How to print a table of arrays?

Question

I\'m here to see if anyone would be able to help out with the problem.

I\'m trying to print a table out which would look something like this

Answer 1

Because of the variable nature of the columns, I would calculate the "required width" of each column as well. This would be used to "pad" shorter columns to ensure that the columns line up...

This would allow to increase the number of people and the size of there salaries without needing any additional compensation...

public class SalaryColumns {

    public static void main(String[] args) {

        int people = 20;
        int month = 12;

        String monthLabel = "Month #";
        String personLabel = "Person #";

        Random r = new Random(System.currentTimeMillis());
        int[][] table = new int[people][month];

        int[] columWidths = new int[month + 1];
        columWidths[0] = personLabel.length() + Integer.toString(people).length() + 1;
        // Load the table with values
        for (int i = 0; i < table.length; i++) {
            for (int j = 0; j < table[i].length; j++) {
                table[i][j] = r.nextInt(20000 - 1000) + 1000;
                columWidths[j + 1] = Math.max(
                        columWidths[j + 1], 
                        Math.max(
                            monthLabel.length() + Integer.toString(month).length() + 1, 
                            Integer.toString(table[i][j]).length() + 2));
            }
        }


        // Print the table
        System.out.println("\n\nSummer Internship Salary Information:");
        System.out.print(pad("", columWidths[0]));
        for (int i = 0; i < month; i++) {
            String value = monthLabel + String.format("%d", i);
            value += pad(value, columWidths[i + 1]);
            System.out.print(value);
        }
        System.out.println();

        for (int i = 0; i < table.length; i++) {
            String value = personLabel + String.format("%d", i);
            value += pad(value, columWidths[0]);
            System.out.print(value);
            for (int j = 0; j < table[i].length; j++) {
                value = String.format("$%d", table[i][j]);
                value += pad(value, columWidths[j + 1]);
                System.out.print(value);
            }
            System.out.println();

        }
    }

    public static String pad(String value, int length) {
        StringBuilder sb = new StringBuilder(length);
        while ((value.length() + sb.length()) < length) {
            sb.append(" ");
        }
        return sb.toString();
    }
}

Which outputs something like...

           Month #0  Month #1  Month #2  Month #3  Month #4  Month #5  Month #6  Month #7  Month #8  Month #9  Month #10 Month #11 
Person #0  $19428    $6333     $19057    $9502     $3265     $3731     $13855    $10254    $2997     $11370    $3264     $13038    
Person #1  $11988    $2313     $7722     $13457    $1100     $10589    $5453     $5996     $12301    $11490    $12283    $4407     
Person #2  $15179    $13993    $19421    $12370    $12090    $18623    $13716    $13215    $7308     $8446     $6657     $7861     
Person #3  $19673    $2956     $10505    $11141    $2020     $1025     $6833     $8821     $4366     $4127     $8938     $16353    
Person #4  $17210    $9442     $7960     $3178     $19924    $17406    $9637     $11655    $13862    $9136     $17205    $10832    
Person #5  $1609     $16141    $17245    $5073     $5716     $17390    $11861    $10235    $12540    $6037     $5199     $1782     
Person #6  $10721    $2257     $16660    $6635     $17384    $9606     $17578    $16799    $4066     $1960     $9563     $4705     
Person #7  $13224    $17277    $5932     $8532     $17321    $12650    $9672     $12527    $2251     $2702     $9033     $10322    
Person #8  $11625    $14107    $1171     $19300    $18455    $13178    $15637    $19687    $12751    $8870     $9412     $6501     
Person #9  $18550    $17017    $6902     $16676    $1057     $12067    $17656    $9220     $15494    $18450    $17341    $10378    
Person #10 $18408    $1907     $1203     $17781    $17106    $4861     $19259    $16245    $12223    $16278    $4429     $18283    
Person #11 $17548    $6160     $18262    $9116     $15075    $16619    $19431    $3463     $15789    $17814    $2059     $16414    
Person #12 $3882     $14816    $6580     $14257    $2192     $11033    $1387     $12269    $14246    $18406    $14794    $9036     
Person #13 $14124    $10216    $11960    $7462     $18001    $6254     $12928    $18118    $14161    $10585    $8102     $7295     
Person #14 $9849     $4085     $7184     $16173    $6847     $10288    $1796     $17384    $11323    $10811    $2636     $9946     
Person #15 $13500    $15157    $7618     $1810     $9368     $3295     $12586    $17489    $16092    $10978    $15227    $5506     
Person #16 $19668    $8540     $16249    $1039     $13672    $14082    $8978     $2710     $17092    $11280    $8090     $10266    
Person #17 $18138    $7467     $18246    $7110     $16501    $6583     $14026    $14204    $10877    $18628    $14575    $4836     
Person #18 $15090    $1579     $15613    $8480     $15854    $15687    $10024    $17004    $15452    $16351    $13714    $19755    
Person #19 $11015    $1152     $11733    $7620     $18217    $8518     $7243     $11819    $10313    $4339     $13532    $13700