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This is Activity 9.2 fro Java Illuminated 4th edition. Im having major trouble with this code. part one is alreadycoded for me but parts two through five I do on my own. For it Ihave to use a series of enhanced for loops. Part two I feel Ivealmost worked out (Ive turned it into a comment) its a solution ifound studying the textbook but I need to know if it makessense. import java.awt.*;import javax.swing.*;import java.awt.event.*;import java.util.ArrayList;import java.util.Iterator; public class ArrayListPractice extends JFrame{// GUI componentsprivate JButton fillValues;private JButton printAutoList;private JButton setValues;private JButton findMaximum;private JButton countFrequency; private ButtonHandler bh; private static ArrayList carList;private static Auto current = null;private AutoDisplay ad; private static ArrayListPractice app;private boolean firstTime = true; public ArrayListPractice( ){super( “Choose your activity” );Container c = getContentPane( );c.setLayout( new FlowLayout( ) ); fillValues = new JButton( “Fill Cars” );c.add( fillValues );printAutoList = new JButton( “Print Auto List” );c.add( printAutoList );setValues = new JButton( “Set Models” );c.add( setValues );findMaximum = new JButton( “Find Maximum Miles” );c.add( findMaximum );countFrequency = new JButton( “Count Model Frequency” );c.add( countFrequency ); bh = new ButtonHandler( );fillValues.addActionListener( bh );printAutoList.addActionListener( bh );setValues.addActionListener( bh );findMaximum.addActionListener( bh );countFrequency.addActionListener( bh ); setSize( 500,400 ); carList = new ArrayList( ); ad = new AutoDisplay( carList );setVisible( true );ad.setEraseColor( getBackground( ) );// fill carList with several carsfillWithCars( );} // ***** 1. This method has been coded as an example/** Fills the carList with hard-coded Auto objects* The instance variable carList is the ArrayList* to be filled with Auto objects*/public void fillWithCars(){// clear carList before adding carscarList.clear();// Reset the number of Autos to 0// This is needed so that the animation feedback workscorrectlyAuto.clearNumberAutos(); Auto car1 = new Auto(“BMW”, 0, 0.0);Auto car2 = new Auto(“Ferrari”, 100, 500.0);Auto car3 = new Auto(“Jeep”, 1000, 90.0);Auto car4 = new Auto(“Ferrari”, 10, 3.0);Auto car5 = new Auto(“BMW”, 4000, 200.0);Auto car6 = new Auto(“Ferrari”, 1000, 50.0); carList.add(car1);carList.add(car2);carList.add(car3);carList.add(car4);carList.add(car5);carList.add(car6);animate();} // ***** 2. Student writes this method/** Prints carList to console, elements are separated by aspace* The instance variable carList is the ArrayList to beprinted*/public void printAutoList(){// Note: To animate the algorithm, put this method call asthe// last element in your for loop// animate(car);// where car is the variable name for the current Auto object// as you loop through the ArrayList object// Part 2 student code starts here: /** String result = “”;for (Auto currentAuto : carList){result += currentAuto.toString()+”n”;}return result;// Part 2 student code ends here.} */ // ***** 3. Student writes this method/** Sets the model of all the elements in carList to parametervalue* The instance variable carList is the ArrayList to bemodified* @param model the model to assign to all Auto objects incarList*/public void setModelValues(String model){// Note: To animate the algorithm, put this method call asthe// last statement in your for loop// animate(car);// where car is the variable name for the current Auto object// as you loop through the ArrayList object// Part 3 student code starts here: // Part 3 student code ends here.} // ***** 4. Student writes this method/** Finds maximum number of miles driven* Instance variable carList is the ArrayList to search* @return the maximum miles driven by all the Auto objects*/public int findMaximumMilesDriven(){// Note: To animate the algorithm, put this method call asthe// last statement in your for loop// animate(car, maximum);// where car is the variable name for the current Auto object// and maximum is the int variable storing the currentmaximum// number of miles for all Auto elements you have alreadytested// as you loop through the ArrayList object// Part 4 student code starts here: return 0; // replace this statement with your returnstatement // Part 4 student code ends here.} // ***** 5. Student writes this method/** Finds number of times parameter model is found in thecarList* Instance variable carList is the ArrayList in which wesearch* @param model the model to count* @return the number of times model was found*/public int countFound(String model){// Note: To animate the algorithm, put this method call asthe// last statement in your for loop// animate(car, num);// where car is the variable name for the current Auto object// and num is the int variable storing the current number of// Auto elements whose model is equal to the method’sparameter// as you loop through the ArrayList object// Part 5 student code starts here: return 0; // replace this statement with your returnstatement // Part 5 student code ends here.