package ch10.collection;

import java.util.ArrayList;

public class Ex02 {
	public static void main(String[] args) {
		ArrayList<Integer> list=new ArrayList<Integer>();
		list.add(10);
		list.add(20);
		list.add(30);
		list.add(40);
		System.out.println(list.toString());
		
		ArrayList<Float> arr=new ArrayList<Float>();
		arr.add(55.5f);
		arr.add(66.6f);
		arr.add(77.f);
		System.out.println(arr.toString());
		
		//추가
		list.add(55);
		arr.add(88.8f);
		System.out.println(list.toString());
		System.out.println(arr.toString()+"\\n\\n");
		
		//삭제
		list.remove(4);
		System.out.println(list.toString());
		
		//자바에서 사용하는 모든 클래스는 Object를 상속받는다.(모든 클래스의 최상위 클래스)
		ArrayList<Object> arrList=new ArrayList<Object>();
		arrList.add(10);
		arrList.add(55.5f);
		arrList.add("apple");
		System.out.println(arrList.toString());
		
		for(int i=0;i<arrList.size();i++) {
			Object obj=arrList.get(i);
			System.out.print(obj.toString()+" " );
		}
	}

}

[10, 20, 30, 40]
[55.5, 66.6, 77.0]
[10, 20, 30, 40, 55]
[55.5, 66.6, 77.0, 88.8]

[10, 20, 30, 40]
[10, 55.5, apple]
10 55.5 apple