Java 2 Help Essay

Submitted By sassiekassie29
Words: 977
Pages: 4
Open Document
Gaddis, T. (2011). Starting Out with Java (4th ed.). : Addison-Wesley.

Java Helps

Javax.swing = Swing is the lite version
Java.awt = AWT (Abstract Windowing Toolkit) is the heavyweight version
JOptionPane class allows you to quickly display a dialog box showMessageDialog = display a message dialog
Method
Description void showMessageDialog(Component parent, Object message

This method displays a message dialog. The argument passed into parent is a reference to the graphical component that the dialog box should be displayed within. If you pass null to this parameter, the dialog box appears in the center of the screen. The object passed to the message parameter contains the message that is to be displayed. void showMessageDialog(Component parent, Object message, String title, int messageType)

This method displays a message dialog. The argument passed into parent is a reference to the graphical component that the dialog box should be displayed within. If you pass null to this parameter, the dialog box appears in the center of the screen. The object passed to the message parameter contains the message to be displayed. The string passed to the title parameter is displayed in the dialog box’s title bar. The value passed to messageType indicates the type of icon to display in the message box.

JOptionPane.showMessageDialog(null, "Hello World");
In this statement we pass null as the first argument. This causes the dialog box to be displayed in the center of the screen.

Notice that by default the dialog box in Figure 11-3 has the string “Message” displayed in its title bar, and an information icon (showing the letter “i”) is displayed. You can control the text displayed in the title bar and the type of icon displayed with the second version of the showMessageDialog method. Here is an example:
JOptionPane.showMessageDialog(null, "Invalid Data", "My Message Box", JOptionPane.ERROR_MESSAGE);

In this method call, the third argument is a string displayed in the dialog box’s title bar. The fourth argument is a constant that specifies the type of message being displayed, which determines the type of icon that appears in the dialog box. The constant JOptionPane.ERROR_MESSAGE specifies that an error icon is to be displayed.

The constants that you may use for the message type are JOptionPane.ERROR_MESSAGE, JOptionPane.INFORMATION_MESSAGE, JOptionPane.WARNING_MESSAGE, JOptionPane. QUESTION_MESSAGE, and JOptionPane.PLAIN_MESSAGE. The following statements call the method with each type of message.
// Display an error message.
JOptionPane.showMessageDialog(null, "Error Message", "Error", JOptionPane.ERROR_MESSAGE);
// Display an information message.
JOptionPane.showMessageDialog(null, "Information Message", "Information", JOptionPane.INFORMATION_MESSAGE);
// Display a warning message.
JOptionPane.showMessageDialog(null, "Warning Message", "Warning", JOptionPane.WARNING_MESSAGE);
// Display a question message.
JOptionPane.showMessageDialog(null, "Question Message", "Question", JOptionPane.QUESTION_MESSAGE);
// Display a plain message.
JOptionPane.showMessageDialog(null, "Plain Message", "Message", JOptionPane.PLAIN_MESSAGE);

The JFC, AWT, and Swing
Java programmers use the Java Foundation Classes (JFC) to create GUI applications. The JFC consists of several sets of classes, many of which are beyond the scope of this book. The two sets of JFC classes that we focus on are the AWT and Swing classes. First, we discuss the differences between these two.
Java has been equipped, since its
Show More

Related Documents: Java 2 Help Essay

Essay about Introduction to java

What is Java? Part 2 1. A Java Virtual Machine (JVM) is a program that executes other programs which contain Java bytecode instructions. It works by converting Java bytecode into machine language and executing it. The JVM runs the user’s or other peoples’ code on the computer. 3. 1) Create a class 2)Write the code 3)Compile 4) Run 4. .class (compiled class file), .java (Java language file), .jar (Java classes archive file), .jsp (Java Server Page file) 5. JDK is the Java Development Kit…

