operating system’s kernel simulation in Java

Structure of the Problem Requirements 

This project aims to provide basic understanding of operating system kernel development. In this project,we build an operating system’s kernel simulation. It is divided into different phases. 

First of all, a name to your operating system and build a control panel for operating system simulation which perform the following operations.

􀂃 Process management
􀂃 Memory management
􀂃 I/O management
􀂃 Other operations

After this we create a Process Management menu. In this menu, we create buttons for the different operations that can be performed on a process. These operations are following:

Operations on a Process related to Process Management
􀂃 Create a process
􀂃 Destroy a process
􀂃 Suspend a process
􀂃 Resume a process
􀂃 Block a process
􀂃 Wakeup a process
􀂃 Dispatch a process
􀂃 Change process priority
􀂃 Process communication with other processes

Source Code

MyProcessthread.java

package riu.cms7425.ProcessManagement;
public class MyProcessthread extends Thread{
 
 String name;
        public MyProcessthread(String name){
  this.name = name;
 }
 public void run(){
  
  Resource r = new Resource();
  for(int i = 0;i<20;i++){
   System.out.println(name + "Hello world\n" + r.printer + "\n"+ r.monitor);
   try{
    this.wait(500);
   }
   catch(Exception e){
    //System.out.println("Exception :"+ e.getMessage());
   }
   }
  }

}

Process.java

package riu.cms7425.ProcessManagement;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

import javax.management.Query;
import javax.swing.JOptionPane;

public class Process {

 public ProcessControlBlock processInfo =  new ProcessControlBlock();   //information of the pcb
         public void createProcess(){
  int random = (int )(Math.random() * 50 + 1);
  processInfo.processId = random;
  String sizeProcess = (String )JOptionPane.showInputDialog(null, "Enter process size in kb : ", "Process Memory required",JOptionPane.QUESTION_MESSAGE);
  try{
   processInfo.memoryRequired = Integer.parseInt(sizeProcess); 
  }
  catch(NumberFormatException e){
   JOptionPane.showMessageDialog(null,
        "Non-integer input, so default value is used",
        "Process Size",
        JOptionPane.ERROR_MESSAGE);
  }
  
  //processInfo.memoryAddress = & ;
  processInfo.ownerProcess = "null";
  processInfo.parentProcessId = 0;
  processInfo.childProcessId = new int[0];
  processInfo.priority = "High";
  processInfo.processStatus = "new";
  //processInfo.
  
  //process table create in it insert value...
  try{
   // Create File
   Scanner fileInput=new Scanner(new File("Process Table.txt"));
   PrintWriter myFile=new PrintWriter(new FileOutputStream(new File("Process Table.txt"),true));
   //myFile.println("Process ID   ,  "+"Process status    ,   "+"Process Memory   ,   "+"Process Prority   ,   ");
   myFile.println("\n"+processInfo.processId+"             ,    "+processInfo.processStatus+"           ,      "+processInfo.memoryRequired+"              ,   "+processInfo.priority  );
   myFile.close();
  }catch(FileNotFoundException e)
  {
   try{
   PrintWriter myFile=new PrintWriter("Process Table.txt");
   myFile.println("Process ID   ,  "+"Process status    ,   "+"Process Memory   ,   "+"Process Prority");
   myFile.println("\n"+processInfo.processId+"             ,    "+processInfo.processStatus+"           ,      "+processInfo.memoryRequired+"              ,   "+processInfo.priority);
   myFile.close();
   }catch(IOException ea){}
  }
  }
 void destoryProcess() {
   
 }
 public void suspendprocess(SchedulingQueue scQ)  { 
  try{
   Process p = scQ.getProcessReadyQueue().poll();
   p.processInfo.processStatus = "Suspend";
   scQ.processSuspendQueue.add(p);
   JOptionPane.showMessageDialog(null,
        "process detail : " +  p.getProcessInfo().getProcessId() +"\n state:"
        +p.getProcessInfo().getProcessStatus(),
        "Process info",
        JOptionPane.INFORMATION_MESSAGE);
  }catch(NullPointerException nullEx){
   System.out.println("No process");
  }
 }
 
 public void resumeProcess(SchedulingQueue scQ)  { 
  try{
   Process p = scQ.getProcessSuspendQueue().poll();
   p.processInfo.processStatus = "Ready";
   scQ.processReadyQueue.add(p);
   JOptionPane.showMessageDialog(null,
        "process id : " +  p.getProcessInfo().getProcessId() +"\n state:"
        +p.getProcessInfo().getProcessStatus(),
        "Process detail",
        JOptionPane.INFORMATION_MESSAGE);
  }catch(NullPointerException nullEx){
   System.out.println("No process");
  }
 }
 
