Rand.java

import java.util.Random;

public class Rand {
  public static void main (String[] args) {
    System.out.println("computing c = a/(b+a - 2)..");
    Random random = new Random(42);      // (1)

    int a = random.nextInt(2);           // (2)
    System.out.printf("a=%d\n", a);

    //... lots of code here

    int b = random.nextInt(3);           // (3)
    System.out.printf("  b=%d       ,a=%d\n", b, a);

    int c = a/(b+a -2);                  // (4)
    System.out.printf("=>  c=%d     , b=%d, a=%d\n", c, b, a);         
  }
}