String_project/StringBuilder_module/src/StringBuilder_package/case2_Splice_string.java

package StringBuilder_package;

public class case2_Splice_string {
    public static void main(String[] args) {
        //1、定义数组
        int[] arr = {1, 2, 3};

        //2、调用方法把数组变成字符串
        String str = arrToString(arr);

        System.out.println(str);
    }

    public static String arrToString(int[] arr) {
        StringBuilder sb = new StringBuilder();
        sb.append("[");

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

        return sb.toString();
    }
}