 public void blockProcess(SchedulingQueue scQ)  { 
  try{
   Process p = scQ.getProcessReadyQueue().poll();
   p.processInfo.processStatus = "block";
   scQ.processBlockQueue.add(p);
   JOptionPane.showMessageDialog(null,
        "process id : " +  p.getProcessInfo().getProcessId() +"\n state:"
        +p.getProcessInfo().getProcessStatus(),
        "Process detail",
        JOptionPane.INFORMATION_MESSAGE);
  }catch(NullPointerException nullEx){
   System.out.println("No process");
  }
 }
 
 public void wakeUpProcess(SchedulingQueue scQ)  { 
  try{
   Process p = scQ.getProcessBlockQueue().poll();
   p.processInfo.processStatus = "Ready";
   scQ.processReadyQueue.add(p);
   JOptionPane.showMessageDialog(null,
        "process id : " +  p.getProcessInfo().getProcessId() +"\n state:"
        +p.getProcessInfo().getProcessStatus(),
        "Process detail",
        JOptionPane.INFORMATION_MESSAGE);
  }catch(NullPointerException nullEx){
   System.out.println("No process");
  }
 }
 
 public void DispatchProcess(SchedulingQueue scQ,int schedulingAlgorithm){
  
  switch(schedulingAlgorithm){
   case 0:{
    try{
     Process p = scQ.processReadyQueue.poll();
     p.processInfo.processStatus = "Running";
     System.out.println(p.getProcessInfo().getProcessId() + "  "+p.getProcessInfo().getProcessMemory() + " "+p.getProcessInfo().getProcessStatus());
     JOptionPane.showMessageDialog(null,
          "process id : " +  p.getProcessInfo().getProcessId() +"\n state:"
          +p.getProcessInfo().getProcessStatus(),
          "Process detail",
          JOptionPane.INFORMATION_MESSAGE);
    }catch(NullPointerException nullEx){
      System.out.println("No process");
     }
    break;
   }
   case 1:{
    try{
     Process p = scQ.processReadyQueue.poll();
     p.processInfo.processStatus = "Running";
     System.out.println(p.getProcessInfo().getProcessId() + "  "+p.getProcessInfo().getProcessMemory() + " "+p.getProcessInfo().getProcessStatus());
     
     ProcessPage page = new ProcessPage();
     page.pageCalculate(p);
     
     if(p.getProcessInfo().getProcessMemory()  > page.getNumberofPageProcess() ){
      p.processInfo.memoryRequired =p.getProcessInfo().getProcessMemory()  - page.getPageSize() ;
      scQ.processReadyQueue.add(p);
     }
     
     
     JOptionPane.showMessageDialog(null,
          "process id : " +  p.getProcessInfo().getProcessId() +"\n state:"
          +p.getProcessInfo().getProcessStatus(),
          "Process detail",
          JOptionPane.INFORMATION_MESSAGE);
     
     
    }catch(NullPointerException nullEx){
      System.out.println("No process");
     }
    break;
   }
  }
 }
 void changeProcessPriority(){}
 
 public void communicateOtherProcess(){
  MyProcessthread th = new MyProcessthread(Integer.toString(processInfo.processId));
  MyProcessthread th1 = new MyProcessthread(Integer.toString(processInfo.processId+1));
  
  th.start();
  th1.start();
 }
 
 public ProcessControlBlock getProcessInfo(){
  return processInfo;
 }
}//end of public class Process


ProcessControlBlock.java

package riu.cms7425.ProcessManagement;

//PCB class save the info of a particular process info
public class ProcessControlBlock {

 public ProcessControlBlock(){
  memoryRequired= 64;
 }
 
  protected int processId;
  protected String processStatus;
  protected String ownerProcess;
  protected int parentProcessId;
  protected int childProcessId[];
  protected int memoryRequired;
  protected int memoryAddress;
  //Process parentProcess;
  //Process childProcess;
  protected String priority;
 
 class Resource{
  
 }//end of class Resource
 
 class Register{
  int a,b,c;
  int sum;
 }//end of class Register
 
 protected String ioDeviceStatus[];
 
