// Fig. 7.16: DoubleArray.java
// 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 ] + "   ";
      }
   }
}

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 * (C) Copyright 1999 by Deitel & Associates, Inc. and Prentice Hall.     *
 * All Rights Reserved.                                                   *
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