Thread: Help needed with calculator code

so guys here's my code for a simple calculator....please help me with ways on how to improve it....i.e any scientific features plus the layout etc

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
 
public class MyCal {
JFrame frame=new JFrame();
JPanel panel = new JPanel();
JTextField txt1= new JTextField();
JTextField txt2= new JTextField();
JTextField txt3= new JTextField();
JButton btnadd = new JButton("+");
JButton btnmul = new JButton("x");
JButton btnsub = new JButton("-");
JButton btndiv = new JButton("/");
JLabel lbl1 = new JLabel("number1");
JLabel lbl2 = new JLabel("number2");
JLabel lbl3 = new JLabel("answer");
 
 
 
public void AddTxtField(){
txt1.setBounds(100, 50, 150, 20);
txt2.setBounds(100, 70, 150, 20);
txt3.setBounds(100, 90, 150, 20);
panel.add(txt1);
panel.add(txt2);
panel.add(txt3);
 
 
lbl1.setBounds(10, 50, 150, 20);
panel.add(lbl1);
 
lbl2.setBounds(10, 70, 150, 20);
panel.add(lbl2);
 
lbl3.setBounds(10, 90, 150, 20);
panel.add(lbl3);
 
 
}
public void Addbottons(){
btnadd.setBounds(100, 115, 100, 20);
btnadd.addActionListener(new addhandaler());
panel.add(btnadd);
}
 
 
public void Multiplybutton(){
btnmul.setBounds(100,140, 100, 20);
btnmul.addActionListener(new mulhandaler());
panel.add(btnmul);
}
 
 
public void Divisionbutton(){
btndiv.setBounds(210, 115, 100, 20);
btndiv.addActionListener(new divhandaler());
panel.add(btndiv);
}
 
public void Subtractionbutton(){
btnsub.setBounds(210, 140, 100, 20);
btnsub.addActionListener(new subhandaler());
panel.add(btnsub);
}
 
 
class addhandaler implements ActionListener{
public void actionPerformed(ActionEvent e) {
int num1= Integer.parseInt(txt1.getText());
int num2= Integer.parseInt(txt2.getText());
int numtotal= num1+num2;
txt3.setText(String.valueOf(numtotal));
 
}
 
}
 
class subhandaler implements ActionListener{
public void actionPerformed(ActionEvent e) {
int num1= Integer.parseInt(txt1.getText());
int num2= Integer.parseInt(txt2.getText());
int numtotal= num1-num2;
txt3.setText(String.valueOf(numtotal));
 
}
 
}
 
class mulhandaler implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
int num1= Integer.parseInt(txt1.getText());
int num2= Integer.parseInt(txt2.getText());
int numtotal= num1*num2;
txt3.setText(String.valueOf(numtotal));
 
}
 
}
 
class divhandaler implements ActionListener{
public void actionPerformed(ActionEvent e) {
int num1= Integer.parseInt(txt1.getText());
int num2= Integer.parseInt(txt2.getText());
int numtotal= num1/num2;
txt3.setText(String.valueOf(numtotal));
 
}
 
}
 
public void CreateFrom(){
frame.setTitle("Cal");
frame.setSize (400, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.setLayout(null);
 
}public MyCal( ){
CreateFrom ();
AddTxtField();
Addbottons();
Divisionbutton();
Multiplybutton();
Subtractionbutton();
frame.add(panel);
frame.setVisible(true);
 
 
}
public static void main(String[] args) {
new MyCal();
}
 
}