division of numbers using GUI

import java.awt.*;
import java.net.*;
import java.awt.event.*;

class awt extends Frame{
        awt(){
             Label num1=new Label("Number1");
            num1.setBounds(20,50,80,10);
           TextField number1 =new TextField();
           number1.setBounds(100,50,100,20);
           Label num2=new Label("Number2");
            num2.setBounds(20,70,80,10);
            TextField number2 =new TextField();
          number2.setBounds(100,70,100,20);
          Button b=new Button("Add");
          b.setBounds(100,120,65,20);
          Label l1=new Label("Result :");
          l1.setBounds(20,90,80,20);
          TextField t=new TextField();
          t.setBounds(100,90,100,20);
          //Checkbox c =new Checkbox("c++");
          //c.setBounds(300,300,50,50);
           add(num1);
           add(number1);
           add(num2);
           add(number2);
           add(b);
           add(l1);
           add(t);
           //add(c);
           setSize(400,400);
           setLayout(null);
           setVisible(true);

           b.addActionListener(new ActionListener(){
              public void actionPerformed(ActionEvent e) {
                try{ 
                    int a = Integer.parseInt(number1.getText());
                    int b = Integer.parseInt(number2.getText()); 
                    int c = a / b; 
                
                        t.setText(String.valueOf(c)); 
                    }
                    catch(ArithmeticException z){
                      t.setText("invalid");
                    }
                

                }
          }); 
        }
        public static void main(String[] args){
          awt a=new awt();
         
        }
}