What Is an Event? Some event handler. ActionEvent. actionperformed(actionevent e) { }
|
|
- Warren Ray
- 6 years ago
- Views:
Transcription
1 CBOP3203
2 What Is an Event? Events Objects that describe what happened Event Sources The generator of an event Event Handlers A method that receives an event object, deciphers it, and processes the user s interaction. The user clicks on the button ActionEvent Some event handler actionperformed(actionevent e) {
3 Event Delegation Model describes the steps that need to be followed by a programmer in order to insert codes for event handling in a program. With this model, events are sent to the component from which the event originated, but it is up to each component to propagate the event to one or more registered classes called listeners. Listeners contain event handlers that receive and process the event. In this way, the event handler can be in an object separate from the component. Listeners are classes that implement the EventListener interface.
4 An event can be sent to many event handlers. Event handlers register with components when they are interested in events generated by that component.
5 Client objects (handlers) register with a GUI component that they want to observe GUI components trigger only the handlers for the type of event that has occurred Most components can trigger more than one type of event. The delegation model distributes the work among multiple classes.
6
7
8
9
10 import javax.swing.*; import java.awt.*; import java.awt.event.*; public class btnlistener extends JApplet implements ActionListener { public void init(){ Container conpane=getcontentpane(); conpane.setlayout(new FlowLayout()); JButton btntest=new JButton("Press Me"); btntest.addactionlistener(this); conpane.add(btntest); Make sure the java.awt.event.* package is imported Use the listener interface together with the implements statements public void actionperformed(actionevent e) { JOptionPane.showMessageDialog( null, "Why did you press me?" );
11 import javax.swing.*; import java.awt.*; public class colorapplet extends JApplet { public void init( ){ Container conpane=getcontentpane( ); conpane.add(new Pattern()); Save this class as colorapplet.java
12 import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Pattern extends JPanel implements ActionListener { private JButton btnred,btngreen,btnblue; public Pattern() { btnred = new JButton("red"); btngreen = new JButton("green"); btnblue = new JButton("blue"); btnred.addactionlistener(this); btngreen.addactionlistener(this); btnblue.addactionlistener(this); add(btnred); add(btngreen); add(btnblue); public void actionperformed(actionevent e) { Object source = e.getsource( ); Color clr = Color.white; if (source==btnred) clr = Color.red; else if (source==btngreen) clr = Color.green; else if (source==btnblue) clr = Color.blue; setbackground(clr); repaint(); Save this class as Pattern.java implements ActionListener When the Button object is clicked on with the mouse, an ActionEvent is sent. The ActionEvent is received through the actionperformed() method of any ActionListener that is registered on the button through its addactionlistener() method
13 import javax.swing.*; import java.awt.*; import java.awt.event.*; public class calculateapplet extends JApplet implements ActionListener { JTextField txt1,txt2,txt3; JLabel lbl1,lbl2,lbl3; public void init( ) { Container conpane = getcontentpane( ); conpane.setlayout(new GridLayout(3,2)); lbl1 = new JLabel("First Number"); lbl2 = new JLabel("Second Number"); lbl3 = new JLabel("Sum of two integers"); txt1 = new JTextField("0",10); txt2 = new JTextField("0",10); txt3 = new JTextField("0",10); txt1.addactionlistener(this); txt2.addactionlistener(this); txt3.addactionlistener(this); conpane.add(lbl1); conpane.add(txt1); conpane.add(lbl2); conpane.add(txt2); conpane.add(lbl3); conpane.add(txt3); public void actionperformed(actionevent e) { int num1 = Integer.parseInt(txt1.getText( )); int num2 = Integer.parseInt(txt2.getText( )); int num3 = num1 + num2; txt3.settext(string.valueof(num3));
14 import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Alphabet extends JApplet implements ItemListener { private JTextField txtinput; private JCheckBox chkbold,chkitalic; public void init( ){ Container conpane = getcontentpane( ); conpane.setlayout(new FlowLayout( )); txtinput = new JTextField("",20); chkbold = new JCheckBox("Bold",false); chkitalic = new JCheckBox("Italic",false); chkbold.additemlistener(this); chkitalic.additemlistener(this); conpane.add(txtinput); conpane.add(chkbold); conpane.add(chkitalic); public void itemstatechanged(itemevent e){ int t=0,c=0; Font font; if (chkbold.isselected( )) t = Font.BOLD; if (chkitalic.isselected( )) { c = Font.ITALIC; font = new Font("Serif",t + c, 14); txtinput.setfont(font); There are a few components that use the ItemListener of the event listener. Among the components used are the JCheckBox and JList. The ItemListener performs the itemstatechanged method to implement action to the events. While additemlistener is used to register the component.
