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if(iegetStateChange() == ItemEventSELECTED) jlabChangesetText("Selection change: " + cbgetText() + " selected"); else jlabChangesetText("Selection change: " + cbgetText() + " cleared"); // Build a string that contains all selected languages if(jcbFrenchisSelected()) opts += "French "; if(jcbGermanisSelected()) opts += "German "; if(jcbChineseisSelected()) opts += "Chinese "; // Show "None" if no language is selected if(optsequals("")) opts = "None"; // Display the currently selected options jlabWhatsetText("Translate to: " + opts); }
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public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new CBDemo(); } }); } }
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The output is shown here:
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As mentioned, you can select a check box under program control by calling setSelected( ) To try this, add this line of code after adding the item listener for jcbTranslate:
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jcbTranslatesetSelected(true);
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This causes the Translate check box to be initially checked It also causes an ItemEvent to fire This results in the language options being enabled when the window is first displayed (Remember, an ItemEvent is fired each time the check box changes, whether under program control or by the user)
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8:
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Like all Swing buttons, check boxes offer a rich array of options and features that let you easily create a custom look For example, you can substitute an icon that will replace the small box that holds the check mark You can also specify both the icon and a string Here are the JCheckBox constructors that support these options: JCheckBox(Icon icon) JCheckBox(String str, Icon icon) Here, the default icon used by the check box is specified by icon Typically, this icon serves as the unchecked icon That is, it is the icon shown when the box is unchecked Normally, when specifying this icon, you will also need to specify the checked icon To specify the checked icon, call setSelectedIcon( ), shown here: void setSelectedIcon(Icon icon) The icon passed via icon specifies the image to display when the check box is checked Because the checked and unchecked icons work together as a pair, you almost always need to specify both when you are using an icon with a check box You can specify an initial state for the check box with these constructors: JCheckBox(String str, boolean state) JCheckBox(Icon icon, boolean state) JCheckBox(String str, Icon icon, boolean state) If state is true, the check box is initially checked Otherwise, it is initially cleared You can set the alignment of the check box and the alignment of the text relative to the icon The methods that handle this are defined by AbstractButton and are setVerticalAlignment( ), setHorizontalAlignment( ), setVerticalTextPosition( ), and setHorizontalTextPosition( ) You can set a mnemonic that is shown in the check box label by calling setMnemonic( ), which is also defined by AbstractButton
Create Radio Buttons
Key Ingredients
Classes and Interfaces javaawteventActionEvent javaawteventActionListener javaxswingButtonGroup javaxswingJRadioButton Methods String getActionCommand( ) void actionPerformed(ActionEvent ae) void add(AbstractButton button) void addActionListener(ActionListener al) boolean isSelected( ) void setSelected(boolean on)
Herb Schildt s Java Prog ramming Cookbook
This recipe shows how to create and manage radio buttons Radio buttons are typically used to display a group of mutually exclusive buttons, in which only one button can be selected at any one time Thus, they provide a means for the user to select just one of two or more options For example, when buying a computer through an online store, radio buttons might be displayed to allow you to select between a laptop, handheld, or tower Radio buttons are supported by the JRadioButton class, which extends AbstractButton and JToggleButton Radio buttons are usually organized into groups, which are instances of ButtonGroup As a result, this recipe explains how to use both JRadioButton and ButtonGroup
Step-by-Step
To create and manage radio buttons involves these steps: 1 Create an instance of ButtonGroup 2 Create instances of JRadioButton 3 Add each JRadioButton instance to the ButtonGroup instance 4 Register an ActionListener for each radio button and handle the action events generated by buttons 5 To determine if a radio button is selected, call isSelected( ) If the button is selected, true is returned Otherwise, false is returned Remember, only one button in any given group can be selected at any one time 6 You can select a radio button under program control by calling setSelected( )
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