Simple Calculator Made In Java

package javaapplication4;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.math.*;
import java.lang.*;
public class JavaApplication4 extends JFrame
{
    JLabel l1,l2;
    JButton b1,b2,b3,b4;
    JTextField t1,t2,r;
public JavaApplication4()
 {
     setLayout( new GridBagLayout());
     GridBagConstraints c= new GridBagConstraints();
     l1= new JLabel("Num1");
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=0;
     c.gridy=0;
     add(l1,c);
    
     t1 = new JTextField(10);
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=1;
     c.gridy=0;
     c.gridwidth=3;
     add(t1,c);
    
     l2= new JLabel("Num2");
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=0;
     c.gridy=1;
     add(l2,c);
    
     t2 = new JTextField(10);
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=1;
     c.gridy=1;
     c.gridwidth=3;
     add(t2,c);
     
    
     b1 = new JButton("+");
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=0;
     c.gridy=2;
c.gridwidth=1;    
add(b1,c);    
b2 = new JButton("-");
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=1;
     c.gridy=2;
c.gridwidth=1;    
add(b2,c);
b3 = new JButton("*");
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=2;
     c.gridy=2;
add(b3,c);
     c.gridwidth=1;    
     b4 = new JButton("/");
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=3;
     c.gridy=2;
c.gridwidth=1;    
     add(b4,c);
     r = new JTextField("Result");
     c.fill=GridBagConstraints.HORIZONTAL;
     c.gridx=0;
     c.gridy=3;
     c.gridwidth=4;
     add(r,c);
 
 event e = new event();
 b1.addActionListener(e);
 b2.addActionListener(e);
 b3.addActionListener(e);
 b4.addActionListener(e);  
 }
public class event implements ActionListener
    {
    public void actionPerformed(ActionEvent e)
    {
       double number1,number2;
       try
       {
       number1 =(int)(Double.parseDouble(t1.getText()));
       }
       catch(NumberFormatException a)
       {
        r.setText("Invalid Value In Field 1");
       return;
       }
       try
       {
       number2 =(int)(Double.parseDouble(t2.getText()));
       }
       catch(NumberFormatException a)
       {
        r.setText("Invalid Value In Field 2");
       return;
       }
       
       String s = e.getActionCommand();
       if(s.equals("+"))
       {
           double sum;
           sum= number1+number2;
       r.setText(number1 + "+"+number2 + "=" + sum);
       }
       if(s.equals("-"))
       {
           double sum;
           sum= number1-number2;
       r.setText(number1 + "-"+number2 + "=" + sum);
       }
       if(s.equals("*"))
       {
           double sum;
           sum= number1*number2;
       r.setText(number1 + "*"+number2 + "=" + sum);
       }
       if(s.equals("/"))
       {
           double sum;
           if(number2==0)
           {
           r.setText("Cannot Divide By Zero");
           }
           else{sum= number1/number2;
       r.setText(number1 + "/"+number2 + "=" + sum);
           }
      
       }
      
      
    }
}
    public static void main(String[] args) {
        JavaApplication4 gui = new JavaApplication4();
       gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        gui.setTitle("Simple Calculator");
        gui.setVisible(true);
        gui.setSize(500, 500);
    }
   
}

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