15 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class RGBColor extends JApplet implements AdjustmentListener { private JLabel lblred; private JLabel lblgreen; private JLabel lblblue; private JScrollBar barred; private JScrollBar bargreen; private JScrollBar barblue; private JPanel panelcolor; public void init() { Container conpane = getcontentpane(); JPanel p = new JPanel( ); p.setlayout(new GridLayout(3, 2)); lblred = new JLabel("Red 0"); p.add(lblred); barred=new JScrollBar(Adjustable.HORIZONTAL, 0,0, 0, 255); p.add(barred); barred.setblockincrement(16); barred.addadjustmentlistener(this); The java file continues on next page
16 lblgreen = new JLabel("Green 0"); p.add(lblgreen); bargreen = new JScrollBar(Adjustable.HORIZONTAL, 0, 0, 0,255); p.add(bargreen); bargreen.setblockincrement(16); bargreen.addadjustmentlistener(this); lblblue = new JLabel("Blue 0"); p.add(lblblue); barblue= new JScrollBar(Adjustable.HORIZONTAL, 0, 0, 0,255); p.add(barblue); barblue.setblockincrement(16); barblue.addadjustmentlistener(this); conpane.add(p, "South"); panelcolor = new JPanel(); panelcolor.setbackground(new Color(0, 0, 0)); conpane.add(panelcolor, "Center"); public void adjustmentvaluechanged(adjustmentevent evt){ lblred.settext("red " + barred.getvalue()); lblgreen.settext("green " + bargreen.getvalue()); lblblue.settext("blue " + barblue.getvalue()); panelcolor.setbackground(new Color(barRed.getValue(), bargreen.getvalue( ), barblue.getvalue())); panelcolor.repaint();
17 Q1. Write a temperature conversion applet that converts from Fahrenheit to Celsius. The Fahrenheit temperature should be entered from the keyboard (via a JTextField). A JLabel should be used to display the converted temperature. Use the following formula for the conversion:
18 Q2. Enhance the temperature conversion applet of Q1 by adding the Kelvin temperature scale. The applet should also allow the user to make conversions between any two scales. Use the following formula for the conversion between Kelvin and Celsius (in addition to the formula in Q1):
Introduction. Introduction
Introduction Many Java application use a graphical user interface or GUI (pronounced gooey ). A GUI is a graphical window or windows that provide interaction with the user. GUI s accept input from: the
More informationEVENTS, EVENT SOURCES AND LISTENERS
Java Programming EVENT HANDLING Arash Habibi Lashkari Ph.D. Candidate of UTM University Kuala Lumpur, Malaysia All Rights Reserved 2010, www.ahlashkari.com EVENTS, EVENT SOURCES AND LISTENERS Important
More informationAgenda. Container and Component
Agenda Types of GUI classes/objects Step-by-step guide to create a graphic user interface Step-by-step guide to event-handling PS5 Problem 1 PS5 Problem 2 Container and Component There are two types of
More informationMIT AITI Swing Event Model Lecture 17
MIT AITI 2004 Swing Event Model Lecture 17 The Java Event Model In the last lecture, we learned how to construct a GUI to present information to the user. But how do GUIs interact with users? How do applications
More informationSwing/GUI Cheat Sheet
General reminders To display a Swing component, you must: Swing/GUI Cheat Sheet Construct and initialize the component. Example: button = new JButton ("ButtonLabel"); Add it to the content pane of the
More informationGraphical User Interface (GUI) components in Java Applets. With Abstract Window Toolkit (AWT) we can build an applet that has the basic GUI
CBOP3203 Graphical User Interface (GUI) components in Java Applets. With Abstract Window Toolkit (AWT) we can build an applet that has the basic GUI components like button, text input, scroll bar and others.
More informationAP CS Unit 11: Graphics and Events
AP CS Unit 11: Graphics and Events This packet shows how to create programs with a graphical interface in a way that is consistent with the approach used in the Elevens program. Copy the following two
More informationCommand-Line Applications. GUI Libraries GUI-related classes are defined primarily in the java.awt and the javax.swing packages.
