Scientific-Calculator using Eclipse in java program

A scientific calculator built using java swing and eclipse swing window builder.

Calculator.java 

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import java.awt.Toolkit;
import java.awt.Window.Type;
import java.awt.ComponentOrientation;
import java.awt.Cursor;
import javax.swing.JTable;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Component;
import javax.swing.JComboBox;
import javax.swing.JTextPane;
import javax.swing.DefaultComboBoxModel;

public class Calculator extends JFrame {

     /**
     *
     * @author Ghassen ben taher
     * 
     */
    
    private static final long serialVersionUID = 1L;
    private JFrame frame;
    private JPanel contentPane;
    

    private JTextField txtDisplay;
    private JTextField textField;
    
    
    double firstNum;
    double secondNum;
    double result;
    
    String operations;
    String answer;
    
    
    double Nigerian_Naira = 535.96;
    double US_Dollar = 1.52;
    double Kenyan_Shilling = 156.21;
    double Brazilian_Real = 5.86;
    double Canadian_Dollar = 2.03;
    double Indian_Rupee = 100.68;
    double Philippine_Perso = 71.74;
    double Indonesian_Rupiah = 20746.75;
    private JTextField jlblConverts;
    private JTextField display;
    
    
        

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Calculator frame = new Calculator();
                    frame.setUndecorated(true);
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public Calculator() {
        setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
        setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
        setIconImage(Toolkit.getDefaultToolkit().getImage("src/images/calculator-icon.png"));
        setFont(new Font("Ubuntu", Font.PLAIN, 12));
        setTitle("Calculator");
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        
        
        setBackground(Color.WHITE);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 361, 380);
        
        JMenuBar menuBar = new JMenuBar();
        menuBar.setFont(new Font("Ubuntu Light", Font.ITALIC, 11));
        menuBar.setBackground(new Color(255, 255, 255));
        
        setJMenuBar(menuBar);
        
        JMenu mnFile = new JMenu("File");
        mnFile.setFont(new Font("Ubuntu Light", Font.PLAIN, 12));
        mnFile.setForeground(new Color(0, 0, 0));
        mnFile.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        menuBar.add(mnFile);
        
        JMenuItem mntmStandard = new JMenuItem("Standard");
        mntmStandard.setSelected(true);
        mntmStandard.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                
                setTitle("Standard Calculator");
                setBounds(100, 100, 361, 380);
                txtDisplay.setBounds(5, 30, 350, 70);
            }
        });
        mntmStandard.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mntmStandard.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        mnFile.add(mntmStandard);
        
        JMenuItem mntmScientific = new JMenuItem("Scientific");
        mntmScientific.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                setTitle("Scientific Calculator");
                setBounds(100, 100, 680, 380);
                txtDisplay.setBounds(5, 30, 350, 70);
            }
        });
        mntmScientific.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mntmScientific.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        mnFile.add(mntmScientific);
        
        JMenuItem mntmUnitConverter = new JMenuItem("Unit Converter");
        mntmUnitConverter.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                setTitle("Unit Calculator");
                setBounds(100, 100, 910, 380);
                txtDisplay.setBounds(5, 30, 350, 70);
            }
        });
        mntmUnitConverter.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mntmUnitConverter.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        mnFile.add(mntmUnitConverter);
        
        JMenuItem mntmExit = new JMenuItem("Exit");
        mntmExit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        mntmExit.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mntmExit.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        mnFile.add(mntmExit);
        
        JLabel lblByGhassenBen = new JLabel("By Ghassen Ben Taher");
        lblByGhassenBen.setFont(new Font("Ubuntu Light", Font.PLAIN, 10));
        lblByGhassenBen.setForeground(new Color(0, 0, 0));
        menuBar.add(lblByGhassenBen);
        
    /*  JMenu mnEdit = new JMenu("Edit");
        mnEdit.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mnEdit.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        menuBar.add(mnEdit);
        
        JMenu mnView = new JMenu("View");
        mnView.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mnView.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        menuBar.add(mnView);
        
        JMenu mnHelp = new JMenu("Help");
        mnHelp.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mnHelp.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        menuBar.add(mnHelp);*/
        
