Is there a method like the rng.randint() in the code below for Java? 
Are Math.random() o java.util.Random viable for this aim?
  ...  
  rng.seed(random_seed)
  child1, child2 = parents
  const1 = child1.const_set
  const2 = child2.const_set
  cp1 = rng.randint(1, len(const1) - 1) if len(const1) > 1 else 0
  cp2 = rng.randint(1, len(const2) - 1) if len(const2) > 1 else 0
 
    