Figure 5-4 Simple Swing Application in Java

Creating Data Matrix 2d barcode in Java Figure 5-4 Simple Swing Application
5
Creating DataMatrix In Java
Using Barcode encoder for Java Control to generate, create ECC200 image in Java applications.
We will define a simple Java application that displays two buttons (Figure 5-4), and responds to the user click by displaying an appropriate dialog box (Figure 5-5) However, this example can be extended to much more complicated user interfaces We will implement this application three different ways - the single listener approach, the anonymous inner class approach, and the named inner class approach
Barcode Creator In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
Figure 5-4 Simple Swing Application
Bar Code Scanner In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Figure 5-5 Dialog Window - response to event First, we will implement this program using the single listener approach We will define a single class called Simple1 This contains all the code needed for this simple example All user events (button clicks in this example - they could be menu picks or any other event) are handled by the callback actionPerformed in the single listener class SimpleListener Here's the code: Listing 5-2 Simple1java
Data Matrix ECC200 Creation In C#.NET
Using Barcode generation for VS .NET Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
Single listener
Data Matrix ECC200 Maker In .NET
Using Barcode printer for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
/* * Simple1java - an example of handling events * For this example, we implement a single ActionListener * which is then used to catch all events A series of ifs * are used to determine which object caused the event */ import javaawt*; import javaawtevent*;
Making Data Matrix ECC200 In .NET Framework
Using Barcode printer for .NET Control to generate, create DataMatrix image in .NET applications.
file:///C|/oobook/5html (9 of 44) [13/03/2003 02:55:25 }
Printing Data Matrix 2d Barcode In VB.NET
Using Barcode printer for .NET Control to generate, create ECC200 image in .NET applications.
5
Code 128C Encoder In Java
Using Barcode maker for Java Control to generate, create Code 128 Code Set B image in Java applications.
import javaxswing*; public class Simple1 { private static JFrame frame; private static JPanel myPanel; private JButton button1; private JButton button2;
Barcode Generation In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
// // // //
Data Matrix ECC200 Encoder In Java
Using Barcode printer for Java Control to generate, create DataMatrix image in Java applications.
static so main can use it panel for the contentPane Define out here to make visible to ActionListener
UCC.EAN - 128 Creation In Java
Using Barcode creation for Java Control to generate, create EAN / UCC - 13 image in Java applications.
public Simple1() // Construct, build GUI { // Create a panel myPanel = new JPanel(); // Create the buttons button1 = new JButton("Button 1"); // Create buttons button2 = new JButton("Button 2"); SimpleListener ourListener = new SimpleListener(); // Set action listener for both buttons to share button1addActionListener(ourListener); button2addActionListener(ourListener); myPaneladd(button1); myPaneladd(button2); } private class SimpleListener implements ActionListener { /* * We will use a simple inner class to implement an * ActionListener to use to get the button events We * could have instead used the Simple1 class itself to * implement ActionListener instead, but this way is * more consistent with the other examples */ public void actionPerformed(ActionEvent e) { // We will use getActionCommand to get the button // name, but we could use getSource() instead and // the if tests would then be like: // if (egetSource() == button1) etc String buttonName = egetActionCommand();
Generating UPC-A Supplement 5 In Java
Using Barcode drawer for Java Control to generate, create UCC - 12 image in Java applications.
file:///C|/oobook/5html (10 of 44) [13/03/2003 02:55:25 }
Create Uniform Symbology Specification ITF In Java
Using Barcode drawer for Java Control to generate, create USS ITF 2/5 image in Java applications.
// Adds to current JFrame
Barcode Maker In Visual C#
Using Barcode maker for .NET Control to generate, create bar code image in Visual Studio .NET applications.
5
Bar Code Encoder In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
if (buttonNameequals("Button 1")) JOptionPaneshowMessageDialog(frame, "Button 1 pressed"); else if (buttonNameequals("Button 2")) JOptionPaneshowMessageDialog(frame, "Button 2 pressed"); else JOptionPaneshowMessageDialog(frame, "Unknown event"); } } public static void main(String s[]) { Simple1 gui = new Simple1(); // Create Simple1 component frame = new JFrame("Simple1"); // JFrame for the panel // Standard idiom to catch close event frameaddWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) {Systemexit(0);} }); framegetContentPane()add(myPanel); framepack(); // Ready to go framesetVisible(true); } }
Code 128 Code Set C Scanner In .NET Framework
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
Let's go over how this code works Our simple application will consist of a Swing JFrame defined in main We will add a single JPanel to the frame The panel will contain the two JButtons The variable references to these components, frame, button1, and button2 are defined at the top level of Simple11 The main method starts by creating the Simple1 object, which then creates the user GUI by defining the JPanel and adding the JButtons After each button is created, JButtonaddActionListener is called for each button instance to add the single instance of SimpleListener Finally, each button is added to the panel After the GUI has been created, main adds the panel to the frame, and displays the results When a user clicks one of the buttons, the actionPerformed callback is called, and inside if statements are used to determine which button was pressed, and an appropriate modal dialog box is displayed The UML sequence diagram in Figure 5-6 shows the sequence of operations when a user
Creating EAN / UCC - 14 In Visual Studio .NET
Using Barcode maker for VS .NET Control to generate, create GS1-128 image in Visual Studio .NET applications.
file:///C|/oobook/5html (11 of 44) [13/03/2003 02:55:25 }
Drawing GS1 - 13 In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create EAN / UCC - 13 image in ASP.NET applications.
Code 128A Creation In C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create Code 128 Code Set B image in .NET framework applications.