java 数组扩容

韩顺平老师视频作业，

要求：实现动态的给数组添加元素效果，实现对数组扩容。例

import java.util.Scanner;
public class ArrayAdd{
	public static void main(String[] args){
		//数组扩容
		Scanner input = new Scanner(System.in);
		int[] arr = {1,2,3};
		boolean add = false;
		do{
			//int num =arr.length+1;
			int[] arrNew = new int[arr.length+1];
			for(int i = 0;i < arr.length;i++){
				arrNew[i] = arr[i];
				//int num = i+1;
			}
			System.out.print("请输入数组arr要添加的数据：");
			arrNew[arrNew.length-1] = input.nextInt();
			arr = arrNew;
			System.out.println("数组arr扩容后的值是：");
			for(int i = 0;i < arr.length;i++){
				System.out.print(arr[i]+"  ");
				}
			System.out.println("n添加成功，是否继续添加y/n");
			char continuance = input.next().charAt(0);
			if(continuance == 'y' || continuance == 'Y'){
				add = true;
			}else if(continuance == 'n' || continuance == 'N'){
				add = false;
			}else{
				System.out.println("输入错误，结束输入");
				add = false;
			}
		}while(add);
	}
}