        /*JMenuItem mntmAbout = new JMenuItem("About");
        mntmAbout.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        mntmAbout.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        mnHelp.add(mntmAbout);*/
        
        
        contentPane = new JPanel();
        contentPane.setAlignmentX(Component.RIGHT_ALIGNMENT);
        contentPane.setBackground(new Color(236,236,236));
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        
        txtDisplay = new JTextField();
        txtDisplay.setHorizontalAlignment(SwingConstants.RIGHT);
        txtDisplay.setBounds(5, 30, 350, 70);
        contentPane.add(txtDisplay);
        txtDisplay.setColumns(10);
        
        JButton btn_0 = new JButton("0");
        btn_0.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_0.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_0.setBounds(10, 306, 136, 23);
        btn_0.setFont(new Font("Arial", Font.BOLD, 10));
        btn_0.setBackground(new Color(108, 122, 137));
        btn_0.setForeground(Color.WHITE);
        contentPane.add(btn_0);
        
        JButton btn_back = new JButton("\u25C4");
        btn_back.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                
                String backspace = null;
                
                if (txtDisplay.getText().length() > 0) {
                    StringBuilder strB = new StringBuilder(txtDisplay.getText());
                    strB.deleteCharAt(txtDisplay.getText().length() -1);
                    backspace = strB.toString();
                    txtDisplay.setText(backspace);
                }
            }
        });
        btn_back.setFont(new Font("Arial", Font.BOLD, 10));
        btn_back.setBackground(new Color(108, 122, 137));
        btn_back.setForeground(Color.WHITE);
        btn_back.setBounds(10, 146, 63, 23);
        contentPane.add(btn_back);
        
        JButton btn_7 = new JButton("7");
        btn_7.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                
                String iNum = txtDisplay.getText() + btn_7.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_7.setBounds(10, 186, 63, 23);
        btn_7.setFont(new Font("Arial", Font.BOLD, 10));
        btn_7.setBackground(new Color(108, 122, 137));
        btn_7.setForeground(Color.WHITE);
        contentPane.add(btn_7);
        
        JButton btn_4 = new JButton("4");
        btn_4.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String iNum = txtDisplay.getText() + btn_4.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_4.setBounds(10, 226, 63, 23);
        btn_4.setFont(new Font("Arial", Font.BOLD, 10));
        btn_4.setBackground(new Color(108, 122, 137));
        btn_4.setForeground(Color.WHITE);
        
        contentPane.add(btn_4);
        
        JButton btnCe = new JButton("\u0152");
        btnCe.setBounds(80, 146, 63, 23);
        btnCe.setFont(new Font("Arial", Font.BOLD, 10));
        btnCe.setBackground(new Color(108, 122, 137));
        btnCe.setForeground(Color.WHITE);
        contentPane.add(btnCe);
        
        JButton btn_8 = new JButton("8");
        btn_8.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_8.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_8.setBounds(80, 186, 63, 23);
        btn_8.setFont(new Font("Arial", Font.BOLD, 10));
        btn_8.setBackground(new Color(108, 122, 137));
        btn_8.setForeground(Color.WHITE);
        contentPane.add(btn_8);
        
        JButton btn_5 = new JButton("5");
        btn_5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_5.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_5.setBounds(80, 226, 63, 23);
        btn_5.setFont(new Font("Arial", Font.BOLD, 10));
        btn_5.setBackground(new Color(108, 122, 137));
        btn_5.setForeground(Color.WHITE);
        contentPane.add(btn_5);
        
        JButton btn_clear = new JButton("C");
        btn_clear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                txtDisplay.setText(null);
            }
        });
        btn_clear.setBounds(150, 146, 63, 23);
        btn_clear.setFont(new Font("Arial", Font.BOLD, 10));
        btn_clear.setBackground(new Color(108, 122, 137));
        btn_clear.setForeground(Color.WHITE);
        contentPane.add(btn_clear);
        
        JButton btn_9 = new JButton("9");
        btn_9.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_9.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_9.setBounds(150, 186, 63, 23);
        btn_9.setFont(new Font("Arial", Font.BOLD, 10));
        btn_9.setBackground(new Color(108, 122, 137));
        btn_9.setForeground(Color.WHITE);
        contentPane.add(btn_9);
        
