Java: TextDemo
Giải phóng thời gian, khai phóng năng lực
/* TextDemo.java không yêu cầu sử dụng tập tin nào */ import java.awt.*; import java.awt.event.*; import javax.swing.*; public class TextDemo extends JPanel implements ActionListener { protected JTextField textField; protected JTextArea textArea; private final static String newline = "\n"; public TextDemo() { super(new GridBagLayout()); textField = new JTextField(20); textField.addActionListener(this); textArea = new JTextArea(5, 20); textArea.setEditable(false); JScrollPane scrollPane = new JScrollPane(textArea); //Add Components to this panel. GridBagConstraints c = new GridBagConstraints(); c.gridwidth = GridBagConstraints.REMAINDER; c.fill = GridBagConstraints.HORIZONTAL; add(textField, c); c.fill = GridBagConstraints.BOTH; c.weightx = 1.0; c.weighty = 1.0; add(scrollPane, c); } public void actionPerformed(ActionEvent evt) { String text = textField.getText(); textArea.append(text + newline); textField.selectAll(); //Make sure the new text is visible, even if there //was a selection in the text area. textArea.setCaretPosition(textArea.getDocument().getLength()); } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event dispatch thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("TextDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Add contents to the window. frame.add(new TextDemo()); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event dispatch thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }
Giải phóng thời gian, khai phóng năng lực