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//////////////////Java Programming help////////////////////////////

Write a program that that displays a dialog box show a message and a randomly chosen color. This random color is to be used as the background color of a JFrame window which should appear after “OK” is selected. The window should ask your name and thank you for playing once “Enter” is pressed.

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Include

*JFrame Class *Java Components *JLabel Components *Component Listeners *Inner Classes *JButton Components *Dialog Boxes and JOptionPane Class *Color

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Utilize showMessageDialog to output the message shown in the sample at the bottom. A random color should be output with each run Upon clicking OK Create a JFrame window o Set the background and label text color as shown in sample below o Include a label asking to enter name (see sample) o Include a textfield to get input for name (see sample) o Upon hitting “Enter” on the keyboard, output thank you message to include the name entered as per sample at bottom Use an inner class for the listener Mimic the same session precisely. Pay attention to colors of the window and label.

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Sample Output

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I have the code and it works there is just some slight things I'm not sure how to add.

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;

public class LiFiUnit7Ch17 extends JFrame
{
private static final int WIDTH = 300; // width
private static final int HEIGHT = 200; // height
JLabel label; // label to ask for name
JTextField textField; // textbox for prompt
   JFrame frame; // frame for title

public LiFiUnit7Ch17(Color color, Color fontColors) {
setLayout(new FlowLayout()); // Layout
label = new JLabel("What is your name: "); // prompt
Container con = getContentPane();
setDefaultCloseOperation(EXIT_ON_CLOSE); // close when hit X
con.setBackground(color);
con.add(label);
label.setForeground(fontColors); // forground
textField = new JTextField(15); // text box
con.add(textField);
textField.addActionListener(new ButtonListener()); // button listener
setSize(WIDTH, HEIGHT);
setVisible(true);
}

public static void main(String[] args)
   {
LiFiUnit7Ch17 myFrame = null;
Random r = new Random();
int rand = r.nextInt(5); // chosen at random 0 - 4
String colorText = ""; // This string is used to display the selected color name
if (rand == 0) // random selector for 0 - 4 of colors, if else statements
{
myFrame = new LiFiUnit7Ch17(Color.GREEN, Color.BLUE); // constructor
colorText = "Green";
} else if (rand == 1) {
myFrame = new LiFiUnit7Ch17(Color.RED, Color.WHITE);
colorText = "Red";
} else if (rand == 2) {
myFrame = new LiFiUnit7Ch17(Color.WHITE, Color.BLACK);
colorText = "White";
} else if (rand == 3) {
myFrame = new LiFiUnit7Ch17(Color.BLUE, Color.WHITE);
colorText = "Blue";
} else if (rand == 4) {
myFrame = new LiFiUnit7Ch17(Color.YELLOW, Color.BLACK);
colorText = "Yellow";
} // end ifs
if (myFrame != null) {
JOptionPane.showMessageDialog(null, "The following window color will be randomly chosen from Red, White, Yellow, Green, Blue Your color will be " + colorText); // give random color
}

}

private class ButtonListener implements ActionListener { // inner class for event handling
public void actionPerformed(ActionEvent e) { // action event
{
               JFrame frame = new JFrame("Color changing frame"); // this doesn't work????
String message; // personalized message
message = "Thanks for playing " + textField.getText(); // gets the name entered
textField.setText("");
textField.setVisible(false);
label.setText(message);
} // end action performed
} // end inner

}
} // end class

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1. The title of the second window should be 'Color Changing Frame' using JFrame I assume?(First time working with it so not entirely sure.)

2. The second window should pop up after hitting the OK button. (Second one is the color ones) But in my code they both pop up at once.

comments are appreciated but not required.

Message i) The following window color will be randomly chosen from Red, White, Yellow, Green, Blue Your color will be: GREEN OK.

Explanation / Answer

So, both of these questions are solved in the below code. Search for the lines written as "Ans1" and "Ans2". There are 2 comments for Ans1 and Ans2 both. Here is the source code:

Source Code:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
public class LiFiUnit7Ch17 extends JFrame
{
private static final int WIDTH = 300; // width
private static final int HEIGHT = 200; // height
JLabel label; // label to ask for name
JTextField textField; // textbox for prompt
JFrame frame; // frame for title
public LiFiUnit7Ch17(Color color, Color fontColors) {
setLayout(new FlowLayout()); // Layout
//Ans1
setTitle("Color changing frame");
label = new JLabel("What is your name: "); // prompt
Container con = getContentPane();
setDefaultCloseOperation(EXIT_ON_CLOSE); // close when hit X
con.setBackground(color);
con.add(label);
label.setForeground(fontColors); // forground
textField = new JTextField(15); // text box
con.add(textField);
textField.addActionListener(new ButtonListener()); // button listener
setSize(WIDTH, HEIGHT);
//Ans2 : comment the below 1 line..
// setVisible(true);
}
public static void main(String[] args)
{
LiFiUnit7Ch17 myFrame = null;
Random r = new Random();
int rand = r.nextInt(5); // chosen at random 0 - 4
String colorText = ""; // This string is used to display the selected color name
if (rand == 0) // random selector for 0 - 4 of colors, if else statements
{
myFrame = new LiFiUnit7Ch17(Color.GREEN, Color.BLUE); // constructor
colorText = "Green";
} else if (rand == 1) {
myFrame = new LiFiUnit7Ch17(Color.RED, Color.WHITE);
colorText = "Red";
} else if (rand == 2) {
myFrame = new LiFiUnit7Ch17(Color.WHITE, Color.BLACK);
colorText = "White";
} else if (rand == 3) {
myFrame = new LiFiUnit7Ch17(Color.BLUE, Color.WHITE);
colorText = "Blue";
} else if (rand == 4) {
myFrame = new LiFiUnit7Ch17(Color.YELLOW, Color.BLACK);
colorText = "Yellow";
} // end ifs
if (myFrame != null) {
JOptionPane.showMessageDialog(null, "The following window color will be randomly chosen from Red, White, Yellow, Green, Blue Your color will be " + colorText); // give random color
//Ans2 add this line
myFrame.setVisible(true);
}
}

private class ButtonListener implements ActionListener { // inner class for event handling
public void actionPerformed(ActionEvent e) { // action event
{
//Ans1.. removed the "Color changing frame" from the below line.
JFrame frame = new JFrame(); // this doesn't work????
String message; // personalized message
message = "Thanks for playing " + textField.getText(); // gets the name entered
textField.setText("");
textField.setVisible(false);
label.setText(message);
frame.setVisible(true);
} // end action performed
} // end inner

}
} // end class

Description:

Here, as you asked in the first, the title of the second window i.e. the frame should be "Color Changing Frame". So, I added it inside the constructor of that class LiFiUnit7Ch17 which is extending JFrame. So, this frame will have a setTitlle() method which I have used to set its title. The same line is written in the actionPerformed() method, but it is not required. So, if you wish, you can remove that.

The second part is to display the frame after pressing OK button. To do that, I first removed the setVisible(true) from the constructor and instead of that, I re wrote it at the place where JOptionPane is displayed , after that this frame should be visible.

Please comment if there is any query. Thank you. :)

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