1 CS257 Computer Science I Kevin Sahr, PhD Lecture 14: Graphical User Interfaces Command-Line Applications 2 The programs we've explored thus far have been text-based applications A Java application is
More informationDEMYSTIFYING PROGRAMMING: CHAPTER FOUR
DEMYSTIFYING PROGRAMMING: CHAPTER FOUR Chapter Four: ACTION EVENT MODEL 1 Objectives 1 4.1 Additional GUI components 1 JLabel 1 JTextField 1 4.2 Inductive Pause 1 4.4 Events and Interaction 3 Establish
More informationGUI 4.1 GUI GUI MouseTest.java import javax.swing.*; import java.awt.*; import java.awt.event.*; /* 1 */
25 4 GUI GUI GUI 4.1 4.1.1 MouseTest.java /* 1 */ public class MouseTest extends JApplet implements MouseListener /* 2 */ { int x=50, y=20; addmouselistener(this); /* 3 */ super.paint(g); /* 4 */ g.drawstring("hello
More informationStarting Out with Java: From Control Structures Through Objects Sixth Edition
Starting Out with Java: From Control Structures Through Objects Sixth Edition Chapter 12 A First Look at GUI Applications Chapter Topics 12.1 Introduction 12.2 Creating Windows 12.3 Equipping GUI Classes
More informationTo gain experience using GUI components and listeners.
Lab 5 Handout 7 CSCI 134: Fall, 2017 TextPlay Objective To gain experience using GUI components and listeners. Note 1: You may work with a partner on this lab. If you do, turn in only one lab with both
More informationJava - Applets. public class Buttons extends Applet implements ActionListener
Java - Applets Java code here will not use swing but will support the 1.1 event model. Legacy code from the 1.0 event model will not be used. This code sets up a button to be pushed: import java.applet.*;
More informationASSIGNMENT NO 14. Objectives: To learn and demonstrated use of applet and swing components
Create an applet with three text Fields and four buttons add, subtract, multiply and divide. User will enter two values in the Text Fields. When any button is pressed, the corresponding operation is performed
More informationClass 16: The Swing Event Model
Introduction to Computation and Problem Solving Class 16: The Swing Event Model Prof. Steven R. Lerman and Dr. V. Judson Harward 1 The Java Event Model Up until now, we have focused on GUI's to present
More informationPart 3: Graphical User Interface (GUI) & Java Applets
1,QWURGXFWLRQWR-DYD3URJUDPPLQJ (( Part 3: Graphical User Interface (GUI) & Java Applets EE905-GUI 7RSLFV Creating a Window Panels Event Handling Swing GUI Components ƒ Layout Management ƒ Text Field ƒ
More informationJava & Graphical User Interface II. Wang Yang wyang AT njnet.edu.cn
Java & Graphical User Interface II Wang Yang wyang AT njnet.edu.cn Outline Review of GUI (first part) What is Event Basic Elements of Event Programming Secret Weapon - Inner Class Full version of Event
More informationChapter 12 Advanced GUIs and Graphics
Chapter 12 Advanced GUIs and Graphics Chapter Objectives Learn about applets Explore the class Graphics Learn about the classfont Explore the classcolor Java Programming: From Problem Analysis to Program
More informationJava Programming Lecture 6
Java Programming Lecture 6 Alice E. Fischer Feb 15, 2013 Java Programming - L6... 1/32 Dialog Boxes Class Derivation The First Swing Programs: Snow and Moving The Second Swing Program: Smile Swing Components
More informationGraphical Applications
Graphical Applications The example programs we've explored thus far have been text-based They are called command-line applications, which interact with the user using simple text prompts Let's examine
More informationAn array is a type of variable that is able to hold more than one piece of information under a single variable name.
