Question

USE JAVA

Write a static generic method PairUtil.minmax that computes the minimum and maximum elements of an array of type T and returns a pair containing the minimum and maximum value. Require that the array elements implement the Measurable interface of Chapter 10.

Answer 1

import javafx.util.Pair;

public class PairUtil {

    public static <T extends Measurable> Pair<T, T> minmax(T[] arr) {
        T min = arr[0], max = arr[0];
        for (int i = 0; i < arr.length; i++) {
            if (arr[i].getMeasure() > max.getMeasure()) {
                max = arr[i];
            }
            if (arr[i].getMeasure() < min.getMeasure()) {
                min = arr[i];
            }
        }
        return new Pair<>(min, max);
    }

    public static void main(String[] args) {
        Measurable[] arr = {
                new Measurable() {
                    @Override
                    public double getMeasure() {
                        return 10;
                    }
                },
                new Measurable() {
                    @Override
                    public double getMeasure() {
                        return 2;
                    }
                },
                new Measurable() {
                    @Override
                    public double getMeasure() {
                        return 7;
                    }
                },
                new Measurable() {
                    @Override
                    public double getMeasure() {
                        return 9;
                    }
                },
        };
        Pair<Measurable, Measurable> pair = minmax(arr);
        System.out.println("Min: " + pair.getKey().getMeasure());
        System.out.println("Max: " + pair.getValue().getMeasure());
    }
}