我如何使用二维数组

Question

I constructed (poorly) a two dimensional array to hold student names and the grades. It does prompt me for the names of students equal to the amount that i want, but it dosn't for grades. Also it states that i have a index out of bounds, which i dont see how that happened.

private void studentArray() {
            int rows = 0;
            int col = 0;

            Scanner input = new Scanner(System.in);

            System.out.println("How many students do you have?");
            rows = input.nextInt();

            System.out.println("How many tests would you like to record?");
            col = input.nextInt();

           String [][] schoolArray =  new String[rows][col];

           for (int row = 0; row < rows; row++ ){
            System.out.println("Please enter student name.");
            schoolArray[row][0] = input.next();
                for(int cols = 1; cols < col; cols++){
                System.out.println("Please enter grades.");
                schoolArray[cols][0] = input.next();
                }//end of col for loop
        }//end of row for loop
           printSchool (schoolArray, rows, col);


        }//end of studentArray

        private void printSchool(String[][]schoolArray, int rows, int col){
            for ( int row = 0; row < schoolArray.length; row ++) {
                System.out.print(schoolArray[rows][col + 1] + "\t");
            }
        }

Answer 1

我认为您是误将其写成school[cols][0] ，应该是在col for loop里面是school[row][cols]

Answer 2

First use-

schoolArray[row][cols] = input.next(); 

instead of

schoolArray[cols][0] = input.next(); 

and also change the printSchool method-

 private void printSchool(String[][]schoolArray, int rows, int col){
                for ( int row = 0; row < rows; row ++) {
                       System.out.print("\n");
                       for(int cols= 0; cols < col ;cols++){

                    System.out.print(schoolArray[row][cols] + "\t");
                  }
                }
            }