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Event Handling. The Plan. Sequential (Single Thread) Model Event Model Making the GUI interactive Examples Practice. Sequential (Single Thread) Model. Program Start. Program End. Event Model. Program Thread. AWT Event Loop. Event Model. Program Thread. Event Model. AWT Event

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Event Handling

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Event handling l.jpg

Event Handling


The plan l.jpg

The Plan

  • Sequential (Single Thread) Model

  • Event Model

  • Making the GUI interactive

  • Examples

  • Practice


Sequential single thread model l.jpg

Sequential (Single Thread) Model

Program

Start

Program

End


Event model l.jpg

Event Model

Program

Thread

AWT

Event

Loop


Event model5 l.jpg

Event Model

Program

Thread


Event model6 l.jpg

Event Model

AWT

Event

Loop


Making the gui interactive l.jpg

Making the GUI Interactive

  • import java.awt.event.*

  • implements ActionListener

  • write methodpublic void actionPerformed(ActionEvent e)

  • calladdActionListener(this)for allJButtons


Examples l.jpg

Examples

GameShell.java

AdderGUI.java


Examples9 l.jpg

Examples

AdderGUI.java

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class AdderGUI

extends JApplet

implements ActionListener


Examples10 l.jpg

Examples

AdderGUI.java

public void actionPerformed(ActionEvent ae)

{

String addend0Text=addend0.getText();

double addend0Number=Double.parseDouble(addend0Text);

String addend1Text=addend1.getText();

double addend1Number=Double.parseDouble(addend1Text);

double answer=addend0Number+addend1Number;

sum.setText(""+answer);

}


Examples11 l.jpg

Examples

AdderGUI.java

private void makeComponents()

{

frame=new JFrame("Game Shell");

addend0=new JTextField(8);

addend1=new JTextField(8);

sum=new JTextField(8);

compute=new JButton("=");

compute.addActionListener(this);

plus=new JLabel("+");

plus.setHorizontalAlignment(SwingConstants.CENTER);

}


Examples12 l.jpg

GameShell.java

Examples

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class GameShell

extends JApplet

implements ActionListener


Examples13 l.jpg

Examples

public void actionPerformed(ActionEvent ae)

{

Object cause=ae.getSource();

if(cause==pause)

{

if(pause.getText().equals("Pause"))

{

pause.setText("Resume");

shell.setText("Paused");

}

else

{

pause.setText("Pause");

shell.setText("Game Running");

}

}

if(cause==reset)

{

pause.setText("Start");

shell.setText("Splash");

}

}

GameShell.java


Examples14 l.jpg

GameShell.java

Examples

pause=new JButton("Start"); pause.addActionListener(this);

reset=new JButton("Start New Game"); reset.addActionListener(this);


Practice l.jpg

Practice

  • Make a 2x2 tic-tac-toe board out of initially blank Jbuttons.

  • Make the JButton text change to X when the user clicks on it.

  • Make the JButton text change to X and O alternatively as the user clicks on the buttons.Hint: use a boolean instance variable.

  • Make the fonts larger, and maybe add images.

  • Look at Splash.java and SplashLoop.java in Splash.jar


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