 
 //*************************************getter
 public int getProcessId(){
  return processId;
 }
 
 public int getProcessMemory(){
  return memoryRequired;
 }
 
 public String getProcessStatus(){
  return processStatus;
 }
 
 //**************************************setter
 public void setProcessState(String state){
  processStatus = state;
 }
}//end of public class ProcessControlBlock


ProcessPage.java

package riu.cms7425.ProcessManagement;

import java.io.File;
import java.io.IOException;
import java.util.Scanner;

import javax.swing.JOptionPane;

public class ProcessPage {

 private int pageSize;
 private int numberOfPages;
 

 public void pageCalculate(Process process){
 // Read File
   pageSize = 4;
   try{
     Scanner fileInput=new Scanner(new File("configuartion.txt"));
     
     while (fileInput.hasNextLine())
     {
      String sReadFile = fileInput.nextLine();
      String[] pageSizeGet = sReadFile.split(":");
      pageSize = Integer.parseInt(pageSizeGet[1]);
      
     }
     fileInput.close();
   }catch(IOException ioe){
    JOptionPane.showMessageDialog(null,
         "file not found",
         "IOException",
         JOptionPane.ERROR_MESSAGE);
   }
   System.out.println(pageSize);
   
   int numberOfPages =  process.getProcessInfo().memoryRequired/pageSize;
   
   if( process.getProcessInfo().memoryRequired % pageSize  != 0){     //not complete divide then
    numberOfPages = numberOfPages +1;
   }
   System.out.println("number of pages are :"+ numberOfPages); 
   JOptionPane.showMessageDialog(null,
        "Number of page created :"+ numberOfPages+
        "\nPage size:" + pageSize,
        "Process Pages",
        JOptionPane.INFORMATION_MESSAGE);
}

//*******************************getter

int getNumberofPageProcess(){
 return numberOfPages;
}

int getPageSize(){
 return pageSize;
}

}


Resource.java

package riu.cms7425.ProcessManagement;

public class Resource {

 public Resource() {
  
 }
 
 //******name
 
 public String printer = "printer";
 public String Scanner = "scanner";
 public String monitor = "monitor";
 public String keyboard = "Keyboard";

}

SchedulingQueue.java

package riu.cms7425.ProcessManagement;

import java.util.LinkedList;
import java.util.Queue;

public class SchedulingQueue {

public Queue<Process> processCreateQueue = new LinkedList<Process>();
public Queue<Process> processReadyQueue = new LinkedList<Process>();
public Queue<Process> processSuspendQueue = new LinkedList<Process>();
public Queue<Process> processBlockQueue = new LinkedList<Process>();
 
 public Queue<Process> getProcessCreateQueue(){
  return processCreateQueue;
 }
 public Queue<Process> getProcessReadyQueue(){
  return processReadyQueue;
 }
 
 public Queue<Process> getProcessSuspendQueue(){
  return processSuspendQueue;
 }
 
 public Queue<Process> getProcessBlockQueue(){
  return processBlockQueue;
 }

}

ControlPanel.java

//name: Farzam babar
//CMS:- 7425

package riu.cms7425.GUI;

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

public class ControlPanel {
 static JFrame mainWindow = new JFrame();
 static JButton exitProgramButton = new JButton("Exit Program");
 static JPanel buttonBox = new JPanel(new GridBagLayout());
 
 public static void main(String[] args){
   
  mainWindow.setTitle("FB operating system simulation - Control Panel");
  mainWindow.setSize(550,550);
   
  mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  new MainMenu();
  
  buttonBox.setVisible(true);
  exitProgramButton.addActionListener(
   new ActionListener(){
    public void actionPerformed(ActionEvent event){
     System.exit(0);
    }//end of button action
   });//end of button action listener
  
  buttonBox.add(exitProgramButton);
  mainWindow.add(buttonBox,BorderLayout.SOUTH);
  mainWindow.setVisible(true);
 }//end of public static void main(String[] args)
}//end of public class ProgramManager 


MainMenu.java

package riu.cms7425.GUI;

import java.awt.*;

import javax.swing.*;

import riu.cms7425.ProcessManagement.SchedulingQueue;

import java.awt.event.*;
import java.io.IOException;
import java.io.PrintWriter;

public class MainMenu extends ControlPanel{
 public JPanel menuPanel = new JPanel(new GridBagLayout());
 JPanel headingPanel = new JPanel();
 
 ButtonGroup radioButtonGroup;
 
 final int managementButtonSize = 4;
 JRadioButton managementButton[] = new JRadioButton[managementButtonSize];
 String managementButtonName[] = {"Process management","Memory management","I/O device management",
          "Other Operation"};
 JButton configuartionButton = new JButton("Configuaration buttion");
 JTextArea pagesizetext;
 
 public MainMenu(){
  GridBagConstraints arrangeButton = new GridBagConstraints();
  
