利用StringBuffer把数组拼接成一个字符串

package com.shujia.day11;

/*
    把数组拼接成一个字符串

 */
public class StringBufferDemo5 {
    public static void main(String[] args) {
        int[] arr = {11, 22, 33};

        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < arr.length; i++) {
            if (i == 0) {
                sb.append("[").append(arr[i]).append(",");
            } else if (i == arr.length - 1) {
                sb.append(arr[i]).append("]");
            } else {
                sb.append(arr[i]).append(",");
            }
        }

        String res = sb.toString();

        System.out.println(res);
    }
}