java-calculator/calculator.java at main · SnehalTanpure7/java-calculator · GitHub

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import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
public class calculator implements ActionListener
{
     static JTextField j1;
     double num1,num2,result;
     String operator;
    public static void main(String args[])
   {
       JFrame f1=new JFrame();
       MenuBar mb1=new MenuBar();
       f1.setMenuBar(mb1);
       Menu m1=new Menu("File");
       mb1.add(m1);
       Menu m2=new Menu("Edit");
       mb1.add(m2);
       Menu m3=new Menu("Help");
       mb1.add(m3);
       MenuItem a1=new MenuItem("Clear");
       m1.add(a1);
       MenuItem bb1=new MenuItem("Exit");
       m1.add(bb1);
       MenuItem c1=new MenuItem("Copy");
       m2.add(c1);
       MenuItem d1=new MenuItem("Paste");
       m2.add(d1);
       MenuItem e1=new MenuItem("About Calculator");
       m3.add(e1);


        j1=new JTextField();
        j1.setBounds(50,10,270,30);

       JButton b1=new JButton("1");
       b1.setBounds(50,50,50,50);
       JButton b2=new JButton("2");
       b2.setBounds(120,50,50,50);
       JButton b3=new JButton("3");
       b3.setBounds(190,50,50,50);
       JButton b4=new JButton("/");
       b4.setBounds(260,50,50,50);

       JButton b5=new JButton("4");
       b5.setBounds(50,130,50,50);
       JButton b6=new JButton("5");
       b6.setBounds(120,130,50,50);
       JButton b7=new JButton("6");
       b7.setBounds(190,130,50,50);
       JButton b8=new JButton("*");
       b8.setBounds(260,130,50,50);

       JButton b9=new JButton("7");
       b9.setBounds(50,210,50,50);
       JButton b10=new JButton("8");
       b10.setBounds(120,210,50,50);
       JButton b11=new JButton("9");
       b11.setBounds(190,210,50,50);
       JButton b12=new JButton("-");
       b12.setBounds(260,210,50,50);

       JButton b13=new JButton("0");
        b13.setBounds(50,290,50,50);

       JButton b14=new JButton(".");
          b14.setBounds(120,290,50,50);

       JButton b15=new JButton("+");
       b15.setBounds(190,290,50,50);

       JButton b16=new JButton("=");
       b16.setBounds(260,290,50,50);

      // better action perfomance
      calculator obj=new calculator();
        b1.addActionListener(obj);
        b2.addActionListener(obj);
        b3.addActionListener(obj);
        b4.addActionListener(obj);
        b5.addActionListener(obj);
        b6.addActionListener(obj);
        b7.addActionListener(obj);
        b8.addActionListener(obj);
        b9.addActionListener(obj);
        b10.addActionListener(obj);
        b11.addActionListener(obj);
        b12.addActionListener(obj);
        b13.addActionListener(obj);
        b14.addActionListener(obj);
        b15.addActionListener(obj);
        b16.addActionListener(obj);


       f1.add(j1);
       f1.add(b1);
       f1.add(b2);
       f1.add(b3);
       f1.add(b4);
       f1.add(b5);
       f1.add(b6);
       f1.add(b7);
       f1.add(b8);
       f1.add(b9);
       f1.add(b10);
       f1.add(b11);
       f1.add(b12);
       f1.add(b13);
       f1.add(b14);
       f1.add(b15);
       f1.add(b16);
       f1.setSize(500,500);
       f1.setLayout(null);
       f1.setVisible(true);
}
public void actionPerformed(ActionEvent e)
    {
        String s = e.getActionCommand();

                if(s.matches("[0-9]") || s.equals("."))
        {
            j1.setText(j1.getText() + s);
        }

        // Operator click
        else if(s.equals("+") || s.equals("-") || s.equals("*") || s.equals("/"))
        {
            num1 = Double.parseDouble(j1.getText());
            operator = s;
            j1.setText("");
        }

                else if(s.equals("="))
        {
            num2 = Double.parseDouble(j1.getText());

            if(operator.equals("+"))
                result = num1 + num2;
            else if(operator.equals("-"))
                result = num1 - num2;
            else if(operator.equals("*"))
                result = num1 * num2;
            else if(operator.equals("/"))
                result = num1 / num2;

            j1.setText(String.valueOf(result));
        }
    }
}