  JLabel meanHeading = new JLabel("Control Panel MENU");
  meanHeading.setFont(new Font("Sarif",Font.BOLD+Font.ITALIC,25));
  
  headingPanel.add(meanHeading);
  headingPanel.add(configuartionButton);
  
  
  configuartionButton.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent e) {
    
    final JFrame configuration_frame = new JFrame("Configuration");
    configuration_frame.setSize(250,250);
    configuration_frame.setVisible(true);
  
    JLabel heading = new JLabel("Program Setting");
    heading.setFont(new Font("Sarif",Font.BOLD+Font.ITALIC,25));
    
    
    JPanel inputOptionsPanel = new JPanel(new GridLayout(1,1,5,5));
    
    JLabel oneOptionPage = new JLabel("Page size");
    pagesizetext = new JTextArea(1,5);
   
    inputOptionsPanel.add(oneOptionPage);
    inputOptionsPanel.add(pagesizetext);
    
    JButton saveButton = new JButton("save setting");
    saveButton.addActionListener(new ActionListener() {
     
     @Override
     public void actionPerformed(ActionEvent e) {
     
      
      try{
       int size = Integer.parseInt(pagesizetext.getText().toString());
      
       // Create File
       try{
       PrintWriter myFile=new PrintWriter("configuartion.txt");
       myFile.print("page size:"+pagesizetext.getText().toString());
       myFile.close();
       configuration_frame.setVisible(false);
       }
       catch(IOException eio ){
        JOptionPane.showMessageDialog(null,
             "file not found",
             "IOException",
             JOptionPane.ERROR_MESSAGE);
       }
      }catch(NumberFormatException nue){
       JOptionPane.showMessageDialog(null,
            "not number",
            "Input Error",
            JOptionPane.ERROR_MESSAGE);
      }
     }
    });
    
    configuration_frame.add(heading,BorderLayout.NORTH); 
    configuration_frame.add(inputOptionsPanel);
    configuration_frame.add(saveButton,BorderLayout.SOUTH);
   }
  });
 
  arrangeButton.insets = new Insets(0,0,10,20);
  
  radioButtonGroup = new ButtonGroup();
  
  radioButtonActionHandler eventHandler = new radioButtonActionHandler();
  
  menuPanel.setBorder(BorderFactory.createLineBorder(Color.GRAY));
  
  int y = 3;
  for(int i=0;i<managementButtonSize;i++)
  {
   arrangeButton.gridx = 0;
   arrangeButton.gridy = y;
   managementButton[i] = new JRadioButton(managementButtonName[i]);
   managementButton[i].setFont(new Font("Serif",Font.BOLD,25));
   menuPanel.add(managementButton[i],arrangeButton);
   y =y+2;
   
   radioButtonGroup.add(managementButton[i]);
   managementButton[i].addActionListener(eventHandler);
  }
    
  mainWindow.add(headingPanel,BorderLayout.NORTH);
  mainWindow.add(menuPanel,BorderLayout.CENTER);
 }//end of constructor (public MainMenu())
 
 public class radioButtonActionHandler implements ActionListener{
  public void actionPerformed(ActionEvent event){
     
   for(int i=0;i<managementButtonSize;i++)
   {
    if(event.getSource() == managementButton[i])
    {
     menuPanel.setVisible(false);
     headingPanel.setVisible(false);
     
     switch(i)
     {
      case 0:
      {
       ProcessGUI process= new ProcessGUI();
       process.ProcessGUIMenu(new SchedulingQueue());
       break;
      }//end of case 0:
      
      case 1:
      case 2:
      case 3:
      {
       JLabel meanHeading = new JLabel(managementButtonName[i]);
       meanHeading.setFont(new Font("Sarif",Font.BOLD+Font.ITALIC,25));
       headingPanel = new JPanel();
       headingPanel.add(meanHeading);
       mainWindow.add(headingPanel,BorderLayout.NORTH);
       
       JLabel proMessage= new JLabel("In Progress");
       proMessage.setFont(new Font("Sarif",Font.BOLD+Font.ITALIC,75));
       mainWindow.add(proMessage,BorderLayout.CENTER);
      }//end of cases
     }//end of switch
    }//end of if(event.getSource() == managementButton[i])
   }//end of for(int i=0;i<managementButtonSize;i++)
   
