Question

JAVA

Create a simple Graphical User Interface (GUI) in java with the following requirements:

 The interface components will appear centered in the interface, and in two rows.

o Row one will have a Label that reads “Please enter a valid integer:” and a Text Field to take in the integer from the user.

o Row two will have a Button that when pressed converts the integer to binary

 The conversion will be completed using recursion – A separate recursive method will use divide by 2 then mod 2 on each digit of the integer (See below)

 The program will use either a Lambda or anonymous class to implement the Event Handler.

 The program will use the @Override annotation where appropriate.

 The program will conform to the coding conventions discussed in class.

 The program will properly handle any checked Exceptions. This assignment is intended to get you to demonstrate knowledge of basic GUI design, basic Event handling, and Recursion. Example – The integer 50 produces the binary number 110010 as follows: 50/2 = 25, 50%2 = 0 25/2 = 12, 25%2 = 1 12/2 = 6, 12%2 = 0 6/2 = 3, 6%2 = 0 3/2 = 1, 3%2 = 1 1/2 = 0, 1%2 = 1 Construct backwards from mod answers, bottom up – 110010 Please submit the assignment to the Canvas drop box by Wednesday, December 4, 2018.

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 DecToBinGUI {
  
private static JFrame mainFrame;
private static JPanel mainPanel, inpPanel, buttonPanel, resultPanel;
private static JLabel inpLabel, resultLabel;
private static JTextField decField;
private static JButton convertButton;
  
public static void main(String[] args)
{
mainFrame = new JFrame("Decimal To Binary Converter");
mainPanel = new JPanel(new GridLayout(3, 0));
  
inpPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
inpLabel = new JLabel("Please enter a valid integer: ");
decField = new JTextField(20);
inpPanel.add(inpLabel);
inpPanel.add(decField);
  
buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
convertButton = new JButton("Convert");
buttonPanel.add(convertButton);
  
resultPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
resultLabel = new JLabel("Result: ");
resultPanel.add(resultLabel);
  
mainPanel.add(inpPanel);
mainPanel.add(buttonPanel);
mainPanel.add(resultPanel);
  
mainFrame.add(mainPanel);
mainFrame.setSize(450, 180);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setLocationRelativeTo(null);
mainFrame.setVisible(true);
  
// add action listener for the convert button
ConvertButtonListener listener = new ConvertButtonListener();
convertButton.addActionListener(listener);
}
  
static class ConvertButtonListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e) {
if(decField.getText().equals(""))
JOptionPane.showMessageDialog(null, "Please enter a decimal number to convert!");
else
{
String decInp = decField.getText().trim();
int decimal = Integer.parseInt(decInp);
resultLabel.setText("Result: " + decToBin(decimal) + "");
}
}
  
private String decToBin(int dec)
{
if(dec == 0)
return "0";
String bin = "";
while(dec > 0)
{
int remainder = (dec % 2);
bin = remainder + bin;
dec /= 2;
}
return bin;
}
}
}

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