Changing spacing between values in 2D array-CodePudding

import java.util.*;
import java.io.*;

public class GradeBook
{

    public static void main(String[] args) 
    {
        System.out.println("Starting program\n\n");
        String[] STUDENT_NAMES = new String[] {"Adams", "Baker", "Campbell", "Dewey", "East"};
        int[][] STUDENT_GRADES = new int[5][3];
        
        loadGradeArray(STUDENT_GRADES);
        
        for (int i = 0; i < STUDENT_NAMES.length; i  ) 
        {
            System.out.printf("%s %d %d \n", STUDENT_NAMES[i], STUDENT_GRADES[i][0], STUDENT_GRADES[i][1]);
        }
            
        
    } //end main
    
    public static void loadGradeArray(int[][] STUDENT_GRADES)
    {
        for(int row = 0; row<STUDENT_GRADES.length; row  )
        {
            for(int col = 0; col<STUDENT_GRADES[row].length; col  )
            {
                STUDENT_GRADES[0][0] = 75;
                STUDENT_GRADES[0][1] = 75;
                STUDENT_GRADES[1][0] = 100;
                STUDENT_GRADES[1][1] = 75;
                STUDENT_GRADES[2][0] = 84;
                STUDENT_GRADES[2][1] = 75;
                STUDENT_GRADES[3][0] = 80;
                STUDENT_GRADES[3][1] = 75;
                STUDENT_GRADES[4][0] = 50;
                STUDENT_GRADES[4][1] = 75;
            }
        }
    }
}

Assignment for class has me creating a grade book for five students with two exam grades listed by their name. The finished product gives the user the option of either printing the average grade for a student, or printing the class average for a test

I am having trouble with formatting the spacing between the values in the grade book. I want the numbers to be evenly aligned-right, like this:

Adams _______75 75 

Baker _______100 75 

Campbell _____84 75 

Dewey _______80 75 

East _________50 75

Ignore the '_'. Not sure how to format that

CodePudding user response：

Use the below code to print the data

System.out.printf("%-10s %d %d \n", STUDENT_NAMES[i], STUDENT_GRADES[i][0], STUDENT_GRADES[i][1]);

Check the full code and output here

public class GradeBook
{

    public static void main(String[] args)
    {
        System.out.println("Starting program\n\n");
        String[] STUDENT_NAMES = new String[] {"Adams", "Baker", "Campbell", "Dewey", "East"};
        int[][] STUDENT_GRADES = new int[5][3];

        loadGradeArray(STUDENT_GRADES);

        for (int i = 0; i < STUDENT_NAMES.length; i  )
        {
            System.out.printf("%-10s %d %d \n", STUDENT_NAMES[i], STUDENT_GRADES[i][0], STUDENT_GRADES[i][1]);
        }


    } //end main

    public static void loadGradeArray(int[][] STUDENT_GRADES)
    {
        for(int row = 0; row<STUDENT_GRADES.length; row  )
        {
            for(int col = 0; col<STUDENT_GRADES[row].length; col  )
            {
                STUDENT_GRADES[0][0] = 75;
                STUDENT_GRADES[0][1] = 75;
                STUDENT_GRADES[1][0] = 100;
                STUDENT_GRADES[1][1] = 75;
                STUDENT_GRADES[2][0] = 84;
                STUDENT_GRADES[2][1] = 75;
                STUDENT_GRADES[3][0] = 80;
                STUDENT_GRADES[3][1] = 75;
                STUDENT_GRADES[4][0] = 50;
                STUDENT_GRADES[4][1] = 75;
            }
        }
    }
}

Output

Adams      75 75 
Baker      100 75 
Campbell   84 75 
Dewey      80 75 
East       50 75

CodePudding user response：

Something like this will keep everything in a nice, even, columnar format:

String[] STUDENT_NAMES = new String[]{"Adams", "Baker", "Campbell", "Dewey", "East"};
int[][] STUDENT_GRADES = new int[5][3];

loadGradeArray(STUDENT_GRADES);

String header = String.format("%-10s %7s %8s", "Name", "Class-1", "Class-2");
String underline = String.join("", java.util.Collections.nCopies(header.length(), "-"));
System.out.println(underline);
System.out.println(header);
System.out.println(underline);
    
for (int i = 0; i < STUDENT_NAMES.length; i  ) {
    System.out.printf("%-10s ]