        JButton btn_6 = new JButton("6");
        btn_6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_6.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_6.setBounds(150, 226, 63, 23);
        btn_6.setFont(new Font("Arial", Font.BOLD, 10));
        btn_6.setBackground(new Color(108, 122, 137));
        btn_6.setForeground(Color.WHITE);
        contentPane.add(btn_6);
        
        JButton button_plusless = new JButton("\u00B1");
        button_plusless.setForeground(new Color(255, 255, 255));
        button_plusless.setBackground(new Color(108, 122, 137));
        button_plusless.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = ops * (-1);
                txtDisplay.setText(String.valueOf(ops));
                
            }
        });
        button_plusless.setBounds(220, 146, 63, 23);
        btn_0.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(button_plusless);
        
        JButton btn_division = new JButton("/");
        btn_division.setForeground(new Color(255, 255, 255));
        btn_division.setBackground(new Color(108, 122, 137));
        btn_division.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                firstNum = Double.parseDouble(txtDisplay.getText());
                txtDisplay.setText("");
                display.setText(firstNum + " /");
                operations = "/";
            }
        });
        btn_division.setBounds(220, 186, 63, 23);
        btn_division.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_division);
        
        JButton btn_multiplication = new JButton("*");
        btn_multiplication.setForeground(new Color(255, 255, 255));
        btn_multiplication.setBackground(new Color(108, 122, 137));
        btn_multiplication.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                firstNum = Double.parseDouble(txtDisplay.getText());
                txtDisplay.setText("");
                display.setText(firstNum + " *");
                operations = "*";
            }
        });
        btn_multiplication.setBounds(220, 226, 63, 23);
        btn_multiplication.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_multiplication);
        
        JButton btnV = new JButton("\u221A");
        btnV.setForeground(new Color(255, 255, 255));
        btnV.setBackground(new Color(108, 122, 137));
        btnV.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.sqrt(ops) ;
                txtDisplay.setText(String.valueOf(ops));
                
            }
        });
        btnV.setBounds(290, 146, 63, 23);
        btnV.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btnV);
        
        JButton button_13 = new JButton("%");
        button_13.setForeground(new Color(255, 255, 255));
        button_13.setBackground(new Color(108, 122, 137));
        button_13.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                firstNum = Double.parseDouble(txtDisplay.getText());
                txtDisplay.setText("");
                operations = "%";
            }
        });
        button_13.setBounds(290, 186, 63, 23);
        button_13.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(button_13);
        
        JButton btnx = new JButton("1/\u0353");
        btnx.setForeground(new Color(255, 255, 255));
        btnx.setBackground(new Color(108, 122, 137));
        btnx.setBounds(290, 226, 63, 23);
        btnx.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btnx);
        
        JButton btn_subtraction = new JButton("-");
        btn_subtraction.setForeground(new Color(255, 255, 255));
        btn_subtraction.setBackground(new Color(108, 122, 137));
        btn_subtraction.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                firstNum = Double.parseDouble(txtDisplay.getText());
                txtDisplay.setText("");
                display.setText(firstNum + " -");
                operations = "-";
            }
        });
        btn_subtraction.setBounds(220, 266, 63, 23);
        btn_0.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_subtraction);
        
        JButton btn_3 = new JButton("3");
        btn_3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_3.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_3.setBounds(150, 266, 63, 23);
        btn_3.setFont(new Font("Arial", Font.BOLD, 10));
        btn_3.setBackground(new Color(108, 122, 137));
        btn_3.setForeground(Color.WHITE);
        contentPane.add(btn_3);
        
        JButton btn_2 = new JButton("2");
        btn_2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_2.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_2.setBounds(80, 266, 63, 23);
        btn_2.setFont(new Font("Arial", Font.BOLD, 10));
        btn_2.setBackground(new Color(108, 122, 137));
        btn_2.setForeground(Color.WHITE);
        contentPane.add(btn_2);
        
        JButton btn_1 = new JButton("1");
        btn_1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_1.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_1.setBounds(10, 266, 63, 23);
        btn_1.setFont(new Font("Arial", Font.BOLD, 10));
        btn_1.setBackground(new Color(108, 122, 137));
        btn_1.setForeground(Color.WHITE);
        contentPane.add(btn_1);
        
