Jak przerobić na RMI :: 4programmers.net

posiadam kod pozwalający obliczyć wyznacznik macierzy, lecz muszę mieć go w postaci klient-serwer przy pomocy RMI (na jednym komputerze ma być odpalony i serwer i klient), potrafiłby ktoś mi z tym pomóc?
Klient ma pobierać macierz następnie przesyłać ją do serwera, który oblicza wyznacznik i wynik przesyła do klienta który go wyświetla.

Oto kod, który posiadam:

/*
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 * To change this template file, choose Tools | Templates
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 */

package WyznacznikMacierzy;
import javax.swing.*;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;



public class WyznacznikMacierzy extends JFrame implements ActionListener{ 
    
     
	private static final long serialVersionUID = 1L;
	JTable table;
	JButton btnGen = new JButton("Utwórz");
	JButton btnLicz = new JButton("Oblicz");
	JTextField txt = new JTextField(5);
	float macierz[][];
	
	 
	 public static void main(String[] args)
    {
        new WyznacznikMacierzy();
    }
        
	public WyznacznikMacierzy()

	{
		this.setSize(350,350);
		this.setLayout(null);
		JLabel l = new JLabel("Wielkość macierzy"); 
		this.add(l);
		txt.setText("5");
		this.add(txt);
		this.add(btnGen);
		this.add(btnLicz);
		
		//podlaczenie listeneera do buttonow
		btnGen.addActionListener(this);
		btnLicz.addActionListener(this);
		
		l.setBounds(10, 20, 400, 24);
		btnGen.setBounds(100,50,95,18);
		btnLicz.setBounds(200,50,95,18);
		txt.setBounds(20,50,80,18);
                
                 setLocationRelativeTo(null);
                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                setVisible(true);
	}
	
	public void inicjalizacjaMacierzy()
	{
		int rozmiarMacuerzy; 
		//gdy ilosc kolumn nie jest liczba to zakladamy 5
		try {
			rozmiarMacuerzy = Integer.valueOf(txt.getText());
		} catch (Exception e) {
			rozmiarMacuerzy = 5;
		}
		macierz = new float[rozmiarMacuerzy][rozmiarMacuerzy];
				
		if (table!=null) this.remove(table);
		DefaultTableModel model = new DefaultTableModel(rozmiarMacuerzy,rozmiarMacuerzy);
		table = new JTable(model);		
		table.setShowGrid(true);
		table.setBorder(BorderFactory.createLineBorder(Color.black));
		
		table.setBounds(new Rectangle(20,100,rozmiarMacuerzy*30,rozmiarMacuerzy*30));
			
		table.setRowHeight(30);
		
		TableColumn kolumny;
		for (int a=0;a<table.getColumnCount();a++)
		{
			kolumny = table.getColumnModel().getColumn(a);
			kolumny.setWidth(30);
		}
		this.add(table);
		
		this.repaint();
		
	}
	
	//obliczenie wyznacznika macierzy
	public float wyznacznikMacierzy(float[][] macierz, int wartość) {
		float bufor[][];
		float wynik = 0;
		if (wartość == 1) 
		{
			return macierz[0][0];
		} 
		else 
		{
			bufor = new float[wartość - 1][wartość - 1];
			for (int a = 0; a < wartość; a++) 
			{
				for (int b = 0; b < wartość - 1; b++) 
				{
					for (int k = 0; k < wartość - 1; k++) 
					{
						if (k<a)
						{
							bufor[b][k] = macierz[b + 1][k];
						}
						else
						{
							bufor[b][k] = macierz[b + 1][k+1];
						}							
					}
				}
				if (a % 2 == 0) //minory (znak) i obliczenie kolejnej macierzy
				{
					wynik += macierz[0][a] * wyznacznikMacierzy(bufor, wartość - 1);
				} 
				else 
				{
					wynik -= macierz[0][a] * wyznacznikMacierzy(bufor, wartość - 1);
				}
			}
			return wynik;
		}
	}

	

