删除不带字符串变量的结尾逗号Java? [英] Remove trailing comma Java without a string variable?

问题描述

public static void printGrid(int rows, int cols) {
    int totalNum = rows * cols;
    for (int i = 1; i <= rows; i++) {
        for (int k = 0; k < cols; k++) {
            System.out.print(i + rows * k + ", ");
        } System.out.println();      
    }
}

Outputs = 1, 4, 7, 10, 13, 16, 
          2, 5, 8, 11, 14, 17, 
          3, 6, 9, 12, 15, 18, 

我想用每行的最后一个数字删除尾随逗号，但是我没有变量作为保存它们的字符串，只是一个打印语句.有什么办法吗?

I want to remove the trailing commas by the last numbers in each line, but I do not have a variable as a string holding them, just a print statement. Is there any way to do this?

推荐答案

简单来说，仅在需要时才打印:

Simply, print it only when needed:

public static void printGrid(int rows, int cols) {
    int totalNum = rows * cols;
    for (int i = 1; i <= rows; i++) {
        for (int k = 0; k < cols; k++) {
            System.out.print(i + rows * k);
            if (k < cols - 1) System.out.print(", ");
        }
        System.out.println();      
    }
}

参数3、6的输出为:

1, 4, 7, 10, 13, 16
2, 5, 8, 11, 14, 17
3, 6, 9, 12, 15, 18

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