Question

Write an interactive Java program, ColorRange.java, which when given a wavelength in nanometers will return the corresponding color in the visible spectrum. Color Wavelength (nm) Violet 380-450 Blue 451-495 Green 496-570 Yellow 571-590 Orange 591-620 Red 621-750 Task You must implement the following using a suitable decision statement. 1. Use a GUI prompt for the user to enter the wavelength, the wavelength should be of type double. 2. For each range (e.g. 380-450) the number on the left is included in the range, but the number on the right is not included in the range. 3. If the input value is not found on the visible spectrum then state that the wavelength is not within the visible spectrum. 4. Use a GUI interface to tell the user the color that correlates with the given wavelength. Example: • Enter a color code 630, your code should return the color Red

Answer 1

import java.awt.FlowLayout;
import java.awt.GridLayout;
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.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class ColorRange {
  
private static JFrame mainFrame;
private static JPanel mainPanel, inputPanel, buttonPanel;
private static JLabel codeLabel, resLabel;
private static JTextField codeField, resField;
private static JButton submitButton;
  
public static void main(String[] args)
{
mainFrame = new JFrame("Color Range");
mainPanel = new JPanel(new GridLayout(2, 0));
  
inputPanel = new JPanel(new GridLayout(2, 2));
codeLabel = new JLabel("Enter a color code: ");
codeField = new JTextField(10);
resLabel = new JLabel("Color: ");
resField = new JTextField(10);
resField.setEditable(false);
inputPanel.add(codeLabel);
inputPanel.add(codeField);
inputPanel.add(resLabel);
inputPanel.add(resField);
  
buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
submitButton = new JButton("Submit");
buttonPanel.add(submitButton);
  
mainPanel.add(inputPanel);
mainPanel.add(buttonPanel);
  
mainFrame.add(mainPanel);
mainFrame.setSize(300, 150);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setLocationRelativeTo(null);
mainFrame.setVisible(true);
  
// listener for submit button
submitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(codeField.getText().equals(""))
{
JOptionPane.showMessageDialog(null, "Please enter a color code");
return;
}
  
String color;
int code = Integer.parseInt(codeField.getText().trim());
if(code >= 380 && code < 450)
color = "Violet";
else if(code >= 451 && code < 495)
color = "Blue";
else if(code >= 496 && code < 570)
color = "Green";
else if(code >= 571 && code < 590)
color = "Yellow";
else if(code >= 591 && code < 620)
color = "Orange";
else if(code >= 621 && code < 750)
color = "Red";
else
color = "Unknown";
  
resField.setText(color);
}
});
}
}

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Color Range - O X Enter a color code: 630 Color: Red Submit