8일차 ArrayList

package com.myPackage;

import java.util.ArrayList;

public class PackageStudy {
	
	public static void main(String[] args) {
		
		String[] names={"하나","둘","셋"};
		int[] ages={1,2,3,4,5};
		
		ArrayList list =new ArrayList();
		
		//자동 완성기능  : Ctrl+SpaceBar 
		list.add("하나"); 
		list.add("둘");
		list.add("셋");
		list.add(4);
		list.add(5.55f);
		list.add("여섯");
		
		System.out.println(list.get(1));
		                 //list.get(1) - Returns the element 
		                 //              at the specified position in this list.
		System.out.println(names[1]);
		
		for(int i=0;i<names.length;i++){
			System.out.println(names[i]);
		}
		System.out.println("====");
		for(int i=0;i<list.size();i++){
			System.out.println(list.get(i));
		}
		
		//while사용해서 표현해 보세요
		System.out.println("====");
		
		int i=0;
		while(i<list.size()){ //조건은 true/false
			System.out.println(list.get(i));
			i++;
		}
		System.out.println("====");
		
		int k=7;
		/* k의 크기만큼 (ArrayList에서는 의미가 없음)
		 * 배열List을 만듭니다.
		 * (0) - 7   (1)- 14  (2) - 21  (3)- 28
		 * (4) - 35 (5) - 42  (6) 49
		 * for문이나 while문으로 배열의 값을 
		 * 위처럼 넣으세요   */
		
		
		ArrayList listK=new ArrayList();
		
		for(i=0;i<=6;i++){
			listK.add((i+1)*7);
			System.out.println(listK.get(i));
		}
	}
}