  }//end of public void actionPerformed(ActionEvent event)
 }//end of public class radioButtonActionHandler implements ActionListener
}//end of public class MainMenu extends ProgramManager


ProcessGUI.java

package riu.cms7425.GUI;


import java.awt.*;
import javax.swing.*;

import java.awt.event.*;
import java.util.LinkedList;
import java.util.Queue;

import riu.cms7425.ProcessManagement.Process;
import riu.cms7425.ProcessManagement.ProcessPage;
import riu.cms7425.ProcessManagement.SchedulingQueue;

public class ProcessGUI extends ControlPanel{

 JPanel processPanel = new JPanel();
 JPanel headingPanel = new JPanel();
 
 Box buttonBox = Box.createVerticalBox();     //for adjustment button
 
 JButton back;
 
 final int processButtonSize = 8; 
 JButton processbutton[] = new JButton[processButtonSize];
 String processButtonName[] = {"       Create process       ","       resume process     ","       suspend process   ",
        "       block process         ","     wake up process      ","       dispatch process   ",
        "       priority process      "," cummunicate process"};
 ButtenEventHandler buttonHandle = new ButtenEventHandler();
 
 //Queue<Process> processCreateQueue = new LinkedList<Process>();
 Process process ;

 SchedulingQueue scQue = new SchedulingQueue();
 /*public ProcessGUI(){
  
 }*/
 
 /*public ProcessGUI(){
  ProcessGIl();
 }
 
 public ProcessGUI(SchedulingQueue scQueArg)
 {
  scQue= scQueArg;
  ProcessGUIMenu();
  //mainWindow.setVisible(true);
 }//end of public ProcessGUI()
 */
 public void ProcessGUIMenu(SchedulingQueue scQueArg){
  scQue = scQueArg;
  JLabel meanHeading = new JLabel("Process Management menu");
  meanHeading.setFont(new Font("Sarif",Font.BOLD+Font.ITALIC,25));
 
  headingPanel.add(meanHeading);
  
  back = new JButton("<< back");
  headingPanel.add(back);
  
  back.addActionListener(buttonHandle);         //back to mean menu..
  buttonBox.setBorder(BorderFactory.createLineBorder(Color.GRAY));
  
  for(int i=0;i<processButtonSize;i++)
  {
   processbutton[i] = new JButton(processButtonName[i]);     //initialize the button and name it
   processbutton[i].setPreferredSize(new Dimension(165,25));
   buttonBox.add(Box.createVerticalStrut(25));       //gape between button
   buttonBox.add(processbutton[i]);         //add button in the panel 
   
   processbutton[i].addActionListener(buttonHandle);     //initialize action to each button 
  }//end of for(int i=0;i<processButtonSize;i++)
  
  processPanel.add(buttonBox);
  
  mainWindow.add(headingPanel,BorderLayout.NORTH);
  mainWindow.add(processPanel,BorderLayout.CENTER);
 }
 
 public class ButtenEventHandler implements ActionListener{ 
  
  public void actionPerformed(ActionEvent event){
   
   if(event.getSource() == back){
    processPanel.setVisible(false);
    headingPanel.setVisible(false);
    
    new MainMenu();   //display main Menu..
   }//end of if(event.getSource() == back)
   
   if(event.getSource() == processbutton[0])
   {
    process = new Process();
    process.createProcess();
    
    process.processInfo.setProcessState("Ready");
    scQue.processReadyQueue.add(process);
    
    //**only for implementation check...
    JOptionPane.showMessageDialog(null,
         "process id : " +  process.getProcessInfo().getProcessId() +"\n state:"
         +process.getProcessInfo().getProcessStatus(),
         "Process Detail",
         JOptionPane.INFORMATION_MESSAGE);
    
    ProcessPage page = new ProcessPage();
    page.pageCalculate(process);
   }
   
   if(event.getSource() == processbutton[1]){        
    process = new Process();
    process.resumeProcess(scQue);
    
   }
   
   if(event.getSource() == processbutton[2]){        
    process = new Process();
    process.suspendprocess(scQue);
   }
   
   if(event.getSource() == processbutton[3]){
    process = new Process();
    process.blockProcess(scQue); 
   }
   
   if(event.getSource() == processbutton[4]){        
    process = new Process();
    process.wakeUpProcess(scQue);
    
