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JTextField is the simplest Swing text component It is also probably its most widely used text component JTextField allows you to edit one line of text It is derived from JTextComponent, which provides the basic functionality common to Swing text components JTextField uses the Document interface for its model Three of JTextField s constructors are shown here: JTextField(int cols) JTextField(String str, int cols) JTextField(String str) Here, str is the string to be initially presented, and cols is the number of columns in the text field If no string is specified, the text field is initially empty If the number of columns is not specified, the text field is sized to fit the specified string JTextField generates events in response to user interaction For example, an ActionEvent is fired when the user presses ENTER A CaretEvent is fired each time the caret (ie, the cursor) changes position (CaretEvent is packaged in javaxswingevent) Other events are

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Go to this book s Web site at WebDesignDWglencoecom Click Unit Activities and select Unit 3 Evaluating Web Sites Learn how to evaluate Web sites to make sure the information is reliable

Part III:

Figure 6-9

also possible In many cases, your program will not need to handle these events Instead, you will simply obtain the string currently in the text field when it is needed To obtain the text currently in the text field, call getText( ) The following example illustrates JTextField It creates a JTextField and adds it to the content pane When the user presses ENTER, an action event is generated This is handled by displaying the text in the status window

Books and magazines often use images and color to attract readers These visual elements help make the publication interesting and exciting

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// Demonstrate JTextField import javaawt*; import javaawtevent*; import javaxswing*; /* <applet code="JTextFieldDemo" width=300 height=50> </applet> */ public class JTextFieldDemo extends JApplet { JTextField jtf; public void init() { try { SwingUtilitiesinvokeAndWait( new Runnable() { public void run() { makeGUI(); } } ); } catch (Exception exc) { Systemoutprintln("Can't create because of " + exc); } } private void makeGUI() { // Change to flow layout setLayout(new FlowLayout()); // Add text field to content pane jtf = new JTextField(15); add(jtf); jtfaddActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { // Show text when user presses ENTER showStatus(jtfgetText()); } }); } }

If you drop down to the commandAction() method, you ll see that the setConstraints() method is called, changing the constraint from ANY | PASSWORD to ANY, which causes characters placed in the text field to be displayed unchanged The MIDlet also calls the setString() method to replace the hidden content of the text field with the Thank you string

Output from the text field example is shown here:

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Look at some books or magazines Jot down the visual elements that attract you and those that make you want to put the publication down Then describe how some of the same design principles might apply to Web pages

30:

Listing 6-17 The JAD file for Listing 6-18

Swing defines four types of buttons: JButton, JToggleButton, JCheckBox, and JRadioButton All are subclasses of the AbstractButton class, which extends JComponent Thus, all buttons share a set of common traits AbstractButton contains many methods that allow you to control the behavior of buttons For example, you can define different icons that are displayed for the button when it is disabled, pressed, or selected Another icon can be used as a rollover icon, which is displayed when the mouse is positioned over a button The following methods set these icons: void setDisabledIcon(Icon di) void setPressedIcon(Icon pi) void setSelectedIcon(Icon si) void setRolloverIcon(Icon ri) Here, di, pi, si, and ri are the icons to be used for the indicated purpose The text associated with a button can be read and written via the following methods: String getText( ) void setText(String str) Here, str is the text to be associated with the button The model used by all buttons is defined by the ButtonModel interface A button generates an action event when it is pressed Other events are possible Each of the concrete button classes is examined next

Section 81 Identify types of graphics Identify and compare graphic formats Describe compression schemes Section 82 Identify image sources Use graphics ethically Insert an inline graphic Crop, resize, and resample a graphic Modify a graphic Section 83 Create an image map with hotspots Create a Web photo album Create a thumbnail

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