        JButton btn_vrg = new JButton(".");
        btn_vrg.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String iNum = txtDisplay.getText() + btn_vrg.getText();
                txtDisplay.setText(iNum);
            }
        });
        btn_vrg.setBounds(150, 306, 63, 23);
        btn_vrg.setFont(new Font("Arial", Font.BOLD, 10));
        btn_vrg.setBackground(new Color(108, 122, 137));
        btn_vrg.setForeground(Color.WHITE);
        contentPane.add(btn_vrg);
        
        JButton btn_addition = new JButton("+");
        btn_addition.setBackground(new Color(108, 122, 137));
        btn_addition.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                firstNum = Double.parseDouble(txtDisplay.getText());
                txtDisplay.setText("");
                display.setText(firstNum + " +");
                operations = "+";
            }
        });
        btn_addition.setBounds(220, 306, 63, 23);
        btn_addition.setFont(new Font("Arial", Font.BOLD, 10));
        btn_addition.setForeground(Color.WHITE);
        contentPane.add(btn_addition);
        
        JButton btn_sum = new JButton("=");
        btn_sum.setForeground(new Color(255, 255, 255));
        btn_sum.setBackground(new Color(34, 49, 63));
        btn_sum.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                String answer;
                secondNum = Double.parseDouble(txtDisplay.getText());
                if (operations == "+")
                {
                    result = firstNum + secondNum;
                    answer = String.format("%.2f", result);
                    txtDisplay.setText(answer);
                }
                
                else if (operations == "-")
                {
                    
                        result = firstNum - secondNum;
                        answer = String.format("%.2f", result);
                        txtDisplay.setText(answer);
                }
                
                else if (operations == "*")
                    {
                        
                            result = firstNum * secondNum;
                            answer = String.format("%.2f", result);
                            txtDisplay.setText(answer);
                        }
                else if (operations == "/")
                {
                    
                        result = firstNum / secondNum;
                        answer = String.format("%.2f", result);
                        txtDisplay.setText(answer);
                    
                }
                display.setText(null);
                    }
            
                
            
        });
        btn_sum.setBounds(290, 266, 63, 63);
        btn_0.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_sum);
        
        JButton btn_Log = new JButton("log");
        btn_Log.setFont(new Font("Arial", Font.BOLD, 10));
        btn_Log.setBackground(Color.PINK);
        btn_Log.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.log(ops) ;
                txtDisplay.setText(String.valueOf(ops));
                
            }
        });
        btn_Log.setBounds(396, 146, 56, 23);
        btn_0.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Log);
        
        JLabel lblCurrencyConverter = new JLabel("Currency Converter");
        lblCurrencyConverter.setHorizontalAlignment(SwingConstants.CENTER);
        lblCurrencyConverter.setFont(new Font("Ubuntu Medium", Font.PLAIN, 19));
        lblCurrencyConverter.setBounds(692, 72, 188, 46);
        contentPane.add(lblCurrencyConverter);
        
        JComboBox comboBox = new JComboBox();
        comboBox.setModel(new DefaultComboBoxModel(new String[] {"Choose One ...", "USA", "Nigeria", "Kenyan", "Canada", "Brazil", "Indeonesia", "Philippine", "India"}));
        comboBox.setBounds(692, 147, 203, 20);
        comboBox.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(comboBox);
        
        textField = new JTextField();
        textField.setBounds(692, 186, 203, 51);
        textField.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        contentPane.add(textField);
        textField.setColumns(10);
        