Words 376 - Pages 2

Essay on Programming Language and Pearson Education

Chapter 1 Introduction Java Software Solutions Foundations of Program Design 8th Edition John Lewis William Loftus Copyright © 2014 Pearson Education, Inc. Focus of the Course • Object-Oriented Software Development – problem solving – program design, implementation, and testing – object-oriented concepts • • • • • classes objects encapsulation inheritance polymorphism – graphical user interfaces – the Java programming language Copyright © 2014 Pearson Education, Inc. Instructor • • • • Bruce…

Words 1840 - Pages 8

Oracle: 10 Best Practices For Integrating Software

Oracle is finding itself caught up in another Java-related patent lawsuit, but this time it's the one getting sued. Java middleware vendor Thought filed suit against Oracle on Oct. 31, claiming that WebLogic Server and other Oracle products infringe at a "massive scale" on a number of patents it holds. FEATURED RESOURCE PRESENTED BY SCRIBE SOFTWARE 10 Best Practices for Integrating Data Data integration is often underestimated and poorly implemented, taking time and resources. Yet it…

Words 570 - Pages 3

Nt1310 Unit 3 Assignment 1

Task 1.2 Attributes 6 Task 1.3 Inheritance 8 TASK 2 11 Task 2.1 Class Diagram 11 Task 2.2 CRC Diagram 12 Task 2.3 Calculator Application 13 CONCLUSION 16 BIBLIOGRAPHY 17 INTRODUCTION In this assignment there will be discussed what encapsulation means and an example will be given on what it looks like, there is also three attributes that will be discussed and explained. In this assignment there will be a program written about…

Words 1121 - Pages 5

Essay on Texting: Computer Program and Threads

Introduction to Java threads Presented by developerWorks, your source for great tutorials ibm.com/developerWorks Table of Contents If you're viewing this document online, you can click any of the topics below to link directly to that section. 1. About this tutorial....................................................... 2. Thread basics ........................................................... 3. A thread's life............................................................ 4. Threads everywhere…

Words 1783 - Pages 8

Internet Explorer and Market Share Essay

competitive threats and opportunities in the past? What patterns do you see? There are four skirmishes that illustrate how Microsoft had responded to competitive threats and opportunities in the past – 1) Application Software (Word perfect and Lotus 1-2-3) – Microsoft typically entered markets when it realized potential of control. The second time IBM asked Gates to build them an OS, Gates saw potential, believing that the OS would become a standard that other manufacturers could use as well. Microsoft…

Words 1635 - Pages 7

Nt1330 Unit 3 Network Analysis

gateway using modern web browser and identifies himself or herself to the gateway by using an authentication method which supports the gateway 2. SSL VPN Tunnel: In this type of SSL VPN, the end user securely connected to the multiple network services through the tunnel running under SSL. It requires the web browser to handle active content such as Java, JavaScript, Active X, Flash applications or plug-ins, and it enables the user to access more functionalities that is not accessible to SSL Portal…

Words 937 - Pages 4

Programming Fundamentals Essay

2 Programming Fundamentals 6 Chapter 2: Programming Fundamentals Self-review Questions 2.1 Explain the meaning of piece.forward();. Why is the semicolon present? The object referred to by piece is instructed to move forward. Actually, to be more precise: the method forward is called for the object referenced by piece. The actual movement made by the piece depends on how it interprets an invocation of the method forward—in the examples given in the chapter a piece will move one…

Words 5217 - Pages 21

Nt1310 Unit 3 Assignment 1 Personal Response

skills I have learned up to this point. This project allowed me to work on something I can be proud of. I would say the biggest help on this project came from the programming experience I obtained through classes on programming. In our project we used Java, which is what I have learned the most here at Stockton. Hence, the past programming assignments and projects that used Java prepared me for this project. Some useful information I obtained pertaining…

Words 1055 - Pages 5

Software Engineering and Web Server Mysql Essay

regulations are also addressed. The human resources and time needed for the development is analysed. So is possible training for resources depending on the technology that is to be used. Describe the purposde of this document. Describe what it contains. 2. SCOPE 2.1 Identification Business Specification Document 001- Version 1 Identification of this document (name, number, revision) 2.2 Bounds The system is essentially a data processing and analytics system. It maintains all the records of…

Words 626 - Pages 3