Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.*;
import java.util.function.Predicate;

public class Main {

    public static void main(String... args) {

        List<Box> inventory = Arrays.asList(new Box(80, "green"), new Box(155, "green"), new Box(120, "red"));

        List<Box> greenApples = filter(inventory, Main::isGreenApple);
        System.out.println(greenApples);

        List<Box> heavyApples = filter(inventory, Main::isHeavyApple);
        System.out.println(heavyApples);

        List<Box> greenApples2 = filter(inventory, (Box a) -> "green".equals(a.getColor()));
        System.out.println(greenApples2);

        List<Box> heavyApples2 = filter(inventory, (Box a) -> a.getWeight() > 150);
        System.out.println(heavyApples2);

        List<Box> weirdApples = filter(inventory, (Box a) -> a.getWeight() < 80 || "brown".equals(a.getColor()));
        System.out.println(weirdApples);
    }

    public static boolean isGreenApple(Box apple) {
        return "green".equals(apple.getColor());
    }

    public static boolean isHeavyApple(Box apple) {
        return apple.getWeight() > 150;
    }

    public static List<Box> filter(List<Box> inventory, Predicate<Box> p) {
        List<Box> result = new ArrayList<>();
        for (Box apple : inventory) {
            if (p.test(apple)) {
                result.add(apple);
            }
        }
        return result;
    }

}

class Box {
    private int weight = 0;
    private String color = "";

    public Box(int weight, String color) {
        this.weight = weight;
        this.color = color;
    }

    public Integer getWeight() {
        return weight;
    }

    public void setWeight(Integer weight) {
        this.weight = weight;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String toString() {
        return "Apple{" + "color='" + color + '\'' + ", weight=" + weight + '}';
    }
}