        JButton btn_Convert = new JButton("Convert");
        btn_Convert.setForeground(Color.WHITE);
        btn_Convert.setBackground(Color.GRAY);
        btn_Convert.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double Britsh_Pound = Double.parseDouble(textField.getText());
                if(comboBox.getSelectedItem().equals("Nigeria"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * Nigerian_Naira);
                    jlblConverts.setText(cConvert1);
                    }
                if(comboBox.getSelectedItem().equals("USA"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * US_Dollar);
                    jlblConverts.setText(cConvert1);
                    }
                if(comboBox.getSelectedItem().equals("Kenyan"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * Kenyan_Shilling);
                    jlblConverts.setText(cConvert1);
                    }
                if(comboBox.getSelectedItem().equals("Canada"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * Canadian_Dollar);
                    jlblConverts.setText(cConvert1);
                    }
                if(comboBox.getSelectedItem().equals("Brazil"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * Brazilian_Real);
                    jlblConverts.setText(cConvert1);
                    }
                if(comboBox.getSelectedItem().equals("India"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * Indian_Rupee);
                    jlblConverts.setText(cConvert1);
                    }
                if(comboBox.getSelectedItem().equals("Philippine"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * Philippine_Perso);
                    jlblConverts.setText(cConvert1);
                    }
                if(comboBox.getSelectedItem().equals("Indonesia"))
                {
                    String cConvert1 = String.format("N %.2f", Britsh_Pound * Indonesian_Rupiah);
                    jlblConverts.setText(cConvert1);
                    }
                
                
                
                
            }
        });
        btn_Convert.setBounds(707, 286, 89, 23);
        btn_Convert.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Convert);
        
        JButton btn_Clear = new JButton("Clear");
        btn_Clear.setForeground(Color.WHITE);
        btn_Clear.setBackground(Color.GRAY);
        btn_Clear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                textField.setText(null);
                jlblConverts.setText(null);
                comboBox.setSelectedItem("Choose One ...");
                
                
            }
        });
        btn_Clear.setBounds(806, 286, 89, 23);
        btn_Clear.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Clear);
        
        JButton btn_Sin = new JButton("Sin");
        btn_Sin.setBackground(Color.PINK);
        btn_Sin.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.sin(ops) ;
                txtDisplay.setText(String.valueOf(ops));
                
            }
        });
        btn_Sin.setBounds(463, 146, 56, 23);
        btn_Sin.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Sin);
        
        JButton btn_Sinh = new JButton("Sinh");
        btn_Sinh.setBackground(Color.PINK);
        btn_Sinh.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.sinh(ops) ;
                txtDisplay.setText(String.valueOf(ops));
                
            }
        });
        btn_Sinh.setBounds(530, 146, 56, 23);
        btn_Sinh.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Sinh);
        
        JButton btn_Mod = new JButton("Mod");
        btn_Mod.setBackground(Color.PINK);
        btn_Mod.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                firstNum = Double.parseDouble(txtDisplay.getText());
                txtDisplay.setText("");
                operations = "Mod";
            }
        });
        btn_Mod.setBounds(595, 146, 56, 23);
        btn_Mod.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Mod);
        
        JButton btn_pii = new JButton("\u03C0");
        btn_pii.setBackground(Color.PINK);
        btn_pii.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops ;
                ops = (3.14159265359)  ;
                txtDisplay.setText(String.valueOf(ops));
                
                
            }
        });
        btn_pii.setBounds(396, 186, 56, 23);
        btn_pii.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_pii);
        
        JButton btn_Cos = new JButton("Cos");
        btn_Cos.setBackground(Color.PINK);
        btn_Cos.setBounds(463, 186, 56, 23);
        btn_Cos.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Cos);
        
        JButton btn_Cosh = new JButton("Cosh");
        btn_Cosh.setBackground(Color.PINK);
        btn_Cosh.setBounds(529, 186, 56, 23);
        btn_Cosh.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Cosh);
        
        JButton btn_Inx = new JButton("Inx");
        btn_Inx.setBackground(Color.PINK);
        btn_Inx.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.log10(ops);
                txtDisplay.setText(String.valueOf(ops));
            }
        });
        btn_Inx.setBounds(595, 186, 56, 23);
        btn_Inx.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Inx);
        
        JButton btn_XY = new JButton("x \u033D y");
        btn_XY.setBackground(Color.PINK);
        btn_XY.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.pow(ops, ops);
                txtDisplay.setText(String.valueOf(ops));
            }
        });
        btn_XY.setBounds(396, 226, 56, 23);
        btn_XY.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_XY);
        
        JButton btn_Tan = new JButton("Tan");
        btn_Tan.setBackground(Color.PINK);
        btn_Tan.setFont(new Font("Arial", Font.BOLD, 10));
        btn_Tan.setBounds(463, 226, 56, 23);
        contentPane.add(btn_Tan);
        
