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JTextField supports the standard clipboard actions of cut, paste, and copy These can be utilized through standard keyboard editing commands, such as CTRL-X, CTRL-V, and CTRL-C in the Windows environment They can also be actuated under program control, as this example illustrates The program displays a text field, three buttons, and two labels The buttons are called Cut, Paste, and Copy, and they perform the functions indicated by their names For example, if text has been selected in the text field, then pressing Cut causes the selected text to be removed and put into the clipboard Pressing Paste causes any text in the clipboard to be copied to the text field at the current caret location Pressing Copy copies the selected text into the clipboard but does not remove it The two labels display the current contents of the text field and the currently selected text, if any
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// Cut, paste, and copy in a JTextField under program control import import import import javaawt*; javaawtevent*; javaxswing*; javaxswingevent*;
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class CutCopyPaste { JLabel jlabAll; JLabel jlabSelected; JTextField jtf; JButton jbtnCut; JButton jbtnPaste; JButton jbtnCopy; public CutCopyPaste() { // Create a JFrame container JFrame jfrm = new JFrame("Cut, Copy, and Paste"); // Specify FlowLayout for the layout manager jfrmsetLayout(new FlowLayout()); // Give the frame an initial size jfrmsetSize(230, 150); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create the labels jlabAll = new JLabel("All text: "); jlabSelected = new JLabel("Selected text: "); jlabAllsetPreferredSize(new Dimension(200, 20)); jlabSelectedsetPreferredSize(new Dimension(200, 20)); // Create the text field jtf = new JTextField(15); // Create the Cut, Paste, and Copy buttons jbtnCut = new JButton("Cut"); jbtnPaste = new JButton("Paste"); jbtnCopy = new JButton("Copy"); // Add action listener for the Cut button jbtnCutaddActionListener(new ActionListener() { public void actionPerformed(ActionEvent le) { // Cut any selected text and put it // in the clipboard jtfcut(); update(); } }); // Add action listener for the Paste button jbtnPasteaddActionListener(new ActionListener() { public void actionPerformed(ActionEvent le) { // Paste text from the clipboard into // the text field
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jtfpaste(); update(); } }); // Add action listener for the Copy button jbtnCopyaddActionListener(new ActionListener() { public void actionPerformed(ActionEvent le) { // Put selected text into the clipboard jtfcopy(); update(); } }); // Add a caret listener This lets the application // respond in real time to changes in the text field jtfaddCaretListener(new CaretListener() { public void caretUpdate(CaretEvent ce) { update(); } }); // Add the components to the content pane jfrmadd(jtf); jfrmadd(jbtnCut); jfrmadd(jbtnPaste); jfrmadd(jbtnCopy); jfrmadd(jlabAll); jfrmadd(jlabSelected); // Display the frame jfrmsetVisible(true); } // Show the complete and selected text in jtf private void update() { jlabAllsetText("All text: " + jtfgetText()); if(jtfgetSelectedText() != null) jlabSelectedsetText("Selected text: " + jtfgetSelectedText()); else jlabSelectedsetText("Selected text: "); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new CutCopyPaste(); } }); } }
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Sample output is shown here:
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As explained, each time the caret changes position, a caret event is generated, which causes the caretUpdate( ) method specified by CaretListener to be called This method is passed a CaretEvent object that encapsulates the event CaretEvent defines two methods that can be useful in some text entry situations They are shown next: int getDot( ) int getMark( ) The getDot( ) method returns the current location of the caret This is called the dot The getMark( ) method returns the beginning point of a selection This is called the mark Thus, a selection is bound by the mark and the dot If no selection has been made, then the dot and mark will be the same value You can position the caret under program control by calling setCaretPosition( ) on the text field It is shown here: void setCaretPosition(int newLoc) You can select a portion of text under program control by calling moveCaretPosition( ) on the text field It is shown next: void moveCaretPosition(int newLoc) The text between the original caret location and the new position is selected There is a very useful subclass of JTextField called JFormattedTextField It enables you to enforce a specific format for the text that is being entered For example, you can create formats for date, time, and numeric values You can also create custom formats If you want to provide a text field into which the user enters a password, then you should use JPasswordField It is designed expressly for obtaining passwords because the characters entered by the user are not echoed Rather, a placeholder character is displayed Also, the standard cut and copy editing functions are disabled in a JPasswordField JTextField allows only one line of text to be entered To allow the input of multiple lines, you must employ a different text component The easiest-to-use multiline text component is JTextArea It works much like JTextField but allows multiple lines of text There are two other text components that will be of interest to some readers: JEditorPane and JTextPane These are substantially more sophisticated controls because they support the editing of styled documents, such as those that use HTML or RTF They can also contain images and other components
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