Arrays An array is a type of variable that is able to hold more than one piece of information under a single variable name. Basically you are sub-dividing a memory box into many numbered slots that can
More informationPackages: Putting Classes Together
Packages: Putting Classes Together 1 Introduction 2 The main feature of OOP is its ability to support the reuse of code: Extending the classes (via inheritance) Extending interfaces The features in basic
More informationCompSci 125 Lecture 17. GUI: Graphics, Check Boxes, Radio Buttons
CompSci 125 Lecture 17 GUI: Graphics, Check Boxes, Radio Buttons Announcements GUI Review Review: Inheritance Subclass is a Parent class Includes parent s features May Extend May Modify extends! Parent
More informationProgramming Language Concepts: Lecture 8
Programming Language Concepts: Lecture 8 Madhavan Mukund Chennai Mathematical Institute madhavan@cmi.ac.in http://www.cmi.ac.in/~madhavan/courses/pl2009 PLC 2009, Lecture 8, 11 February 2009 GUIs and event
More informationJava Swing. Recitation 11/(20,21)/2008. CS 180 Department of Computer Science, Purdue University
Java Swing Recitation 11/(20,21)/2008 CS 180 Department of Computer Science, Purdue University Announcements Project 8 is out Milestone due on Dec 3rd, 10:00 pm Final due on Dec 10th, 10:00 pm No classes,
More informationPROGRAMMING DESIGN USING JAVA (ITT 303) Unit 7
PROGRAMMING DESIGN USING JAVA (ITT 303) Graphical User Interface Unit 7 Learning Objectives At the end of this unit students should be able to: Build graphical user interfaces Create and manipulate buttons,
More informationJava Graphical User Interfaces AWT (Abstract Window Toolkit) & Swing
Java Graphical User Interfaces AWT (Abstract Window Toolkit) & Swing Rui Moreira Some useful links: http://java.sun.com/docs/books/tutorial/uiswing/toc.html http://www.unix.org.ua/orelly/java-ent/jfc/
More informationGraphics. Lecture 18 COP 3252 Summer June 6, 2017
Graphics Lecture 18 COP 3252 Summer 2017 June 6, 2017 Graphics classes In the original version of Java, graphics components were in the AWT library (Abstract Windows Toolkit) Was okay for developing simple
More informationAdding Buttons to StyleOptions.java
Adding Buttons to StyleOptions.java The files StyleOptions.java and StyleOptionsPanel.java are from Listings 5.14 and 5.15 of the text (with a couple of slight changes an instance variable fontsize is
More informationJava - Applets. C&G criteria: 1.2.2, 1.2.3, 1.2.4, 1.3.4, 1.2.4, 1.3.4, 1.3.5, 2.2.5, 2.4.5, 5.1.2, 5.2.1,
Java - Applets C&G criteria: 1.2.2, 1.2.3, 1.2.4, 1.3.4, 1.2.4, 1.3.4, 1.3.5, 2.2.5, 2.4.5, 5.1.2, 5.2.1, 5.3.2. Java is not confined to a DOS environment. It can run with buttons and boxes in a Windows
More informationSystems Programming Graphical User Interfaces
Systems Programming Graphical User Interfaces Julio Villena Román (LECTURER) CONTENTS ARE MOSTLY BASED ON THE WORK BY: José Jesús García Rueda Systems Programming GUIs based on Java
More informationDEMYSTIFYING PROGRAMMING: CHAPTER SIX METHODS (TOC DETAILED) CHAPTER SIX: METHODS 1
DEMYSTIFYING PROGRAMMING: CHAPTER SIX METHODS (TOC DETAILED) CHAPTER SIX: METHODS 1 Objectives 1 6.1 Methods 1 void or return 1 Parameters 1 Invocation 1 Pass by value 1 6.2 GUI 2 JButton 2 6.3 Patterns
More informationMultiple Choice Questions: Identify the choice that best completes the statement or answers the question. (15 marks)
M257 MTA Spring2010 Multiple Choice Questions: Identify the choice that best completes the statement or answers the question. (15 marks) 1. If we need various objects that are similar in structure, but
More informationSINGLE EVENT HANDLING
SINGLE EVENT HANDLING Event handling is the process of responding to asynchronous events as they occur during the program run. An event is an action that occurs externally to your program and to which
More informationPart I: Learn Common Graphics Components
OOP GUI Components and Event Handling Page 1 Objectives 1. Practice creating and using graphical components. 2. Practice adding Event Listeners to handle the events and do something. 3. Learn how to connect
More informationWindow Interfaces Using Swing. Chapter 12
Window Interfaces Using Swing 1 Reminders Project 7 due Nov 17 @ 10:30 pm Project 6 grades released: regrades due by next Friday (11-18-2005) at midnight 2 GUIs - Graphical User Interfaces Windowing systems
More informationGraphical User Interfaces. Swing. Jose Jesus García Rueda
Graphical User Interfaces. Swing Jose Jesus García Rueda Introduction What are the GUIs? Well known examples Basic concepts Graphical application. Containers. Actions. Events. Graphical elements: Menu
More informationJava Swing. based on slides by: Walter Milner. Java Swing Walter Milner 2005: Slide 1