        JButton btn_Tanh = new JButton("Tanh");
        btn_Tanh.setBackground(Color.PINK);
        btn_Tanh.setBounds(529, 226, 56, 23);
        btn_Tanh.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Tanh);
        
        JButton btn_Exp = new JButton("Exp");
        btn_Exp.setBackground(Color.PINK);
        btn_Exp.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                firstNum = Double.parseDouble(txtDisplay.getText());
                txtDisplay.setText("");
                operations = "Exp";
            }
        });
        btn_Exp.setBounds(595, 226, 56, 23);
        btn_Exp.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Exp);
        
        JButton btn_X = new JButton("x \u033D 2");
        btn_X.setBackground(Color.PINK);
        btn_X.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = (ops * ops);
                txtDisplay.setText(String.valueOf(ops));
            }
        });
        btn_X.setBounds(396, 266, 56, 23);
        btn_X.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_X);
        
        JButton btn_Cbr = new JButton("Cbr");
        btn_Cbr.setBackground(Color.PINK);
        btn_Cbr.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.cbrt(ops);
                txtDisplay.setText(String.valueOf(ops));
            }
        });
        btn_Cbr.setBounds(463, 266, 56, 23);
        btn_Cbr.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Cbr);
        
        JButton btn_Rund = new JButton("Rnd");
        btn_Rund.setBackground(Color.PINK);
        btn_Rund.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops = Double.parseDouble(String.valueOf(txtDisplay.getText()));
                ops = Math.round(ops);
                txtDisplay.setText(String.valueOf(ops));
                
            }
        });
        btn_Rund.setBounds(529, 266, 56, 23);
        btn_Rund.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Rund);
        
        JButton btn_X_1 = new JButton("2 \u033D \u03C0");
        btn_X_1.setBackground(Color.PINK);
        btn_X_1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                double ops ;
                ops = (3.14159265359) * 2 ;
                txtDisplay.setText(String.valueOf(ops));
            }
        });
        btn_X_1.setBounds(595, 266, 56, 23);
        btn_X_1.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_X_1);
        
        JButton btnX_2 = new JButton("x \u033D 3");
        btnX_2.setBackground(Color.PINK);
        btnX_2.setBounds(396, 306, 56, 23);
        btnX_2.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btnX_2);
        
        JButton btn_Bin = new JButton("Bin");
        btn_Bin.setBackground(Color.PINK);
        btn_Bin.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                int a = Integer.parseInt(txtDisplay.getText()); // Binary
                txtDisplay.setText(Integer.toString(a,2));
            }
        });
        btn_Bin.setBounds(463, 306, 56, 23);
        btn_Bin.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Bin);
        
        JButton btn_Hex = new JButton("Hex");
        btn_Hex.setBackground(Color.PINK);
        btn_Hex.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                int a = Integer.parseInt(txtDisplay.getText()); // Binary
                txtDisplay.setText(Integer.toString(a,16));
            }
        });
        btn_Hex.setBounds(529, 306, 56, 23);
        btn_Hex.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Hex);
        
        JButton btn_Oct = new JButton("Oct");
        btn_Oct.setBackground(Color.PINK);
        btn_Oct.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                int a = Integer.parseInt(txtDisplay.getText()); // Binary
                textField.setText(Integer.toString(a,8));
            }
        });
        btn_Oct.setBounds(595, 306, 56, 23);
        btn_Oct.setFont(new Font("Arial", Font.BOLD, 10));
        contentPane.add(btn_Oct);
        
        jlblConverts = new JTextField();
        jlblConverts.setEditable(false);
        jlblConverts.setBounds(719, 248, 161, 27);
        jlblConverts.setBackground(new Color(236,236,236));
        jlblConverts.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        contentPane.add(jlblConverts);
        jlblConverts.setColumns(10);
        
        display = new JTextField();
        display.setFont(new Font("Ubuntu Light", Font.PLAIN, 11));
        display.setEditable(false);
        display.setBounds(249, 11, 86, 20);
        contentPane.add(display);
        display.setColumns(10);
                
                
                        
                
                
                
    }
}

Code source // GITHUB