duplicate class

import javax.swing.*;
import java.awt.event.*;

public class Calculator extends JFrame implements ActionListener{

    JTextField CoA, CoB, CoC;

    
     JLabel Root1, Root2;
     JLabel CoAx, CoBx, CoCx, Root1x, Root2x;
     JButton calculateB, exitB;
     CalButton cbHandler;
     JButton ExitButton ;

    public Calculator() {

        setTitle("Quadratic Calculator");      

        
        CoAx = new JLabel("a", SwingConstants.CENTER);
        CoBx = new JLabel("b", SwingConstants.CENTER);
        CoCx = new JLabel("c", SwingConstants.CENTER);
        Root1x = new JLabel("Root1", SwingConstants.CENTER);
        Root2x = new JLabel("Root2", SwingConstants.CENTER);

        
        CoA = new JTextField(10);
        CoB = new JTextField(10);
        CoC = new JTextField(10);
        Root1 = new JLabel("", SwingConstants.RIGHT);
        Root2 = new JLabel("", SwingConstants.RIGHT);

       
        calculateB = new JButton("Calculate");
        cbHandler = new CalculateButtonHandler();(the error here is saying to create a class)
        calculateB.addActionListener(cbHandler);

        //Create Exit Button
        exitB = new JButton("Exit");
        ebHnandler = new ExitButton();(here it telling me to create a class in package)
        exitB.addActionListener(ebHandler);(telling to create a local variable
        Container pane = getContentPane();
        pane.setLayout(new GridLayout(6, 2));

        
        pane.add(CoAx);
        pane.add(CoA);
        pane.add(CoBx);
        pane.add(CoB);
        pane.add(CoCx);
        pane.add(CoC);
        pane.add(Root1x);
        pane.add(Root1);
        pane.add(Root2x);
        pane.add(Root2);
        pane.add(calculateB);
        pane.add(exitB);

        setSize(400, 300);
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

    }

    @Override
    public void actionPerformed(ActionEvent ae) {
            
            double a = Double.parseDouble(CoA.getText());
            double b = Double.parseDouble(CoB.getText());
            double c = Double.parseDouble(CoC.getText());

            double det = (4 * a * c);
            b = b * b;

            double R1 = Math.sqrt(b + det);
            double R2 = Math.sqrt(b - det);

            Root1.setText("" + R1);
            Root2.setText("" + R2);
    }

    private class CalButton implements ActionListener
    {

        @Override
        public void actionPerformed(ActionEvent ae) {
                
        }

        

    }
    private class ExitsButton implements ActionListener{

    @Override
    public void actionPerformed(ActionEvent e) {

        System.exit(0);

    }
  }
     public static void main ( String[] args)

    {

        Calculator cal = new Calculator();

    }

}




    

 cbHandler = new CalculateButtonHandler();- the error here is saying: create a class calculatebuttonhandler in simplecalculator

ebHnandler = new ExitButton(); - this error here is telling me to create a class in package simple calculator
        exitB.addActionListener(ebHandler);-this error here is saying, to cast ebhandler to actionlistener

 public static  void main ( String[] args){
this is the main, the error here is: illegal static declaration in inner class calculator2: Calculator
       
    }

  public static   void main ( String[] args){

    }

// legal
public class Calculator2  ...
[
    public static void main(String[] args)
    {
        ...
    {
    
    public class CalculatorExitsButton  ...
    {
        ...

// illegal
public class Calculator2 ...
{
    ...

    public class CalculatorExitsButton  ...
    {
        public static void main(String[] args)
        {
            ...