} public void startActivity( int act ){ad.setActivity( act );boolean goodInput = false;String answer = “”;String message = “”;switch( act ){case 0:fillWithCars( );JOptionPane.showMessageDialog( null, “carList filled with newvalues” );break; case 1:printAutoList( );JOptionPane.showMessageDialog( null, “carList printed” );break; case 2:answer = JOptionPane.showInputDialog( null, “Enter a car model”);if (answer != null ){ad.setSearchModel( answer );setModelValues( answer );if ( ad.getCurrentModelValuesSet( ) )message = “nYour result is correct”;elsemessage = “nYour result is not correct”;JOptionPane.showMessageDialog( null, “car models set to ” + answer+ message );}break; case 3:int a = findMaximumMilesDriven( );if ( a == ad.getCurrentMaximumMilesDriven( ) )message = “nYour result is correct”;elsemessage = “nYour result is not correct”;JOptionPane.showMessageDialog( null, “The maximum number of milesdriven is ” + a + message );break; case 4:answer = JOptionPane.showInputDialog( null, “Enter a car model”);if ( answer != null ){ad.setSearchModel( answer );int frequency = countFound( answer );if ( frequency == ad.getCurrentCountModelFound( ) )message = “nYour result is correct”;elsemessage = “nYour result is not correct”;if ( frequency > 1 )JOptionPane.showMessageDialog( null, answer + ” found ” + frequency+ ” times” + message );else if ( frequency == 1 )JOptionPane.showMessageDialog( null, answer + ” found ” + frequency+ ” time” + message );elseJOptionPane.showMessageDialog( null, answer + ” not found” +message );}break;}enableButtons( );} public static Auto getCurrent( ){return current;} public static ArrayList getCarList( ){return carList;} private void animate( Auto au ){if ( ad.getActivity( ) == 1 || ad.getActivity( ) == 2 ){try{current = au;ad.setCarList( carList );ad.setCurrentAuto( au );ad.setCurrentIndex( au.getIndex( ) );repaint( );Thread.sleep( 4000 );}catch ( InterruptedException e ){System.out.println( “IE Exception ” + e.getMessage( ) );System.out.println( e.toString( ) );}}else{// call to animate has wrong number of argumentsJOptionPane.showMessageDialog( null, “Wrong number of arguments toanimate method” );System.exit( 1 );}} private void animate( Auto au, int studentResult ){if ( ad.getActivity( ) == 3 || ad.getActivity( ) == 4 ){try{current = au;ad.setCarList( carList );ad.setCurrentAuto( au );ad.setCurrentIndex( au.getIndex( ) );ad.setStudentResult( studentResult );repaint( );Thread.sleep( 4000 );}catch ( InterruptedException e ){System.out.println( “IE Exception ” + e.getMessage( ) );System.out.println( e.toString( ) );}}else{// call to animate has wrong number of argumentsJOptionPane.showMessageDialog( null, “Wrong number of arguments toanimate method” );System.exit( 1 );}} private void animate( ){if ( ad.getActivity( ) == 0 ){try{ad.setCarList( carList );repaint( );Thread.sleep( 4000 );}catch ( InterruptedException e ){System.out.println( “IE Exception ” + e.getMessage( ) );System.out.println( e.toString( ) );}}else{// call to animate has wrong number of argumentsJOptionPane.showMessageDialog( null, “Wrong number of arguments toanimate method” );System.exit( 1 );}} public void paint( Graphics g ){if ( ( ( current != null ) || firstTime ) && (ad.getActivity( ) != 0 ) ){super.paint( g );if ( ad.getCurrentAuto( ) != null )ad.updateAutoDisplay( current, g );firstTime = false;}else if ( ad.getActivity( ) == 0 ){super.paint( g );ad.updateAutoDisplay( g );}} public static void main( String [] args ){app = new ArrayListPractice( );app.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );} public void disableButtons( ){fillValues.setEnabled( false );printAutoList.setEnabled( false );setValues.setEnabled( false );countFrequency.setEnabled( false );findMaximum.setEnabled( false );} public void enableButtons( ){fillValues.setEnabled( true );printAutoList.setEnabled( true );setValues.setEnabled( true );countFrequency.setEnabled( true );findMaximum.setEnabled( true );} private class ButtonHandler implements ActionListener{private boolean on = true;public void actionPerformed( ActionEvent e ){printAutoListT t = new printAutoListT( app ); if ( e.getSource( ) == fillValues ){disableButtons( );fillValues.requestFocus( );ad.setActivity( 0 );t.start( );}else if ( e.getSource( ) == printAutoList ){disableButtons( );printAutoList.requestFocus( );ad.setActivity( 1 );t.start( );}else if ( e.getSource( ) == setValues ){disableButtons( );setValues.requestFocus( );ad.setActivity( 2 );t.start( );}else if ( e.getSource( ) == findMaximum ){disableButtons( );findMaximum.requestFocus( );ad.setActivity( 3 );t.start( );}else if ( e.getSource( ) == countFrequency ){disableButtons( );countFrequency.requestFocus( );ad.setActivity( 4 );t.start( );}}} private class printAutoListT extends Thread{ArrayList arr;ArrayListPractice s1;public printAutoListT ( ArrayListPractice s ){arr = ArrayListPractice.carList;s1 = s;}public void run( ){startActivity( ad.getActivity( ) );}}} . . .
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