// Demonstrate a text field. 
 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
  
class JTextFieldDemo implements ActionListener { 
 
  JTextField jtf; 
  JLabel jlab;  
 
  JTextFieldDemo() { 
 
    // Create a new JFrame container. 
    JFrame jfrm = new JFrame("A Text Field Example"); 
 
    // Specify FlowLayout for the layout manager. 
    jfrm.getContentPane().setLayout(new FlowLayout()); 
 
    // Give the frame an initial size. 
    jfrm.setSize(240, 90); 
 
    // Terminate the program when the user closes the application. 
    jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
 
    // Create a text field instance. 
    jtf = new JTextField(10); 
 
    // Add an action listener for the text field. 
    jtf.addActionListener(this); 
 
    // Add the text field to the content pane. 
    jfrm.getContentPane().add(jtf);  
 
    // Create an empty text-based label. 
    jlab = new JLabel(""); 
 
    // Add the label to the frame. 
    jfrm.getContentPane().add(jlab); 
 
    // Display the frame. 
    jfrm.setVisible(true); 
  } 
 
  // Handle action events. 
  public void actionPerformed(ActionEvent ae) { 
 
    // Obtain the current text and display it in a label. 
    jlab.setText("Current contents: " + jtf.getText()); 
  } 
 
  public static void main(String args[]) { 
 
    // Create the frame on the event dispatching thread. 
    SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
        new JTextFieldDemo(); 
      } 
    }); 
 
  } 
}