[JAVA] 객체 비교

class ComparableFruit implements Comparable<ComparableFruit> {
    private String name;
    private int price;
    
    public ComparableFruit(String name, int price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }
 
    @Override
    public int compareTo(ComparableFruit compareFruit) {
        
        //this가 먼저 앞에 있으면 ASC 비교할 대상이 먼저 앞에 잇으면 DESC 

        //return this.price - compareFruit.price; 
        return compareFruit.price - this.price;
    }
}

 Fruit[] fruits = new Fruit[6];
    fruits[0] = new Fruit("kiwi", 100);
    fruits[1] = new Fruit("mango", 300);
    fruits[2] = new Fruit("pineapple", 500);
    fruits[3] = new Fruit("grape", 700);
    fruits[4] = new Fruit("banana", 400);
    fruits[5] = new Fruit("apple", 200);

    for(int i = 0; i < fruits.length; i++) {
        System.out.print(fruits[i].getName() + " ");
    }

    System.out.println();

    Arrays.sort(fruits, new Comparator<Fruit>() {
        @Override
        public int compare(Fruit o1, Fruit o2) {
            String o1Name = o1.getName().toUpperCase();
            String o2Name = o2.getName().toUpperCase();

            return o1Name.compareTo(o2Name);
        }
    });

    for(int i = 0; i < fruits.length; i++) {
        System.out.print(fruits[i].getName() + " ");
    }