给定行号Java，将2D数组的行作为逗号分隔的字符串返回

Question

I'm attempting to create a function that will accept the row number of a multi-dimensional array as an integer and return a string that contains a comma-delimited list of the values in that row. this.desks is the 2d array containing string values. this.oneRow is a string that I would like the function to return. sb is a stringbuilder. Row is the value of the row that should be returned. This block of code is what I've managed to find but it returns the entire array. I've attempted to look at the syntax for string builder and modify it to no avail. Would someone mind assisting?

public String getRow(int row) {

    for(String[] s1 : this.desks) {
        this.sb.append(Arrays.toString(s1));
        this.oneRow = sb.toString();
       }
     return this.oneRow;

Answer 1

this.oneRow += sb.toString();

要连接的值。

Answer 2

You shouldn't be looping if you want the first row, use index row (after first checking it's a valid index). Like,

public String getRow(int row) {
    if (row < desks.length) {
        return Arrays.toString(desks[row]);
    }
    return ""; // <-- or null, or throw an exception.
}