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Submitted by: M S Sridhar(sridhar.ms@gmail.com)

Monday Jan 15th 2018 by M S Sridhar

Language: Java, Level: Intermediate: - Learn how to use the Random class available in the java.util package to generate random numbers.

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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