数组扩容和缩减 java

import java.util.Scanner;
public class ArrayAdd02
{
	public static void main(String[] args)
	{
		Scanner myScanner = new Scanner(System.in);
		int array[]={1,2,3,4};
		do
		{
			int newArray [] = new int[array.length+1];

			for(int i=0;i <= array.length-1;i++)//赋值给新数组
			{
				newArray[i]=array[i];
			} 
			//添加新数
			System.out.println("添加新的元素为：");
			int addNum = myScanner.nextInt();
			newArray[newArray.length-1] = addNum;//添加的新数,放到最后面

			array = newArray;
			//不添加就退出
			System.out.println("还要添加元素吗？");
			String answer = myScanner.next();
			if(answer.equals("no"))
			{
				break;
			}

		}while(true);
		for ( int i=0;i<=array.length-1;i++ ) 
		{
			System.out.println("array"+i+"="+array[i]);
		}
	}
}




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import java.util.Scanner;
public class ArrayReduce
{
	public static void main(String[] args)
	{
		//定义一个数组
		int array[]={1,2,3,4,5};
		//创建一个新的数组，长度变短一个，
		//然后赋值给新的数组减掉一个的数组
		//剪完之后给原来的数组
		//问再减短吗 yes 减短
		Scanner myscanner = new Scanner (System.in);
		String answer ="";
		
		do
		{
			
			int newArray[] = new int[array.length-1];//长度减短,但不能一直减短最多只能减短到1
			for(int i =0;i<=newArray.length-1;i++)//赋值
			{
				newArray[i]= array[i];
			}
			array = newArray;//已经变短了
			
			//输出array
			for(int i = 0;i<=array.length-1;i++)
			{
				System.out.println("array["+i+"]="+array[i]);
			}
			//询问用户是否减短
			System.out.println("剪短吗？yes/no");
		    answer = myscanner.next();
			if(array.length==1||answer.equals("no")) break;
		}while(true);//回答减短
		
	}
}