Java Swing based on slides by: Walter Milner Java Swing Walter Milner 2005: Slide 1 What is Swing? A group of 14 packages to do with the UI 451 classes as at 1.4 (!) Part of JFC Java Foundation Classes
More informationnavlakhi.com / navlakhi.education / navlakhi.mobi / navlakhi.org 1
Example 1 public class ex1 extends JApplet public void init() Container c=getcontentpane(); c.setlayout(new GridLayout(5,2)); JButton b1=new JButton("Add"); JButton b2=new JButton("Search"); JLabel l1=new
More informationHandout 14 Graphical User Interface (GUI) with Swing, Event Handling
Handout 12 CS603 Object-Oriented Programming Fall 15 Page 1 of 12 Handout 14 Graphical User Interface (GUI) with Swing, Event Handling The Swing library (javax.swing.*) Contains classes that implement
More informationDay before tests of Java Final test. IDM institution of Bandarawela. Project for department of education
Day before tests of Java Final test. IDM institution of Bandarawela Project for department of education import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Doenets extends JApplet
More informationDatenbank-Praktikum. Universität zu Lübeck Sommersemester 2006 Lecture: Swing. Ho Ngoc Duc 1
Datenbank-Praktikum Universität zu Lübeck Sommersemester 2006 Lecture: Swing Ho Ngoc Duc 1 Learning objectives GUI applications Font, Color, Image Running Applets as applications Swing Components q q Text
More informationCSE 143. Event-driven Programming and Graphical User Interfaces (GUIs) with Swing/AWT
CSE 143 Event-driven Programming and Graphical User Interfaces (GUIs) with Swing/AWT slides created by Marty Stepp based on materials by M. Ernst, S. Reges, D. Notkin, R. Mercer, Wikipedia http://www.cs.washington.edu/331/
More informationSwing Programming Example Number 2
1 Swing Programming Example Number 2 Problem Statement (Part 1 and 2 (H/w- assignment) 2 Demonstrate the use of swing Label, TextField, RadioButton, CheckBox, Listbox,Combo Box, Toggle button,image Icon
More informationTopic 9: Swing. Swing is a BIG library Goal: cover basics give you concepts & tools for learning more
Swing = Java's GUI library Topic 9: Swing Swing is a BIG library Goal: cover basics give you concepts & tools for learning more Assignment 5: Will be an open-ended Swing project. "Programming Contest"
More informationTopic 9: Swing. Why are we studying Swing? GUIs Up to now: line-by-line programs: computer displays text user types text. Outline. 1. Useful & fun!
Swing = Java's GUI library Topic 9: Swing Swing is a BIG library Goal: cover basics give you concepts & tools for learning more Why are we studying Swing? 1. Useful & fun! 2. Good application of OOP techniques
More informationJava Event Handling -- 1
Java Event Handling -- 1 Event Handling Happens every time a user interacts with a user interface. For example, when a user pushes a button, or types a character. 2 A Typical Situation: Scrollbar AWTEvent
More information1 GUI GUI GUI GUI GUI. GUI(Graphical User Interface) JDK java.awt. ? Component
99 6 1999.10.13 0 GUI GUI JDK 1.1 GUI 1 GUI GUI GUI(Graphical User Interface) GUI (GUI ) / ( GUI ) Java GUI JDK 1.1 1.2 1.2 Swing 1.1 java.awt GUI? Component setbounds(int, int, int, int) (x,y) setforeground(color)
More informationH212 Introduction to Software Systems Honors
Introduction to Software Systems Honors Lecture #19: November 4, 2015 1/14 Third Exam The third, Checkpoint Exam, will be on: Wednesday, November 11, 2:30 to 3:45 pm You will have 3 questions, out of 9,
More informationG51PGP Programming Paradigms. Lecture 008 Inner classes, anonymous classes, Swing worker thread
G51PGP Programming Paradigms Lecture 008 Inner classes, anonymous classes, Swing worker thread 1 Reminder subtype polymorphism public class TestAnimals public static void main(string[] args) Animal[] animals
More informationGraphical User Interfaces. Comp 152
Graphical User Interfaces Comp 152 Procedural programming Execute line of code at a time Allowing for selection and repetition Call one function and then another. Can trace program execution on paper from
More informationExample: Building a Java GUI
Steven Zeil October 25, 2013 Contents 1 Develop the Model 2 2 Develop the layout of those elements 3 3 Add listeners to the elements 9 4 Implement custom drawing 12 1 The StringArt Program To illustrate
More informationExample: Building a Java GUI
Steven Zeil October 25, 2013 Contents 1 Develop the Model 3 2 Develop the layout of those elements 4 3 Add listeners to the elements 12 4 Implement custom drawing 15 1 The StringArt Program To illustrate
More informationCommands. Written commands can be reused, cataloged, etc. Sometimes they also contain "undo" commands, too.
