public class IntPred implements Predicate
{
  int i;

  public IntPred(int j) { i = j; } // constructor

  public boolean predicate(Object b)
  {
    if (b instanceof Integer)
      { 
	int k = ((Integer)b).intValue();
	return (i == k);
      }
    else 
      {
	throw new RuntimeException("Bad predicate test");
      }
  }
} /* IntPred is a Predicate, and has a method called predicate
     that takes an object and delivers true or false.
     The constructor IntPred(3) delivers a test "is the object 3?"
     and can be thought of as something similar to a partially applicable
     function. Do a search on Currying if you want to know more */