Java 数组拼接字符串方法 - 将数组元素用符号连接

public static String joinArray(int[] arr) { StringBuilder sb = new StringBuilder(); sb.append('['); for (int i = 0; i < arr.length; i++) { sb.append(arr[i]); if (i != arr.length - 1) { sb.append('#'); } } sb.append(']'); return sb.toString(); }

//测试 int[] arr = {1, 2, 3}; System.out.println(joinArray(arr)); //输出：[1#2#3]