Add a KeyListener to JTextField

Question

Hello:
I got some questions to ask you.
1) How to add a KeyListener to a JTextField, and I'd like to known how
to use System.out.println to print out the values which are from keyBoard?
2) How to put the JTextField in the middle of the JFrame?
import javax.swing.*;
import java.awt.*;
public class TestKeyListener extends JFrame{
     private static TestKeyListener tKL;
     private static JTextField jTF;
     private static Container c;
     private static GridLayout gL;
     public static void main(String [] args){
          tKL=new TestKeyListener();
          tKL.setVisible(true);
     public TestKeyListener(){
          setSize(400,400);
          setTitle("TestKeyListener");
          jTF=new JTextField();
          gL=new GridLayout(10,1);
          c=getContentPane();
          c.setLayout(gL);
          setUp();
     private void setUp(){
     c.add(jTF);

Answer 1

hello,
try this
1) jTF.addKeyListener (new KeyListener ()
public void keyPressed (KeyEvent keye)
// your other codes goes here
// to print out the text in the textfield see code below
String printout = jTF.getText();
System.out.println (printout);
Note: there are more methods of the KeyListener such as keyReleased e.t.c pls bwrosed through the documentation for the jdk version u are using to get more of those methods.
2) u can simply use borderlayout to add the textfield to the center of the frame
frame.getContentPane().add (jTF, BorderLayout.CENTER);
of if it is an awt frame
frame.add(jTF, BorderLayout.CENTER);
Note that ActionListener works for JTextFields as well by pressing the enter key on your keyboard.
I hope this helps
Cheers