 
   public static void main (String args[]) 
   { 
      RandomNumberGenerator randomNumberGenerator = new RandomNumberGenerator();
      randomNumberGenerator.proceed();
   }
   
   private void proceed()
   {
      System.out.println("Enter the upper range for the random number: ");
      Scanner scanner = new Scanner(System.in);
      int maxRange = scanner.nextInt(); // Likely to throw java.util.InputMismatchException when incorrect inputs are provided. 
                                // There are similar methods to support other data types
      Random random = new Random(); 
      int randonInt = random.nextInt(maxRange); //Generate a randon number 0 to maxRange-1
      System.out.println(randonInt); 
   }
}

 

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Sridhar M S. is a Java developer from Bangalore, India. He holds a master's degree in Computer Science.
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