/** ArrayListPractice Anderson, Franceschi */ import java.awt.*; import javax.sw
ID: 3866402 • Letter: #
Question
/** ArrayListPractice
Anderson, Franceschi
*/
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.Iterator;
public class ArrayListPractice extends JFrame
{
// GUI components
private JButton fillValues;
private JButton printAutoList;
private JButton setValues;
private JButton findMaximum;
private JButton countFrequency;
private ButtonHandler bh;
private static ArrayList<Auto> 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<Auto>( );
ad = new AutoDisplay( carList );
setVisible( true );
ad.setEraseColor( getBackground( ) );
// fill carList with several cars
fillWithCars( );
}
// ***** 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 cars
carList.clear();
// Reset the number of Autos to 0
// This is needed so that the animation feedback works correctly
Auto.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 a space
* The instance variable carList is the ArrayList to be printed
*/
public void printAutoList()
{
// Note: To animate the algorithm, put this method call as the
// 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:
// Part 2 student code ends here.
}
// ***** 3. Student writes this method
/** Sets the model of all the elements in carList to parameter value
* The instance variable carList is the ArrayList to be modified
* @param model the model to assign to all Auto objects in carList
*/
public void setModelValues(String model)
{
// Note: To animate the algorithm, put this method call as the
// 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 as the
// 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 current maximum
// number of miles for all Auto elements you have already tested
// as you loop through the ArrayList object
// Part 4 student code starts here:
return 0; // replace this statement with your return statement
// Part 4 student code ends here.
}
// ***** 5. Student writes this method
/** Finds number of times parameter model is found in the carList
* Instance variable carList is the ArrayList in which we search
* @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 as the
// 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's parameter
// as you loop through the ArrayList object
// Part 5 student code starts here:
return 0; // replace this statement with your return statement
// 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 new values" );
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 = " Your result is correct";
else
message = " Your result is not correct";
JOptionPane.showMessageDialog( null, "car models set to " + answer + message );
}
break;
case 3:
int a = findMaximumMilesDriven( );
if ( a == ad.getCurrentMaximumMilesDriven( ) )
message = " Your result is correct";
else
message = " Your result is not correct";
JOptionPane.showMessageDialog( null, "The maximum number of miles driven 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 = " Your result is correct";
else
message = " Your 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 );
else
JOptionPane.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 arguments
JOptionPane.showMessageDialog( null, "Wrong number of arguments to animate 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 arguments
JOptionPane.showMessageDialog( null, "Wrong number of arguments to animate 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 arguments
JOptionPane.showMessageDialog( null, "Wrong number of arguments to animate 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<Auto> arr;
ArrayListPractice s1;
public printAutoListT ( ArrayListPractice s )
{
arr = ArrayListPractice.carList;
s1 = s;
}
public void run( )
{
startActivity( ad.getActivity( ) );
}
}
}
Explanation / Answer
class Vehicle { String regno; int model; Vehicle(String r, int m) { regno=r; model=m; } void display() { System.out.println("Registration no: "+regno); System.out.println("Model no: "+model); } } class Twowheeler extends Vehicle { int noofwheel; Twowheeler(String r,int m,int n) { super(r,m); noofwheel=n; } void display() { System.out.println("Two wheeler tvs"); super.display(); System.out.println("No. of wheel : " +noofwheel); } } class Threewheeler extends Vehicle { int noofleaf; Threewheeler(String r,int m,int n) { super(r,m); noofleaf=n; } void display() { System.out.println("Three wheeler auto"); super.display(); System.out.println("No. of leaf:" +noofleaf); } } class Fourwheeler extends Vehicle { int noofleaf; Fourwheeler(String r,int m,int n) { super(r,m); noofleaf=n; } void display() { System.out.println("Four wheeler car"); super.display(); System.out.println("No. of leaf:" +noofleaf); } } class VehicleDemo { public static void main(String arg[]) { Twowheeler t1; Threewheeler th1; Fourwheeler f1; t1=new Twowheeler("TN74 12345", 1,2); th1=new Threewheeler("TN74 54321", 4,3); f1=new Fourwheeler("TN34 45677",5,4); t1.display(); th1.display(); f1.display(); } }
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