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jrbFrenchsetEnabled(false); jrbGermansetEnabled(false); jrbChinesesetEnabled(false); jlabWhatsetEnabled(false); jlabChangesetText("Translation disabled"); } } }); // Changes to the language radio buttons are handled // in common by the actionPerformed() method // implemented by RBDemo jrbFrenchaddActionListener(this); jrbGermanaddActionListener(this); jrbChineseaddActionListener(this); // Add the components to the content pane jfrmadd(jcbTranslate); jfrmadd(jlabTranslateTo); jfrmadd(jrbFrench); jfrmadd(jrbGerman); jfrmadd(jrbChinese); jfrmadd(jlabChange); jfrmadd(jlabWhat); // Display the frame jfrmsetVisible(true); } // This handles all of the language radio buttons public void actionPerformed(ActionEvent ie) { // Only one button will be selected at any one time if(jrbFrenchisSelected()) jlabWhatsetText("Translate into French"); else if(jrbGermanisSelected()) jlabWhatsetText("Translate into German"); else jlabWhatsetText("Translate into Chinese"); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new RBDemo(); } }); } }
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Radio buttons support several options A few are mentioned here For example, you can substitute an icon that will replace the small circle that indicates selection You can also specify both the icon and a string Here are the JRadioButton constructors that support these options: JRadioButton(Icon icon) JRadioButton(String str, Icon icon) The default icon used by the radio button is specified by icon Typically, this icon serves as the deselected icon That is, it is the icon shown when the button is not selected Normally, when specifying this icon, you will also need to specify the selected icon To specify the selected icon, call setSelectedIcon( ), shown here: void setSelectedIcon(Icon icon) The icon passed via icon specifies the image to display when the radio button is selected Because the selected and deselected icons work together as a pair, you almost always need to specify both when you are using an icon JRadioButton also supplies constructors that let you specify an icon and initial state, as shown here: JRadioButton(Icon icon, boolean state) JRadioButton(String str, Icon icon, boolean state) If state is true, the radio button is initially selected Otherwise, it is initially deselected You can set the alignment of the radio button 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 radio button string by calling setMnemonic( )
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Classes and Interfaces javaawteventActionListener javaawteventActionEvent javaxswingeventCaretListener javaxswingeventCaretEvent javaxswingJTextField void addActionListener(ActionListener al) void addCaretListener(CaretListener cl) void cut( ) void copy( ) String getSelectedText( ) String getText( ) void paste( ) void setActionCommand(String newCmd) void setText(String text) Methods void actionPerformed(ActionEvent ae) String getActionCommand( ) void caretUpdate(CaretEvent ce)
Swing provides extensive support for text entry, supplying several components for this purpose This recipe looks at what is perhaps the most commonly used text component: JTextField It offers a simple, yet very useful service: it enables the user to enter a single line of text For example, you could use JTextField to obtain a user s name or e-mail address, a filename, or a telephone number Despite its simplicity, there are many input situations in which JTextField is exactly the right component It is an easy-to-use but effective solution to a wide variety of text input tasks Although JTextField is just one of several text components, most of the techniques that apply to it also apply to the others Thus, much of what is presented in this recipe can be adapted for use with JTextArea, JFormattedTextField, or JPasswordField, for example It is necessary to state that Swing s text components constitute a very large topic The techniques shown in this recipe represent a typical use of one component More sophisticated applications are possible
Step-by-Step
To use JTextField to input a line of text involves these steps: 1 Create a JTextField instance Make the component wide enough to handle a typical entry 2 If desired, handle action events by registering an ActionListener for the text field Action events are generated when the user presses ENTER when the text field has input focus
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