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Perhaps the most widely used control is the push button A push button is a component that contains a label and that generates an event when it is pressed Push buttons are objects of type Button Button defines these two constructors: Button( ) throws HeadlessException Button(String str) throws HeadlessException The first version creates an empty button The second creates a button that contains str as a label After a button has been created, you can set its label by calling setLabel( ) You can retrieve its label by calling getLabel( ) These methods are as follows: void setLabel(String str) String getLabel( ) Here, str becomes the new label for the button

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The Language Club Web site will have a hierarchical structure In the following activity, you will chart this hierarchical structure and assign pages to levels

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Each time a button is pressed, an action event is generated This is sent to any listeners that previously registered an interest in receiving action event notifications from that component Each listener implements the ActionListener interface That interface defines the actionPerformed( ) method, which is called when an event occurs An ActionEvent object is supplied as the argument to this method It contains both a reference to the button that generated the event and a reference to the action command string associated with the button By default, the action command string is the label of the button Usually, either the button reference or the action command string can be used to identify the button (You will soon see examples of each approach) Here is an example that creates three buttons labeled Yes , No , and Undecided Each time one is pressed, a message is displayed that reports which button has been pressed In this version, the action command of the button (which, by default, is its label) is used to determine which button has been pressed The label is obtained by calling the getActionCommand( ) method on the ActionEvent object passed to actionPerformed( )

int getResponseCode() String getResponseMessage()

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1 Open a blank word processing document, or take out a piece of paper At the top of the page, write or key Language Club Site Navigation Structure This is the title of your chart 2 Using the information provided in Table 53, create a chart that shows the navigation structure of the proposed Language Club site It should use a hierarchical structure with the home page at the top Figure 59 shows part of this chart Be sure to include each page s title in the corresponding box and to draw lines showing the relationships among the pages 3 Add five lower level pages (subpages) under the Events page Write appropriate page titles for these subpages (see page 148 for naming guidelines) 4 Proofread your chart Name your document Language Chart and save it according to your teacher s instructions

// Demonstrate Buttons import javaawt*; import javaawtevent*; import javaapplet*; /* <applet code="ButtonDemo" width=250 height=150> </applet> */ public class ButtonDemo extends Applet implements ActionListener { String msg = ""; Button yes, no, maybe; public void init() { yes = new Button("Yes");

24:

String getHeaderField (int n)

You have now determined the major pages for the Language Club site At this point, it is a good idea to think of appropriate names for your files In your navigation chart, you specified the title of each page However, the file in which each page is stored must also be specified

no = new Button("No"); maybe = new Button("Undecided"); add(yes); add(no); add(maybe); yesaddActionListener(this); noaddActionListener(this); maybeaddActionListener(this); } public void actionPerformed(ActionEvent ae) { String str = aegetActionCommand(); if(strequals("Yes")) { msg = "You pressed Yes"; } else if(strequals("No")) { msg = "You pressed No"; } else { msg = "You pressed Undecided"; } repaint(); } public void paint(Graphics g) { gdrawString(msg, 6, 100); } }

Sample output from the ButtonDemo program is shown in Figure 24-1 As mentioned, in addition to comparing button action command strings, you can also determine which button has been pressed, by comparing the object obtained from the

Appendix:

Choosing a Page Title A page title is not the same thing as a file name A Web page s page title (sometimes called a page name) appears in the title bar when the page is displayed in a browser Follow these guidelines when choosing a page title

FIGURE 24-1

Part II:

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