java怎么让字符串里重复中的唯一一个字符改变

比如我有一字符串"0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0"
如何让其中唯一一个零改变,比如我只要第一个0变成1,然后又再次输入整个字符串"1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0"
,这样该如何写代码. 求助.. 求助..先谢谢了.  Java Eclipse 编程 --------------------编程问答-------------------- 字符串格式固定是 *,*,* 这样的吗？ --------------------编程问答--------------------

import java.util.Scanner;



public class Test {



	public static void main(String[] args) {



		int index = 0;

		String str = "0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0";

		String[] s = str.split(",");

		System.out.print("请输入要改的数的下标：");

		Scanner sc = new Scanner(System.in);

		index = sc.nextInt();

		StringBuffer sb = new StringBuffer();

		for (int i = 0; i < s.length; i++) {

			if (index == i) {

				s[i] = "1";

			}

			sb.append(s[i] + ",");

		}

		System.out.println(sb.deleteCharAt(sb.length()-1).toString());

	}

}

--------------------编程问答--------------------

引用 1 楼 a470577391 的回复:

字符串格式固定是 *,*,* 这样的吗？

嗯. 对的. 只要改变某一个唯一的0 --------------------编程问答--------------------

引用 3 楼 u011663567 的回复:

Quote: 引用 1 楼 a470577391 的回复:

字符串格式固定是 *,*,* 这样的吗？

嗯. 对的. 只要改变某一个唯一的0

那楼上写的那个就可以了

补充：Java ,  Eclipse