	@Override
	public void actionPerformed(ActionEvent e) {
		if (e.getSource()==btnGen)
		{
			this.inicjalizacjaMacierzy();
		}
		if (e.getSource()==btnLicz)
		{
			for (int a=0;a<macierz.length;a++)
			{
				for (int b=0;b<macierz.length;b++)
				{
					//wartosci domyslne (gdy nie ma liczby to zero)
					float value =0;
					try {
						value = Float.valueOf(table.getValueAt(a, b).toString());
					} catch (Exception ex) {
						value = 0;
						table.setValueAt("0", a,b);
					}
					macierz[a][b] = value;
				}			
			}
			try {
				JOptionPane.showMessageDialog(this,"Wyznacznik macierzy jest równy: "+wyznacznikMacierzy(macierz,macierz.length),"Info",1);
                               
			} catch (Exception e2) 
			{
				JOptionPane.showMessageDialog(this,"Nie można obliczyć wyznacznika.","Błąd",1);
			}
		}
	}
}

dodaję jeszcze pliki, które działają jako kalkulator przez RMI, więc potrzebuję połączyć te 2 projekty w jeden, tylko nie bardzo wiem jak:

serwer:

package server;

import rmi.Calculator;
import gui.GUI;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

public class Server implements Calculator {
    
    private GUI gui;
    
    public Server(GUI g) {
        gui = g;
    }
    
    public void bindStub() {
        try {
            LocateRegistry.createRegistry(1099);
            Calculator stub = (Calculator) UnicastRemoteObject.exportObject((Remote) this, 1099);
            Registry reg = LocateRegistry.getRegistry();
            reg.bind("Calculator", stub);
            gui.getTextArea().setText(">>>>> Serwer gotowy do pracy.");
        } catch(Exception e) {
            gui.getTextArea().setText(gui.getTextArea().getText() + "\n>>>>> Wystąpił błąd: " + e.toString());
        }
    }
    
    @Override
    public float add(float a, float b) throws RemoteException {
        gui.getTextArea().setText(gui.getTextArea().getText() + 
                "\n>>>>> Dodawanie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        //System.out.println("Dodawanie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        return a+b;
    }

    @Override
    public float sub(float a, float b) throws RemoteException {
        gui.getTextArea().setText(gui.getTextArea().getText() + 
                "\n>>>>> Odejmowanie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        //System.out.println("Odejmowanie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        return a-b;
    }

    @Override
    public float mul(float a, float b) throws RemoteException {
        gui.getTextArea().setText(gui.getTextArea().getText() + 
                "\n>>>>> Mnożenie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        //System.out.println("Mnożenie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        return a*b;
    }

    @Override
    public float div(float a, float b) throws RemoteException {
        gui.getTextArea().setText(gui.getTextArea().getText() + 
                "\n>>>>> Dzielenie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        //System.out.println("Dzielenie zostało zdalnie wywołane dla argumentów: a = " + a + " b = " + b);
        return a/b;
    }
    
     public int[] ciag(int parseInt) throws RemoteException {
         int[] tab=new int[parseInt];
         
         tab[0]=3;
         for(int i=1;i<parseInt;i++){
             tab[i]=2*(tab[i-1]);
         }
        return tab;
    }
    
}

package gui;

import java.rmi.server.UnicastRemoteObject;
import javax.swing.JTextArea;
import server.*;

public class GUI extends javax.swing.JFrame {

    private Server server;    
    
    public GUI() {
        initComponents();
        server = new Server(this);
        server.bindStub();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        ScrollPane = new javax.swing.JScrollPane();
        TextArea = new javax.swing.JTextArea();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Sever");

        ScrollPane.setEnabled(false);

        TextArea.setColumns(20);
        TextArea.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
        TextArea.setRows(5);
        TextArea.setText(">>>>> Serwer gotowy do pracy.");
        TextArea.setDisabledTextColor(new java.awt.Color(0, 0, 0));
        TextArea.setEnabled(false);
        ScrollPane.setViewportView(TextArea);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(ScrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 450, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(ScrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    public JTextArea getTextArea() {
        return TextArea;
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new GUI().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JScrollPane ScrollPane;
    private javax.swing.JTextArea TextArea;
    // End of variables declaration//GEN-END:variables

