Cobalt 60, a radioactive form of cobalt used in cancer therapy, decays or dissip

Question

Cobalt 60, a radioactive form of cobalt used in cancer therapy, decays or dissipates over a period of time. Each year, 12 percent of the amount present at the beginning of the year will have decayed. Write a Java program CConverter.java using Swing class which requests the initial amount of Cobalt 60 and n number of years, and determines the amount remaining afer n years. Your GUI should resemble the interface below:

The Javapad editor must also be implemented.

Here is the javapad editor that needs to be implemented:

import javax.swing.*;

import javax.swing.border.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

public class Javapad extends JFrame {  

private JMenuBar menuBar;

private JMenu fileMenu;

private JMenuItem n, open, save, exit;

  public Javapad() {  

super("Javapad");  

setDefaultCloseOperation(EXIT_ON_CLOSE);  

setPreferredSize(new Dimension(640, 480));  

buildGUI();   pack();  

setVisible(true);

}

class FileListener implements ActionListener {  

private JFileChooser fc;  

private JTextArea area;

public FileListener(JTextArea area) {  

fc = new JFileChooser();  

this.area = area;

}

   public void actionPerformed(ActionEvent e) {  

if(e.getSource() == open) {  

int returnVal = fc.showOpenDialog(Javapad.this);  

if (returnVal == JFileChooser.APPROVE_OPTION) {

try {  

File file = fc.getSelectedFile();  

area.setText(s);  

}  

catch (IOException exc) {  

exc.printStackTrace();  

System.exit(1);  

}

}  

}  

else if(e.getSource() == save) {  

int returnVal = fc.showSaveDialog(Javapad.this);

if (returnVal == JFileChooser.APPROVE_OPTION) {

try {

File file = fc.getSelectedFile();  

}  

catch(IOException exc) {  

exc.printStackTrace();   

System.exit(1);   }

}  

}  

}

}

  private void buildGUI() {  

Container container = this.getContentPane();
   menuBar = new JMenuBar();

   menuBar.setBorder( new BevelBorder(BevelBorder.RAISED) );  

   menuBar.setBorderPainted(true);  

   container.add(menuBar, BorderLayout.NORTH);   

   fileMenu = new JMenu("File");  

   menuBar.add(fileMenu);
   JMenuItem n = new JMenuItem("New");  

   fileMenu.add(n);  

   fileMenu.addSeparator();
   open = new JMenuItem("Open");  

   fileMenu.add(open);  

   fileMenu.addSeparator();
   save = new JMenuItem("Save");  

   fileMenu.add(save);  

   fileMenu.addSeparator();

   JMenuItem exit = new JMenuItem("Exit");  

   fileMenu.add(exit);

   JTextArea edit = new JTextArea(30,20);  

   edit.setFont(new Font("Courier", Font.PLAIN, 14));
   JScrollPane sp = new JScrollPane(edit);  

   sp.setPreferredSize(new Dimension(450, 100));  

   container.add(sp, BorderLayout.CENTER);
   FileListener fl = new FileListener(edit);  

   open.addActionListener(fl);  

   save.addActionListener(fl);
  }
  public static void main(String[] args) {   Javapad jp = new Javapad();  

}

}

Explanation / Answer

see if this is helpful:- http://flylib.com/books/en/3.29.1.43/1/

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