Just playing around with lambdas

java_8_lambda.java

package org.dnorton.java8.example;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 */
public class LambdaTest {

    public static void main(String[] args) {
        List<Workout> workouts = new ArrayList<Workout>();
        workouts.add(new Workout(10, 60,"run"));
        workouts.add(new Workout(3, 19, "run"));
        workouts.add(new Workout(30, 120, "bike"));
        workouts.add(new Workout(2, 61, "swim"));

        workouts.forEach(System.out::println);

        workouts.stream().sorted((w1, w2) ->
            Integer.compare(w1.distance, w2.distance)).forEach(System.out::println);

        System.exit(0);

        Workout[] workoutArray = workouts.toArray(new Workout[workouts.size()]);

        // use lambda in place of Comparator implementation
        // sort by distance
        Arrays.sort(workoutArray, (w1, w2) ->
            Integer.compare(w1.distance, w2.distance)
        );

        for (Workout workout: workoutArray)
            System.out.println(workout);

        // sort by duration
        Arrays.sort(workoutArray, (w1, w2) ->
            Integer.compare(w1.duration, w2.duration));

        for (Workout workout: workoutArray)
            System.out.println(workout);


    }

}

class Workout {

    Workout(Integer distance, Integer duration, String type) {
        this.distance = distance;
        this.duration = duration;
        this.type = type;
    }

    Integer distance;
    Integer duration;
    String type;

    @Override
    public String toString() {
        return "Workout type: " + this.type + " distance: " + this.distance + " duration: " + this.duration;
    }
}