[JAVA] 54. Collection - ArrayList

1. 객체를 ArrayList에 저장

package ex13;

import java.util.ArrayList;

class Point {
    int x, y;

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public String toString() {
        return "(" + x + ", " + y + ")";
    }
}

public class ArraylistTest {
    public static void main(String[] args) {
        ArrayList<Point> list = new ArrayList<>();

        list.add(new Point(0, 0));
        list.add(new Point(4, 0));
        list.add(new Point(3, 5));
        list.add(new Point(-1, 3));
        list.add(new Point(13, 2));

        System.out.println(list.toString());
    }
}

2. 문자열을 ArrayList에 저장

package ex13;

import java.util.ArrayList;

public class ArraylistTest2 {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("Apple");
        list.add("Banana");
        list.add("Mango");
        list.add("Pear");
        list.add("Grape");

        int index = list.indexOf("Mango");
        System.out.println("Mango의 위치 : " + index);
    }
}