Commands A command is something you want someone else to perform. Instead of directly issuing a command, we can write it down and give it to someone to perform. Written commands can be reused, cataloged,
More informationParts of a Contract. Contract Example. Interface as a Contract. Wednesday, January 30, 13. Postcondition. Preconditions.
Parts of a Contract Syntax - Method signature Method name Parameter list Return type Semantics - Comments Preconditions: requirements placed on the caller Postconditions: what the method modifies and/or
More informationCS 209 Spring, 2006 Lab 8: GUI Development Instructor: J.G. Neal
CS 209 Spring, 2006 Lab 8: GUI Development Instructor: J.G. Neal Objectives: To gain experience with the programming of: 1. Graphical user interfaces (GUIs), 2. GUI components, and 3. Event handling (required
More informationName: Checked: Learn about listeners, events, and simple animation for interactive graphical user interfaces.
Lab 15 Name: Checked: Objectives: Learn about listeners, events, and simple animation for interactive graphical user interfaces. Files: http://www.csc.villanova.edu/~map/1051/chap04/smilingface.java http://www.csc.villanova.edu/~map/1051/chap04/smilingfacepanel.java
More informationCoSc Lab # 6 (The Model) Due Date: Part I, Experiment classtime, Tuesday, Nov 6 th, 2018.
CoSc 10403 Lab # 6 (The Model) Due Date: Part I, Experiment classtime, Tuesday, Nov 6 th, 2018. Part II, Program - by midnight, Tuesday, Nov 6 th, 2018. Again you will be required to "zip" together the
More informationChapter 7: A First Look at GUI Applications
Chapter 7: A First Look at GUI Applications Starting Out with Java: From Control Structures through Objects Fourth Edition by Tony Gaddis Addison Wesley is an imprint of 2010 Pearson Addison-Wesley. All
More informationBuilding a GUI in Java with Swing. CITS1001 extension notes Rachel Cardell-Oliver
Building a GUI in Java with Swing CITS1001 extension notes Rachel Cardell-Oliver Lecture Outline 1. Swing components 2. Building a GUI 3. Animating the GUI 2 Swing A collection of classes of GUI components
More informationSwing from A to Z Some Simple Components. Preface
By Richard G. Baldwin baldwin.richard@iname.com Java Programming, Lecture Notes # 1005 July 31, 2000 Swing from A to Z Some Simple Components Preface Introduction Sample Program Interesting Code Fragments
More informationAdvanced Java Unit 6: Review of Graphics and Events
Advanced Java Unit 6: Review of Graphics and Events This is a review of the basics of writing a java program that has a graphical interface. To keep things simple, all of the graphics programs will follow
More informationUser interfaces and Swing
User interfaces and Swing Overview, applets, drawing, action listening, layout managers. APIs: java.awt.*, javax.swing.*, classes names start with a J. Java Lectures 1 2 Applets public class Simple extends
More informationFrames, GUI and events. Introduction to Swing Structure of Frame based applications Graphical User Interface (GUI) Events and event handling
Frames, GUI and events Introduction to Swing Structure of Frame based applications Graphical User Interface (GUI) Events and event handling Introduction to Swing The Java AWT (Abstract Window Toolkit)
More informationCPS122 Lecture: Graphical User Interfaces and Event-Driven Programming
CPS122 Lecture: Graphical User Interfaces and Event-Driven Programming Objectives: Last revised 1/15/10 1. To introduce the notion of a component and some basic Swing components (JLabel, JTextField, JTextArea,
More informationCS 106A, Lecture 23 Interactors and GCanvas
CS 106A, Lecture 23 Interactors and GCanvas suggested reading: Java Ch. 10.5-10.6 This document is copyright (C) Stanford Computer Science and Marty Stepp, licensed under Creative Commons Attribution 2.5
More informationInformation Technology for Industrial Engineers 15 November ISE 582: Information Technology for Industrial Engineers
ISE 582: Information Technology for Industrial Engineers University of Southern California Department of Industrial and Systems Engineering Lecture 10 JAVA Cup 9: Images, Interactive Forms Handouts & Announcements
More informationCoSc Lab # 5 (The Controller)
CoSc 10403 Lab # 5 (The Controller) Due Date: Part I, Experiment classtime, Thursday, Oct 25 th, 2018. Part II, Program - by midnight, Thursday, Oct 25 th, 2018. Part I MUST be typed and submitted to your
More informationOutline. Topic 9: Swing. GUIs Up to now: line-by-line programs: computer displays text user types text AWT. A. Basics
