java - 将 parseInt 更改为 nextInt

Question

我有一些代码可以正常工作并且可以完成它应该做的事情。不幸的是，我只需要使用 nextInt(); 。有人知道该怎么做吗？

当前输入(来自文本文件):

3

4

2 3 6 7

4 5 6 7

2 2 2 2

当前输出:

Average score of each assignment:

Assignment #1 Average: 2.666666666

Assignment #2 Average: 3.333333333

Assignment #3 Average: 4.666666666

Assignment #4 Average: 5.333333333

import java.util.Scanner;
import java.io.File;  
import java.io.FileNotFoundException; 
import java.util.Arrays;

public class Scores {
  public static void main(String[] args) throws FileNotFoundException {
    Scanner keyboard = new Scanner(System.in);
    System.out.println("What is the name of the file containing the scores?");
    String fileName = keyboard.nextLine();
    Scanner fileScan = new Scanner(new File(fileName));

    //TODO: read in the values for the number of students and number of assignments using the Scanner on the file
    //TODO: create a 2-D to store all the scores and read them all in using the Scanner on the file
    int rows = Integer.parseInt(fileScan.nextLine());
    int columns = Integer.parseInt(fileScan.nextLine());

    int [][] myArray = new int[rows][columns];
      while(fileScan.hasNextLine()) {
         for (int i=0; i<myArray.length; i++) {
            String[] line = fileScan.nextLine().trim().split(" ");
            for (int j=0; j<line.length; j++) {
               myArray[i][j] = Integer.parseInt(line[j]);
            }
         }
      }
    System.out.println("Array of scores:");
    //TODO: print the entire array, row by row, using Arrays.toString()
    System.out.println(Arrays.deepToString(myArray).replace("], ", "]\n").replace("[[", "[").replace("]]", "]"));

    System.out.println("Average score of each assignment:");
    //TODO: compute and print the average on each assignment
    double total=0;
    int assignment=1;
        for(int i=0;i<myArray[0].length;i++) {
            for(int j=0;j<myArray.length;j++) {
                total+=myArray[j][i];          
            }
            System.out.println("Assignment #" + assignment++ + " Average = " + (total/3));
            total=0;
        }
    fileScan.close(); 
    keyboard.close();
  }
}

Answer 1

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Scanner;

public class Scores {

public static void main(String[] args) throws FileNotFoundException {
    Scanner keyboard = new Scanner(System.in);
    System.out.println("What is the name of the file containing the scores?");
    String fileName = keyboard.nextLine();
    Scanner fileScan = new Scanner(new File(fileName));

    //TODO: read in the values for the number of students and number of assignments using the Scanner on the file
    //TODO: create a 2-D to store all the scores and read them all in using the Scanner on the file
    int rows = fileScan.nextInt();
    int columns = fileScan.nextInt();

    int[][] myArray = new int[rows][columns];
    while (fileScan.hasNextLine()) {
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < columns; j++) {
                myArray[i][j] = fileScan.nextInt();
            }
            fileScan.nextLine();
        }
    }
    System.out.println("Array of scores:");
    //TODO: print the entire array, row by row, using Arrays.toString()
    System.out.println(Arrays.deepToString(myArray).replace("], ", "]\n").replace("[[", "[").replace("]]", "]"));

    System.out.println("Average score of each assignment:");
    //TODO: compute and print the average on each assignment
    double total = 0;
    int assignment = 1;
    for (int i = 0; i < myArray[0].length; i++) {
        for (int j = 0; j < myArray.length; j++) {
            total += myArray[j][i];
        }
        System.out.println("Assignment #" + assignment++ + " Average = " + (total / 3));
        total = 0;
    }
    fileScan.close();
    keyboard.close();
}
}