Help with On key press and Frame

Question

Hi everybody,
I have been trying to make this work but not able to. It would be of great help if u can tell where i am going wrong. Here is my code ( it is prety small) :
I am trying to draw a random line when i do a keypress on the text field.
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class KeyPress extends Frame{
Label label;
TextField txtField;
public static void main(String[] args) {
KeyPress k = new KeyPress();
public KeyPress(){
super("Key Press Event Frame");
Panel panel = new Panel();
label = new Label();
txtField = new TextField(20);
txtField.addKeyListener(new MyKeyListener());
add(label, BorderLayout.NORTH);
panel.add(txtField, BorderLayout.CENTER);
add(panel, BorderLayout.CENTER);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we){
System.exit(0);
setSize(400,400);
setVisible(true);
public class MyKeyListener extends KeyAdapter{
public void keyPressed(KeyEvent ke){
char i = ke.getKeyChar();
String str = Character.toString(i);
label.setText(str);
Line2D myLine = new Line2D.Double(5,5,100,100);
}

Answer 1

Here's what I come up when I played with your code.
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.Random;
public class KeyPress extends Frame {
    TextField txtField;
    Panel panel;
    public static void main(String[] args) {
        KeyPress k = new KeyPress();
    public KeyPress(){
        super("Key Press Event Frame");
        panel = new myCanvass();
        txtField = new TextField(20);
        txtField.addKeyListener(new MyKeyListener());
        panel.setBackground(Color.LIGHT_GRAY);
        add(txtField, BorderLayout.PAGE_END);
        add(panel, BorderLayout.CENTER);
        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent we){
                System.exit(0);
        setSize(400,400);
        setVisible(true);
    class myCanvass extends Panel {
        private Graphics2D g2;
        public void paint(Graphics g) {
            drawLine(g);
        private void drawLine(Graphics g) {
            g2 = (Graphics2D) g;
            g2.setColor(Color.RED);
            g2.draw(new Line2D.Double(Math.random() * 150, Math.random() * 150, Math.random() * 200, Math.random() * 200));
    class MyKeyListener extends KeyAdapter{
        public void keyPressed(KeyEvent ke){
            char i = ke.getKeyChar();
            String str = Character.toString(i);
            panel.repaint();
}