我如何使用二维数组

Question

我构造了（很差）一个二维数组来容纳学生的姓名和成绩。 它的确提示我输入的学生姓名等于我想要的数量，但不要求成绩。 它还指出我有一个超出范围的索引，我不知道那是怎么发生的。

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

首次使用-

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

代替

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

并更改printSchool方法-

 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");
                  }
                }
            }