}

RMI:

package rmi;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface Calculator extends Remote {
    public int[] ciag(int parseInt) throws RemoteException;
    public float add(float a, float b) throws RemoteException;
    public float sub(float a, float b) throws RemoteException;
    public float mul(float a, float b) throws RemoteException;
    public float div(float a, float b) throws RemoteException;
}

Klient:

package client;

import rmi.Calculator;
import gui.GUI;
import java.awt.Color;
import java.io.InputStreamReader;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Client {

    private GUI gui;
    private Calculator stub;
    
    public Client(GUI g) {
        gui = g;
    }
    
    public Calculator getStub() {
        return stub;
    }
    
    public void connectServer() {
        try {
            Registry reg = LocateRegistry.getRegistry();
            Calculator stub = (Calculator) reg.lookup("Calculator");
            this.stub = stub;
        } catch(Exception e) {
            gui.getResultText().setDisabledTextColor(Color.red);
            gui.getResultText().setText("Brak połączenia z serwerem.");
        }
    }
    
}

package gui;

import client.Client;
import java.awt.Color;
import java.rmi.RemoteException;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JTextField;

public class GUI extends javax.swing.JFrame {

    private Client client;
    
    public GUI() {
        initComponents();
        client = new Client(this);
        client.connectServer();
    }
    
    private boolean checkVariables() {
        if(!aTextField.getText().isEmpty()) 
            return true;
        else {
            resultTextField.setDisabledTextColor(Color.red);
            resultTextField.setText("Podaj brakujące zmienne.");
            return false;
        }
            
    }
    
    private void evaluate(String s) {
        float result = 0;
        try {
            switch(s) {
                case "add":
                    result = client.getStub().add(Float.parseFloat(aTextField.getText()), Float.parseFloat(bTextField.getText()));
                    break;
                case "sub":
                    result = client.getStub().sub(Float.parseFloat(aTextField.getText()), Float.parseFloat(bTextField.getText()));
                    break;
                case "mul":
                    result = client.getStub().mul(Float.parseFloat(aTextField.getText()), Float.parseFloat(bTextField.getText()));
                    break;
                case "div":
                    result = client.getStub().div(Float.parseFloat(aTextField.getText()), Float.parseFloat(bTextField.getText()));
                    break;
                case "ciag":
                    int[] wynik=new int[Integer.parseInt(aTextField.getText())];
                    wynik=client.getStub().ciag(Integer.parseInt(aTextField.getText()));
                    jTextArea1.setText(Arrays.toString(wynik));
                    break;
                default:
                    break;
            }
            resultTextField.setDisabledTextColor(Color.black);
            resultTextField.setText(Float.toString(result));
        } catch (RemoteException ex) {
                resultTextField.setDisabledTextColor(Color.red);
                resultTextField.setText("Błąd połączenia.");
        }
    }
    
    private void displayVarError() {
        resultTextField.setDisabledTextColor(Color.red);
        resultTextField.setText("Podaj brakujące zmienne.");
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        OperationsPanel = new javax.swing.JPanel();
        AddButton = new javax.swing.JButton();
        SubPanel = new javax.swing.JButton();
        MultPanel = new javax.swing.JButton();
        DivPanel = new javax.swing.JButton();
        DataPanel = new javax.swing.JPanel();
        aLabel = new javax.swing.JLabel();
        aTextField = new javax.swing.JTextField();
        bTextField = new javax.swing.JTextField();
        bLabel = new javax.swing.JLabel();
        resultTextField = new javax.swing.JTextField();
        DivPanel1 = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Calculator");
        setResizable(false);

        OperationsPanel.setBorder(javax.swing.BorderFactory.createTitledBorder("Operacje"));

        AddButton.setText("Dodawanie");
        AddButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                AddButtonActionPerformed(evt);
            }
        });

        SubPanel.setText("Odejmowanie");
        SubPanel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                SubPanelActionPerformed(evt);
            }
        });

        MultPanel.setText("Mnożenie");
        MultPanel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                MultPanelActionPerformed(evt);
            }
        });

