java用程序实现subString功能，javasubstring

java用程序实现subString功能，javasubstring

import java.util.Scanner;
public class Cut
{
	public static void main(String[] args)
	{
	    /*实现的功能是SubString（截取一段字符串）注意一个中文字符是两个字节
		*/
		String[] aa = {"j","f","p","o","明明","j","f","[","p","q","j","f","p","0"};
		System.out.println("请输入要截取的起点");
		Scanner src = new Scanner(System.in);
		int start = src.nextInt();
		System.out.println("请输入要截取的终点");
		int stop = src.nextInt();
		String result = "";
		System.out.println("aa数组长度为" + aa.length);
		if(stop < aa.length && start < aa.length)
		{
		for(int i = start; i < stop ; i++ )
		  {
			 result +=aa[i];
		  }
		}
		else{
			System.out.println("您输入的长度有错误，请重新输入");
		}
		System.out.println(result);
	}
}