Chapter_09.rar_aide

/* TwoDimArrayPractice * Anderson, Franceschi */ import java.awt.*; import javax.swing.*; import javax.swing.JOptionPane; import java.awt.event.*; public class TwoDimArrayPractice extends JFrame { // GUI components private JButton fillValues; private JButton printArray; private JButton setValues; private JButton findMinimum; private JButton countFrequency; private ButtonHandler bh; private static int [][] intArray; private final int ROWS = 4; private final int COLUMNS = 20; private static int current1 = -1; private static int current2 = -1; private int key; private int rowSelected = -1; private int columnSelected = -1; private BarChart bc; private static int counter = 0; private static TwoDimArrayPractice app; private boolean firstTime = true; private Image offscreen; public TwoDimArrayPractice( ) { super( "Choose your activity" ); Container c = getContentPane( ); c.setLayout( new FlowLayout( ) ); fillValues = new JButton( "Fill Values" ); c.add( fillValues ); printArray = new JButton( "Print Array" ); c.add( printArray ); setValues = new JButton( "Set Values" ); c.add( setValues ); findMinimum = new JButton( "Find Minimum" ); c.add( findMinimum ); countFrequency = new JButton( "Count Frequency" ); c.add( countFrequency ); bh = new ButtonHandler( ); fillValues.addActionListener( bh ); printArray.addActionListener( bh ); setValues.addActionListener( bh ); findMinimum.addActionListener( bh ); countFrequency.addActionListener( bh ); setSize( 500,550 ); intArray = new int[ROWS][COLUMNS]; // fill with random numbers between 50 and 80 for ( int i = 0; i < intArray.length; i++ ) { for ( int j = 0; j < intArray[0].length; j++ ) { intArray[i][j] = (int) ( Math.random( ) * 31 ) + 50; } } bc = new BarChart( intArray ); // print the array values System.out.println( "Element\tValue" ); for ( int i = 0; i < intArray.length; i++ ) { System.out.print( i + "\t" ); for ( int j = 0; j < intArray[i].length; j++ ) { System.out.print( intArray[i][j] + " " ); } System.out.println( ); } System.out.println( ); setVisible( true ); offscreen = this.createImage( getSize( ).width, getSize( ).height ); } // ***** 1. This method has been coded as an example /** Fills the array with random numbers between 50 and 80 * The instance variable named intArray is the integer array to be * filled with values */ public void fillValues( ) { for ( int row = 0; row < intArray.length; row++ ) { System.out.print( row + "\t" ); for ( int column = 0; column < intArray[row].length; column++ ) { intArray[row][column] = (int) ( Math.random( ) * 31 ) + 50; animate( row, column ); // needed to create visual feedback } System.out.println( ); } } // end of fillValues method // ***** 2. Student writes this method /** Prints array to the console, elements are separated by a space * The instance variable named intArray is the integer array to be printed */ public void printArray( ) { // Note: To animate the algorithm, put this method call as the // last element in your inner for loop // animate( row, column ); // where row is the index of the array's current row // and column is the index of the array's current column // Write your code here: } // end of printArray method // ***** 3. Student writes this method /** Sets all the elements in the specified row to the specified value * The instance variable named intArray is the integer array * @param value the value to assign to the element of the row * @param row the row in which to set the elements to value */ public void setValues( int value, int row ) { // Note: To animate the algorithm, put this method call as the // last element in your for loop // animate( row, column ); // where row is the index of the array's current row // and column is the index of the array's current column // Write your code here: } // end of setValues method // ***** 4. Student writes this method /** Finds minimum value in the specified column * The instance variable named intArray is the integer array * @param column the column to search * @return the minimum value found in the column */ public int findMinimum( int column ) { // Note: To animate the algorithm, put this method call as the // last element in your for loop // animate( row, column, minimum ); // where row is the index of the array's current row, // column is the index of the array's current column // minimum is the local variable storing the current minimum // Write your code here: return 0; // replace this line with your return statement } // end of findMinimumn method // ***** 5. Student writes this method /** Finds the number of times value is found in the array * The instance variable named intArray is the integer array * @param value the value to count * @return the number of times value was found */ public int countFound( int value ) { // Note: To animate the algorithm, put this method call as the // last element in your inner for loop // animate( row, column, num ); // where row is the index of the array's current row, // column is the index of the array's current column, and // num is the local variable storing the current frequency count // Write your code here: return 0; // replace this line with your return statement } // end of countFound method public void startActivity( int act ) { bc.setActivity( act ); boolean goodInput = false; String answer = ""; switch( act ) { case( 0 ): fillValues( ); JOptionPane.showMessageDialog( null, "Array filled with new values" ); break; case( 1 ): printArray( ); JOptionPane.showMessageDialog( null, "Array printed" ); break; case( 2 ): while ( !goodInput || key < 50 || key > 80 ) { try { answer = JOptionPane.showInputDialog( null, "Enter a value between 50 and 80" ); if ( answer != null ) { key = Integer.parseInt( answer ); goodInput = true; } else { goodInput = false; break; } } catch( Exception e ) {} } if ( goodInput ) { goodInput = false; while ( !goodInput || rowSelected < 0 || rowSelected > 3 ) { try { answer = JOptionPane.showInputDialog( null, "Enter a row number between 0 and 3" ); if ( answer != null ) { rowSelected = Integer.parseInt( answer ); goodInput = true; } else { goodInput = false; break; } } catch( Exception e ) {} } } if ( goodInput ) { bc.setKey ( key ); setValues( key, rowSelected ); String message = ""; if ( bc.getCheckNewValues( ) ) message = " correctly"; else message = " incorrectly"; JOptionPane.showMess