class Ideone {
    public static void main(String[] args) {
        final Relation<Integer, Integer> isLarger = (x, y) -> x < y;
        final Relation<Integer, Integer> isSmallerOrEqual = isLarger.negate();
        System.out.println(isLarger.test(1, 2));
        System.out.println(isSmallerOrEqual.test(1, 2));
    }
}
 
interface Relation<X,Y> {
 
    boolean test(X x, Y y);
 
    default Relation<X,Y> negate() {
        return (x, y) -> !this.test(x, y);
    }
}

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