README.md

import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.JButton; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar;

import javax.swing.JTextField;

public class Project extends JFrame {

private static final long serialVersionUID = 3386380211796249949L;

private static JMenuBar  menubar;
private static JButton cal;
public static JCheckBoxMenuItem add,sub,div,multi;

public Project() {

	initUI();
}

private void initUI() {

//items inside the frame or window

	createMenuBar();
	windowitem(); 
	setTitle("Calculate");
	setSize(360, 350);
	setLocationRelativeTo(null);
	setDefaultCloseOperation(EXIT_ON_CLOSE);
}

//window items

public void windowitem() {
	setLayout(null);

	JLabel val1 = new JLabel("First  Value");
	val1.setBounds(10,10,80,30);
	add(val1);

	final JTextField value1 = new JTextField();
	value1.setBounds(100,10,160,25);
	add(value1);

	JLabel val2 = new JLabel("Second Value");
	val2.setBounds(10,40,80,25);
	add(val2);

	final JTextField value2 = new JTextField();
	value2.setBounds(100,40,160,25);
	add(value2);

	final JLabel ans = new JLabel("Answer");
	ans.setBounds(10,70,80,25);
	ans.setVisible(false);
	add(ans);

	final JTextField answer = new JTextField();
	answer.setBounds(100,70,160,25);
	answer.setVisible(false);
	add(answer);

	final JLabel ans2 = new JLabel("Answer2");
	ans2.setBounds(10,100,80,25);
	ans2.setVisible(false);
	add(ans2);
	
	final JTextField answer2 = new JTextField();
	answer2.setBounds(100,100,160,25);
	answer2.setVisible(false);
	add(answer2);
	
	final JLabel ans3 = new JLabel("Answer3");
	ans3.setBounds(10,130,80,25);
	ans3.setVisible(false);
	add(ans3);

	final JTextField answer3 = new JTextField();
	answer3.setBounds(100,130,160,25);
	answer3.setVisible(false);
	add(answer3);
	
	final JLabel ans4 = new JLabel("Answer4");
	ans4.setBounds(10,160,80,25);
	ans4.setVisible(false);
	add(ans4);
	
	final JTextField answer4 = new JTextField();
	answer4.setBounds(100,160,160,25);
	answer4.setVisible(false);
	add(answer4);
	
	cal = new JButton("Calculate");
	cal.setBounds(130,70,90,25);
	add(cal);

//action to be performed by the button if the checkbox is selected

		cal.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent arg0) {
				
				
				String a,b;
				a=value1.getText();
				b=value2.getText();
				double  in1, in2, ad, s, d, m ;
				in1 = Double.parseDouble(a);
				in2 = Double.parseDouble(b);
				
				ad = in1 + in2;
				s = in1 - in2;
				d = in1 * in2;
				m = in1 / in2;
				
				
				if(add.getState()==true){
					answer.setText("Sum is: "+ ad );
					ans.setVisible(true);
					ans2.setVisible(false);
					ans3.setVisible(false);
					ans4.setVisible(false);
					answer.setVisible(true);
					answer2.setVisible(false);
					answer3.setVisible(false);
					answer4.setVisible(false);
					cal.setBounds(130,100,90,25);
				}
				else if ((add.getState()==true)&&(sub.getState()==true)&& (div.getState()==false)&& (multi.getState()==false)){
					answer.setText("Sum is: " + ad );
					answer2.setText("Difference is: "+ s );
					ans.setVisible(true);
					ans2.setVisible(true);
					ans3.setVisible(false);
					ans4.setVisible(false);
					answer.setVisible(true);
					answer2.setVisible(true);
					answer3.setVisible(false);
					answer4.setVisible(false);
				}
				else if (sub.getState()==true){
					answer2.setText("Difference is: " + s );
					ans.setVisible(false);
					ans2.setVisible(true);
					ans3.setVisible(false);
					ans4.setVisible(false);
					answer.setVisible(false);
					answer2.setVisible(true);
					answer3.setVisible(false);
					answer4.setVisible(false);
					cal.setBounds(130,130,90,25);
				}
				else if (multi.getState()==true){
					answer3.setText("Pruduct is: " + m );
					ans.setVisible(false);
					ans2.setVisible(false);
					ans3.setVisible(true);
					ans4.setVisible(false);
					answer.setVisible(false);
					answer2.setVisible(false);
					answer3.setVisible(true);
					answer4.setVisible(false);
					cal.setBounds(130,160,90,25);
				}
				else if ((add.getState()==true) && (sub.getState()==true) && (div.getState()==true) && (multi.getState()==false)){
					answer.setText("Sum is: " + ad );
					answer2.setText("Difference is: "+ s );
					answer3.setText("Pruduct is: " + m );
					ans.setVisible(true);
					ans2.setVisible(true);
					ans3.setVisible(true);
					ans4.setVisible(false);
					answer.setVisible(true);
					answer2.setVisible(true);
					answer3.setVisible(true);
					answer4.setVisible(false);
				}
				else if (div.getState()==true){
					answer4.setText("Quotient is: " + d);
					ans.setVisible(false);
					ans2.setVisible(false);
					ans3.setVisible(false);
					ans4.setVisible(true);
					answer.setVisible(false);
					answer2.setVisible(false);
					answer3.setVisible(false);
					answer4.setVisible(true);
					cal.setBounds(130,190,90,25);
				}
				else if ((add.getState()==true) && (sub.getState()==true) && (div.getState()==true) && (multi.getState()==true)){
					answer.setText("Sum is: " + ad );
					answer2.setText("Difference is: "+ s );
					answer3.setText("Product is: " + m );
					answer4.setText("Quotient is: " + d);
					ans.setVisible(true);
					ans2.setVisible(true);
					ans3.setVisible(true);
					ans4.setVisible(true);
					answer.setVisible(true);
					answer2.setVisible(true);
					answer3.setVisible(true);
					answer4.setVisible(true);
				}
				else{
					answer.setText("Invalid input");
					ans.setVisible(false);
					ans2.setVisible(false);
					ans3.setVisible(false);
					ans4.setVisible(false);
					answer.setVisible(true);
					answer2.setVisible(false);
					answer3.setVisible(false);
					answer4.setVisible(false);
					cal.setBounds(130,100,90,25);
				}
			}});	
			
			
		}

// creates the menubar and the file menu containing the operations

public void createMenuBar() {

//menu bar and items

    menubar = new JMenuBar();
	JMenu fileMenu = new JMenu("File");
	fileMenu.setMnemonic(KeyEvent.VK_F);

	add = new JCheckBoxMenuItem("Add");
	add.setMnemonic(KeyEvent.VK_A);
	add.setSelected(false);

	sub = new JCheckBoxMenuItem("Subtract");
	sub.setMnemonic(KeyEvent.VK_S);
	sub.setSelected(false);

	multi = new JCheckBoxMenuItem("Multiply");
	multi.setMnemonic(KeyEvent.VK_M);
	multi.setSelected(false);

	div = new JCheckBoxMenuItem("Divide");
	div.setMnemonic(KeyEvent.VK_D);
	div.setSelected(false);
	
	fileMenu.add(add);
	fileMenu.add(sub);
	fileMenu.add(multi);
	fileMenu.add(div);

	menubar.add(fileMenu);	

	setJMenuBar(menubar);
}

//main public static void main(String[] args) {

	EventQueue.invokeLater(new Runnable() {

		@Override
		public void run() {
			Project ex = new Project();
			ex.setVisible(true);
		}
	});

}

}