Topic 9: Swing Outline Swing = Java's GUI library Swing is a BIG library Goal: cover basics give you concepts & tools for learning more Assignment 7: Expand moving shapes from Assignment 4 into game. "Programming
More informationHandling Mouse and Keyboard Events
Handling Mouse and Keyboard Events 605.481 1 Java Event Delegation Model EventListener handleevent(eventobject handleevent(eventobject e); e); EventListenerObject source.addlistener(this);
More informationCSC 1214: Object-Oriented Programming
CSC 1214: Object-Oriented Programming J. Kizito Makerere University e-mail: jkizito@cis.mak.ac.ug www: http://serval.ug/~jona materials: http://serval.ug/~jona/materials/csc1214 e-learning environment:
More informationGraphic User Interfaces. - GUI concepts - Swing - AWT
Graphic User Interfaces - GUI concepts - Swing - AWT 1 What is GUI Graphic User Interfaces are used in programs to communicate more efficiently with computer users MacOS MS Windows X Windows etc 2 Considerations
More informationCS 251 Intermediate Programming GUIs: Components and Layout
CS 251 Intermediate Programming GUIs: Components and Layout Brooke Chenoweth University of New Mexico Fall 2017 import javax. swing.*; Hello GUI public class HelloGUI extends JFrame { public HelloGUI ()
More informationRAIK 183H Examination 2 Solution. November 11, 2013
RAIK 183H Examination 2 Solution November 11, 2013 Name: NUID: This examination consists of 5 questions and you have 110 minutes to complete the test. Show all steps (including any computations/explanations)
More informationJava - Applications. The following code sets up an application with a drop down menu, as yet the menu does not do anything.
Java - Applications C&G Criteria: 5.3.2, 5.5.2, 5.5.3 Java applets require a web browser to run independently of the Java IDE. The Dos based console applications will run outside the IDE but have no access
More informationCOMPSCI 230. Software Design and Construction. Swing
COMPSCI 230 Software Design and Construction Swing 1 2013-04-17 Recap: SWING DESIGN PRINCIPLES 1. GUI is built as containment hierarchy of widgets (i.e. the parent-child nesting relation between them)
More informationCSEN401 Computer Programming Lab. Topics: Graphical User Interface Window Interfaces using Swing
CSEN401 Computer Programming Lab Topics: Graphical User Interface Window Interfaces using Swing Prof. Dr. Slim Abdennadher 22.3.2015 c S. Abdennadher 1 Swing c S. Abdennadher 2 AWT versus Swing Two basic
More informationCS 251 Intermediate Programming GUIs: Event Listeners
CS 251 Intermediate Programming GUIs: Event Listeners Brooke Chenoweth University of New Mexico Fall 2017 What is an Event Listener? A small class that implements a particular listener interface. Listener
More informationWindow Interfaces Using Swing Objects
Chapter 12 Window Interfaces Using Swing Objects Event-Driven Programming and GUIs Swing Basics and a Simple Demo Program Layout Managers Buttons and Action Listeners Container Classes Text I/O for GUIs
More informationCSE 331. Event-driven Programming and Graphical User Interfaces (GUIs) with Swing/AWT
CSE 331 Event-driven Programming and Graphical User Interfaces (GUIs) with Swing/AWT slides created by Marty Stepp based on materials by M. Ernst, S. Reges, D. Notkin, R. Mercer, Wikipedia http://www.cs.washington.edu/331/
More informationCalculator Class. /** * Create a new calculator and show it. */ public Calculator() { engine = new CalcEngine(); gui = new UserInterface(engine); }
A Calculator Project This will be our first exposure to building a Graphical User Interface (GUI) in Java The functions of the calculator are self-evident The Calculator class creates a UserInterface Class
More informationCSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University
Events and Listeners CSC 1051 Data Structures and Algorithms I Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University Course website: www.csc.villanova.edu/~map/1051/ Some slides
More informationOriginal GUIs. IntroGUI 1
Original GUIs IntroGUI 1 current GUIs IntroGUI 2 Why GUIs? IntroGUI 3 Computer Graphics technology enabled GUIs and computer gaming. GUI's were 1985 breakout computer technology. Without a GUI there would
More informationGraphical User Interfaces (GUIs)
CMSC 132: Object-Oriented Programming II Graphical User Interfaces (GUIs) Department of Computer Science University of Maryland, College Park Model-View-Controller (MVC) Model for GUI programming (Xerox
More informationCS111: PROGRAMMING LANGUAGE II
