Java.util.function.DoublePredicate interface in Java with Examples

// Java example to demonstrate DoublePredicate interface

import java.util.function.DoublePredicate;

public class DoublePredicateDemo {
    public static void main(String[] args)
    {
        // DoublePredicate to check square
        // of x is less than 100
        DoublePredicate db
            = (x) -> { return x * x < 100.0; };
        System.out.println("100 is less than 100 "
                           + db.test(10));

        DoublePredicate db3;
        // Test condition reversed
        db.negate();
        System.out.println("100 is greater than 100 "
                           + db.test(10));

        DoublePredicate db2 = (x) ->
        {
            double y = x * x;
            return y >= 36 && y < 1000;
        };

        // Test condition ANDed
        // with another predicate
        db3 = db.and(db2);
        System.out.println("81 is less than 100 "
                           + db3.test(9));

        db3 = db.or(db2);
        // Test condition ORed with another predicate
        System.out.println("49 is greater than 36"
                           + " and less than 100 "
                           + db3.test(7));
    }
}