        DivPanel.setText("Dzielenie");
        DivPanel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                DivPanelActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout OperationsPanelLayout = new javax.swing.GroupLayout(OperationsPanel);
        OperationsPanel.setLayout(OperationsPanelLayout);
        OperationsPanelLayout.setHorizontalGroup(
            OperationsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(OperationsPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addGroup(OperationsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(AddButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(SubPanel, javax.swing.GroupLayout.DEFAULT_SIZE, 152, Short.MAX_VALUE)
                    .addComponent(MultPanel, javax.swing.GroupLayout.DEFAULT_SIZE, 152, Short.MAX_VALUE)
                    .addComponent(DivPanel, javax.swing.GroupLayout.DEFAULT_SIZE, 152, Short.MAX_VALUE))
                .addContainerGap())
        );
        OperationsPanelLayout.setVerticalGroup(
            OperationsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(OperationsPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(AddButton)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(SubPanel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(MultPanel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 18, Short.MAX_VALUE)
                .addComponent(DivPanel))
        );

        DataPanel.setBorder(javax.swing.BorderFactory.createTitledBorder("Dane"));

        aLabel.setText("Podaj a:");

        bLabel.setText("Podaj b:");

        resultTextField.setDisabledTextColor(new java.awt.Color(0, 0, 0));
        resultTextField.setEnabled(false);

        javax.swing.GroupLayout DataPanelLayout = new javax.swing.GroupLayout(DataPanel);
        DataPanel.setLayout(DataPanelLayout);
        DataPanelLayout.setHorizontalGroup(
            DataPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(DataPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addGroup(DataPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(DataPanelLayout.createSequentialGroup()
                        .addGroup(DataPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(aLabel)
                            .addComponent(aTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addGroup(DataPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(bLabel)
                            .addComponent(bTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(0, 0, Short.MAX_VALUE))
                    .addComponent(resultTextField, javax.swing.GroupLayout.Alignment.TRAILING))
                .addContainerGap())
        );
        DataPanelLayout.setVerticalGroup(
            DataPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(DataPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addGroup(DataPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(bLabel)
                    .addComponent(aLabel))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(DataPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(bTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(aTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addComponent(resultTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        DivPanel1.setText("Ciag");
        DivPanel1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                DivPanel1ActionPerformed(evt);
            }
        });

        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        jScrollPane1.setViewportView(jTextArea1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(OperationsPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap(311, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(DataPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
            .addGroup(layout.createSequentialGroup()
                .addComponent(DivPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 200, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(DataPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(OperationsPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(DivPanel1)
                .addContainerGap(96, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void AddButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_AddButtonActionPerformed
        if(checkVariables()) 
            evaluate("add");
        else 
            displayVarError();
        
    }//GEN-LAST:event_AddButtonActionPerformed

    private void SubPanelActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_SubPanelActionPerformed
        if(checkVariables()) 
            evaluate("sub");
        else 
            displayVarError();
        
    }//GEN-LAST:event_SubPanelActionPerformed

    private void MultPanelActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_MultPanelActionPerformed
        if(checkVariables()) 
            evaluate("mul");
        else 
            displayVarError();
    }//GEN-LAST:event_MultPanelActionPerformed

    private void DivPanelActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_DivPanelActionPerformed
        if(checkVariables()) 
            evaluate("div");
        else
            displayVarError();
    }//GEN-LAST:event_DivPanelActionPerformed

    private void DivPanel1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_DivPanel1ActionPerformed
        if(checkVariables())
            evaluate("ciag");
        else
            displayVarError();
    }//GEN-LAST:event_DivPanel1ActionPerformed

    public JTextField getResultText() {
        return resultTextField;
    }
    
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new GUI().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton AddButton;
    private javax.swing.JPanel DataPanel;
    private javax.swing.JButton DivPanel;
    private javax.swing.JButton DivPanel1;
    private javax.swing.JButton MultPanel;
    private javax.swing.JPanel OperationsPanel;
    private javax.swing.JButton SubPanel;
    private javax.swing.JLabel aLabel;
    private javax.swing.JTextField aTextField;
    private javax.swing.JLabel bLabel;
    private javax.swing.JTextField bTextField;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JTextField resultTextField;
    // End of variables declaration//GEN-END:variables
}

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