CS111: PROGRAMMING LANGUAGE II Computer Science Department Lecture 10(b): Working with Controls Agenda 2 Case study: TextFields and Labels Combo Boxes buttons List manipulation Radio buttons and checkboxes
More informationJonathan Aldrich Charlie Garrod
Principles of Software Construction: Objects, Design, and Concurrency (Part 3: Design Case Studies) Introduction to GUIs Jonathan Aldrich Charlie Garrod School of Computer Science 1 Administrivia Homework
More informationIntroduction to Graphical User Interfaces (GUIs) Lecture 10 CS2110 Fall 2008
Introduction to Graphical User Interfaces (GUIs) Lecture 10 CS2110 Fall 2008 Announcements A3 is up, due Friday, Oct 10 Prelim 1 scheduled for Oct 16 if you have a conflict, let us know now 2 Interactive
More informationCHAPTER 2. Java Overview
Networks and Internet Programming (0907522) CHAPTER 2 Java Overview Instructor: Dr. Khalid A. Darabkh Objectives The objectives of this chapter are: To discuss the classes present in the java.awt package
More informationJApplet. toy example extends. class Point { // public int x; public int y; } p Point 5.2. Point. Point p; p = new Point(); instance,
35 5 JApplet toy example 5.1 2 extends class Point { // public int x; public int y; Point x y, 5.2 Point int Java p Point Point p; p = new Point(); Point instance, p Point int 2 36 5 Point p = new Point();
More informationSolution register itself
Observer Pattern Context: One object (the Subject) is the source of events. Other objects (Observers) want to know when an event occurs. Or: several objects should be immediately updated when the state
More informationJava Applets / Flash
Java Applets / Flash Java Applet vs. Flash political problems with Microsoft highly portable more difficult development not a problem less so excellent visual development tool Applet / Flash good for:
More informationModule 5 The Applet Class, Swings. OOC 4 th Sem, B Div Prof. Mouna M. Naravani
Module 5 The Applet Class, Swings OOC 4 th Sem, B Div 2016-17 Prof. Mouna M. Naravani The layout manager helps lay out the components held by this container. When you set a layout to null, you tell the
More informationWindow Interfaces Using Swing Objects
Chapter 12 Window Interfaces Using Swing Objects Event-Driven Programming and GUIs Swing Basics and a Simple Demo Program Layout Managers Buttons and Action Listeners Container Classes Text I/O for GUIs
More informationExtra Credit Lab. Your job is to catch any syntax errors a user might make. Two examples follow. In the panel on the left the user has used
Extra Credit Lab The object of this lab is to write an applet that will take a string and check to see that it is a well defined polynomial in x. A polynomial in x, recall, is an expression of the form
More informationControl Flow: Overview CSE3461. An Example of Sequential Control. Control Flow: Revisited. Control Flow Paradigms: Reacting to the User
CSE3461 Control Flow Paradigms: Reacting to the User Control Flow: Overview Definition of control flow: The sequence of execution of instructions in a program. Control flow is determined at run time by
More informationHanley s Survival Guide for Visual Applications with NetBeans 2.0 Last Updated: 5/20/2015 TABLE OF CONTENTS
Hanley s Survival Guide for Visual Applications with NetBeans 2.0 Last Updated: 5/20/2015 TABLE OF CONTENTS Glossary of Terms 2-4 Step by Step Instructions 4-7 HWApp 8 HWFrame 9 Never trust a computer
More informationDM550 / DM857 Introduction to Programming. Peter Schneider-Kamp
DM550 / DM857 Introduction to Programming Peter Schneider-Kamp petersk@imada.sdu.dk http://imada.sdu.dk/~petersk/dm550/ http://imada.sdu.dk/~petersk/dm857/ GRAPHICAL USER INTERFACES 2 HelloWorld Reloaded
More informationIntroduction to the JAVA UI classes Advanced HCI IAT351
Introduction to the JAVA UI classes Advanced HCI IAT351 Week 3 Lecture 1 17.09.2012 Lyn Bartram lyn@sfu.ca About JFC and Swing JFC Java TM Foundation Classes Encompass a group of features for constructing
More informationName Section. CS 21a Introduction to Computing I 1 st Semester Final Exam
CS a Introduction to Computing I st Semester 00-00 Final Exam Write your name on each sheet. I. Multiple Choice. Encircle the letter of the best answer. ( points each) Answer questions and based on the
More informationRAIK 183H Examination 2 Solution. November 10, 2014
RAIK 183H Examination 2 Solution November 10, 2014 Name: NUID: This examination consists of 5 questions and you have 110 minutes to complete the test. Show all steps (including any computations/explanations)
More information