Loops 对角递增 if（shape.equals（“对角线”））{ 对于（int row=0；row

尝试替换

        if (shape.equals("diagonal")){
                    for (int row = 0; row <= size; row ++){
                        for (int col = 0 ; col < size; col ++ ){

                            if ( col % 4 == 0 ){
                                System.out.print("*");
                            } else {
                                System.out.print("$");
                            }
                        }
                        System.out.println();
                    }
                }



*$$$*$$$*$$$*$$$*
$*$$$*$$$*$$$*$$$
$$*$$$*$$$*$$$*$$
same as it go down

与

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根本不清楚你在问什么

if (col % 4 == 0 )

if ( (col+row)%4 == 0 )