[Java] 다중 정렬

아래와 같은 코드로 price에 대해 먼저 정렬하고 같은 price 내에서 name으로 다시 정렬.

package exercise;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class MultiConditionSort {
    public static void main(String[] args) {
        List<Item> items = new ArrayList<>();
        items.add(new Item(20, "c"));
        items.add(new Item(15, "z"));
        items.add(new Item(11, "a"));
        items.add(new Item(19, "b"));
        items.add(new Item(20, "b"));
        items.add(new Item(10, "z"));
        items.add(new Item(20, "a"));
        items.add(new Item(10, "x"));
        items.add(new Item(30, "b"));

        System.out.println("Origin: " + items);

        Collections.sort(items, new Comparator<Item>() {
            @Override
            public int compare(Item o1, Item o2) {
                if (o1.price < o2.price) return -1;
                if (o1.price > o2.price) return 1;

                if (o1.name.compareTo(o2.name) < 0) return -1;
                if (o1.name.compareTo(o2.name) > 0) return 1;

                return 0;
            }
        });

        System.out.println("Sorted: " + items);
    }
}

class Item {
    int price;
    String name;

    public Item(int price, String name) {
        this.price = price;
        this.name = name;
    }

    @Override
    public String toString() {
        return "[" + price + ", " + name + "]";
    }
}