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Random Number Generator in Java

To generate random numbers in Java, use.

import java.util.Random;

Now, use the Random class to create an object.

Random num = new Random();

Now, use this in a loop.nextInt()method, as it is used to get the next random integer value. You can also set a range, such as 0 to20, written as.

nextInt( 20);

Let's see a complete example where the range is1to10.

Example

import java.util.Random;
public class Demo {
   public static void main(String args[]) {
      Random num = new Random();
      int res;
      for (int i = 1; i <= 5; i++ ) {
         res = 1 + num.nextInt( 10 );
         System.out.printf("%d", res);
      }
   }
}

Output Result

4 5 9 6 9