[JAVA] Collections - ArrayList

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

public class Main {
    public static void main(String[] args) {
        List<Integer> integerList = new ArrayList<>();
        integerList.add(1);
        integerList.add(5);
        integerList.add(4);
        integerList.add(9);

        System.out.println(integerList);

        Collections.sort(integerList);  //sort시켜줌
        System.out.println(integerList);
        System.out.println(integerList.size());

        integerList.remove(3);
        System.out.println(integerList);

        for(int i = 0; i < integerList.size(); i++){
            System.out.println(integerList.get(i));
        }
        System.out.println("****");
        for(int current : integerList){
            System.out.println(current);
        }
    }
}