Introduction to Programming

Chain two Predicate<T>

The Supplier interface does not have default methods, while the Predicate interface has one static method, isEqual(Object targetRef), and three default methods: and(Predicate other), negate(), and or(Predicate other). To demonstrate usage of the and(Predicate other) and or(Predicate other) methods, for example, let's write the methods that create two Predicate<Double> functions. One function checks whether the value is smaller than the input:

Predicate<Double> testSmallerThan(double limit){  Predicate<Double> func = new Predicate<Double>() {    public boolean test(Double num) {      System.out.println("Test if " + num + " is smaller than " + limit);      return num < limit;    }  };  return func;}

Another function checks whether the value ...