Java8InAction/src/main/java/lambdasinaction/chap3/Sorting.java at master · java8/Java8InAction · GitHub

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package lambdasinaction.chap3;

import java.util.*;

import static java.util.Comparator.comparing;

public class Sorting {

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

// 1

List<Apple> inventory = new ArrayList<>();

inventory.addAll(Arrays.asList(new Apple(80,"green"), new Apple(155, "green"), new Apple(120, "red")));

// [Apple{color='green', weight=80}, Apple{color='red', weight=120}, Apple{color='green', weight=155}]

inventory.sort(new AppleComparator());

System.out.println(inventory);

// reshuffling things a little

inventory.set(1, new Apple(30, "green"));

// 2

// [Apple{color='green', weight=30}, Apple{color='green', weight=80}, Apple{color='green', weight=155}]

inventory.sort(new Comparator<Apple>() {

public int compare(Apple a1, Apple a2){

return a1.getWeight().compareTo(a2.getWeight());

}});

System.out.println(inventory);

// reshuffling things a little

inventory.set(1, new Apple(20, "red"));

// 3

// [Apple{color='red', weight=20}, Apple{color='green', weight=30}, Apple{color='green', weight=155}]

inventory.sort((a1, a2) -> a1.getWeight().compareTo(a2.getWeight()));

System.out.println(inventory);

// reshuffling things a little

inventory.set(1, new Apple(10, "red"));

// 4

// [Apple{color='red', weight=10}, Apple{color='red', weight=20}, Apple{color='green', weight=155}]

inventory.sort(comparing(Apple::getWeight));

System.out.println(inventory);

}

public static class Apple {

private Integer weight = 0;

private String color = "";

public Apple(Integer 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 +

'}';

}

static class AppleComparator implements Comparator<Apple> {

public int compare(Apple a1, Apple a2){

return a1.getWeight().compareTo(a2.getWeight());

}

Java8InAction/src/main/java/lambdasinaction/chap3/Sorting.java at master · java8/Java8InAction · GitHub

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