   }
   
   if(event.getSource() == processbutton[5]){
    
    processPanel.setVisible(false);
    headingPanel.setVisible(false);
        
    new SchedulingGUI(scQue);
    //process.DispatchProcess(scQue.getProcessReadyQueue(),0);
   }
   
   if(event.getSource() == processbutton[7]){
    process = new Process();
    process.communicateOtherProcess();
   }
   
  /* for(int i = 1;i<processButtonSize;i++)
   {
    if(event.getSource() == processbutton[i])
    {
     processPanel.setVisible(false);
     headingPanel.setVisible(false);
     
     JLabel btnName= new JLabel(processButtonName[i]);
     JLabel proMessage = new JLabel(", In Progress");
     //JPanel p = new JPanel();
     Box p = Box.createVerticalBox();
     p.add(btnName);
     p.add(proMessage);
     btnName.setFont(new Font("Sarif",Font.ITALIC,50));
     proMessage.setFont(new Font("Sarif",Font.ITALIC,45));
     mainWindow.add(p,BorderLayout.CENTER);
    }//end of if(event.getSource() == processbutton[i])
   }//end of for(int i = 0;i<processButtonSize;i++)*/
   
  }//end of public void actionPerformed(ActionEvent event)
 }//end of inner class public class ButtenEventHandler implements ActionListener{
}//end of public class ProcessGUI extends ControlPanel{


SchedulingGUI.java

package riu.cms7425.GUI;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.LinkedList;
import java.util.Queue;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;

import riu.cms7425.ProcessManagement.Process;
import riu.cms7425.ProcessManagement.SchedulingQueue;

public class SchedulingGUI extends ProcessGUI{
 JPanel schedulingHeadingPanel = new JPanel();
 JButton backProcessMenuBtn;
 String[] buttonschedulingName = {"F.C.F.S (Queue)","Round Robin "} ;
 JButton[] schedulingButton = new JButton[2];
 Box buttonBoxScheduling = Box.createVerticalBox();     //for adjustment button
 JPanel schedulingPanel = new JPanel();
 SchedulingButtonHandler schedulingEventHandler = new SchedulingButtonHandler();
 //Queue<Process> processQueue = new LinkedList<Process>();
 int numSch;
 SchedulingQueue schedulingQGUI;
 
 public  SchedulingGUI(SchedulingQueue queueArg){
  
  schedulingQGUI = queueArg;
  JLabel schedulingHeading = new JLabel("Scheduling Menu");
  schedulingHeading.setFont(new Font("Sarif",Font.BOLD+Font.ITALIC,25));
  
  backProcessMenuBtn = new JButton("<<Back");
  backProcessMenuBtn.addActionListener(schedulingEventHandler);
  schedulingHeadingPanel.add(schedulingHeading);
  schedulingHeadingPanel.add(backProcessMenuBtn);
  
  buttonBoxScheduling.setBorder(BorderFactory.createLineBorder(Color.GRAY));
  for(int i=0;i<2;i++)
  {
   schedulingButton[i] = new JButton(buttonschedulingName[i]);     //initialize the button and name it
   schedulingButton[i].setPreferredSize(new Dimension(165,25));
   buttonBoxScheduling.add(Box.createVerticalStrut(25));       //gape between button
   buttonBoxScheduling.add(schedulingButton[i]);         //add button in the panel 
   
   schedulingButton[i].addActionListener(schedulingEventHandler);     //initialize action to each button 
  }//end of for(int i=0;i<processButtonSize;i++)
  
  
  schedulingPanel.add(buttonBoxScheduling);
  
  mainWindow.add(schedulingHeadingPanel,BorderLayout.NORTH);
  mainWindow.add(schedulingPanel,BorderLayout.CENTER);
 }
 
 class SchedulingButtonHandler implements ActionListener{

  @Override
  public void actionPerformed(ActionEvent event) {
   
   if(event.getSource() == backProcessMenuBtn){
    schedulingPanel.setVisible(false);
    schedulingHeadingPanel.setVisible(false);
    
    ProcessGUI p = new ProcessGUI();
    p.ProcessGUIMenu(schedulingQGUI);
   }
   
   if(event.getSource() == schedulingButton[0]){
    process = new Process();
    process.DispatchProcess(schedulingQGUI, 0);
   }
   
   if(event.getSource() == schedulingButton[1]){
    process = new Process();
    process.DispatchProcess(schedulingQGUI, 1);
   }
  }
  
 }
 
}

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Asad Niazi is Software Engineer , Programmer, Web Developers and a young mentor of Tech Solutions Desk and Blogging Solutions . Asad Love to writes about Technology, Programming, Blogging and make money online.