import java.util.Random;
import java.lang.Math;        // to get Math.abs(), used in Random2.nextInt

/* Random2
 * A class like Random,
 * but with a method int nextInt( int low, int high)
 */
class Random2 extends Random {

  // randBetween( low, high )
  // return an int between low and high, inclusive.
  //
  public int nextInt( int low, int high ) {
    if (high < low)
      throw new RuntimeException(
                  "Random2.nextInt: Need low <= high, but low,high="
                  + low + "," + high );

    // nextInt() just returns an int between 
    // Integer.MIN_VALUE and Integer.MAX_VALUE, inclusive.
    return ( Math.abs( nextInt() ) % (high - low + 1)) + low;
    }




  // Random2.main()
  // Test the Random2.nextInt( int, int ) routine.
  //
  static public void main( String[] args ) {
    int iterations = 10, upper = 3, lower = -2;
    Random2 r = new Random2();

    System.out.println( "Here are " + iterations + " random ints between "
                        + lower + " and " + upper + " inclusive." );
    for ( int i = 0;  i < iterations; i++ )
      System.out.print( r.nextInt( lower, upper ) + ", " );
    System.out.println();
    
    System.out.print( "A random bit string: " );
    for ( int i = 0;  i < iterations; i++ )
      System.out.print( r.nextInt( 0, 1 ) );
    System.out.println();

    System.out.println( "Here's 23: " + r.nextInt( 23, 23 ) );

    System.out.println( "\nNow, time for an exception!" );
    r.nextInt( 100, 99 );
    }

  }