Double Array

// Double-subscripted array example
import java.awt.*;
import javax.swing.*;

public class DoubleArray extends JApplet
{
int grades[][] = { { 77, 68, 86, 73 }, { 96, 87, 89, 81 }, { 70, 90, 86, 81 } };

int students, exams;
String output;
JTextArea outputArea;

// initialize instance variables
public void init()
{
students = grades.length;
exams = grades[ 0 ].length;

outputArea = new JTextArea();
Container c = getContentPane();
c.add( outputArea );

// build the output string
output = "The array is:\n";
buildString();

output += "\n\nLowest grade: " + minimum() +
"\nHighest grade: " + maximum() + "\n";

for ( int i = 0; i < students; i++ )
output += "\nAverage for student " + i + " is " + average( grades[ i ] );

outputArea.setFont( new Font( "Courier", Font.PLAIN, 12 ) );
outputArea.setText( output );
}

// find the minimum grade
public int minimum()
{
int lowGrade = 100;

for ( int i = 0; i < students; i++ )
for ( int j = 0; j < exams; j++ )
if ( grades[ i ][ j ] < lowGrade )
lowGrade = grades[ i ][ j ];

return lowGrade;
}


// find the maximum grade
public int maximum()
{
int highGrade = 0;

for ( int i = 0; i < students; i++ )
for ( int j = 0; j < exams; j++ )
if ( grades[ i ][ j ] > highGrade )
highGrade = grades[ i ][ j ];

return highGrade;
}

// determine the average grade for a particular
// student (or set of grades)
public double average( int setOfGrades[] )
{
int total = 0;

for ( int i = 0; i < setOfGrades.length; i++ )
total += setOfGrades[ i ];

return ( double ) total / setOfGrades.length;
}

// build output string
public void buildString()
{
output += " "; // used to align column heads

for ( int i = 0; i < exams; i++ )
output += "[" + i + "] ";

for ( int i = 0; i < students; i++ )
{
output += "\ngrades[" + i + "] ";

for ( int j = 0; j < exams; j++ )
output += grades[ i ][ j ] + " ";
}
}
}