Hello I'm having trouble extending JPanel. I know how to extend JFrame but my assignment calls for JPanel. Here is what I have:
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Guess extends JPanel {
private int number, guessCount;
private int lastDistance;
private JTextField guessInput;
private JLabel prompt1, prompt2, message;
private JButton newGame;
private Color background;
// set up GUI and initialize values
public Guess() {
setLayout(new FlowLayout());
guessCount = 0;
background = Color.white;
// create GUI components
prompt1 = new JLabel("I have a number between 1 and 1000.");
this.add(prompt1);
prompt2 = new JLabel("Can you guess my number? Enter your Guess:");
add(prompt2);
guessInput = new JTextField(5);
guessInput.addActionListener(new GuessHandler());
add(guessInput);
message = new JLabel("Guess result appears here.");
add(message);
// button starts a new game
newGame = new JButton("New Game");
add(newGame);
newGame.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e) {
/*
* A JButton should be provided to allow the user to play the
* game again. When the JButton is clicked, a new random number
* should be generated and the input JTextField changed to be
* editable.
*/
message.setText("Guess Result");
guessInput.setText("");
guessInput.setEditable(true);
background = Color.white;
theGame();
repaint();
}
}
);
theGame();
}
// choose a new random number
public void theGame() {
number = (int) (Math.random() * 1000 + 1);
guessCount = 0;
}
// change background color
public void paint(Graphics g) {
super.paint(g);
setBackground(background);
}
// react to new guess
public void react(int guess) {
guessCount++;
int currentDistance = 1000;
// first guess
if (guessCount == 1) {
lastDistance = Math.abs(guess - number);
if (guess > number)
message.setText("Too High. Try a lower number.");
else
message.setText("Too Low. Try a higher number.");
} else {
currentDistance = Math.abs(guess - number);
// guess is too high
if (guess > number) {
message.setText("Too High. Try a lower number.");
background = (currentDistance <= lastDistance) ? Color.red
: Color.blue;
lastDistance = currentDistance;
}
// guess is too low
else if (guess < number) {
message.setText("Too Low. Try a higher number.");
background = (currentDistance <= lastDistance) ? Color.red
: Color.blue;
lastDistance = currentDistance;
}
// guess is correct
else {
/*
* When the user gets the correct answer, “Correct!” should be
* displayed, and the JTextField used for input should be
* changed to be uneditable.
*/
message.setText("Correct!");
guessInput.setEditable(false);
setBackground(Color.white);
}
repaint();
}
} // end method react
public static void main(String args[]) {
JFrame myFrame = new JFrame("Guess My Number!!");
JPanel Guess = new JPanel();
myFrame.add(Guess);
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.setSize( 400, 400 ); // set frame size
myFrame.setVisible( true ); // display frame
}
// inner class acts on user input
class GuessHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
int guess = Integer.parseInt(guessInput.getText());
react(guess);
guessInput.selectAll();
}
}
}I really appreciate it.
