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

public class Main{
    JTextField tf1 = new JTextField("0",10);
    JTextField tf2 = new JTextField("0",15);
    JFrame frame = new JFrame("Main Frame");
    JFrame resultFrame = new JFrame("Result Frame");
    public Main()
    {
        try {
            frame.setSize(300,200);
            frame.setVisible(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(null);
            JLabel label = new JLabel("Enter 2 numbers");
            frame.add(label);
            frame.add(tf1);
            frame.add(tf2);
            tf1.setVisible(true);
            tf2.setVisible(true);
            label.setVisible(true);
            label.setBounds(0,0,150,50);
            tf1.setBounds(151,11,30,30);
            tf2.setBounds(251,11,30,30);
            JLabel label2 = new JLabel("+");
            label2.setVisible(true);
            frame.add(label2);
            label2.setBounds(201,21,10,10);
            JButton result = new JButton("Go to Result Frame");
            frame.add(result);
            result.setVisible(true);
            result.setBounds(50,100,150,30);
            result.addActionListener(new Result());
            resultFrame.setVisible(false);
        }
        catch (Exception e)
        {
            JOptionPane.showMessageDialog(null, "Only numbers are allowed", "Invalid Input", JOptionPane.ERROR_MESSAGE);
        }

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

        Main m = new Main();

    }
    public class Result implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
            // TODO Auto-generated method stub
            try {
                resultFrame.setSize(300,200);
                resultFrame.setVisible(true);
                resultFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                resultFrame.setLayout(null);
                String a =tf1.getText();
                String b =tf2.getText();
                int sum=Integer.parseInt(a)+Integer.parseInt(b);
                JLabel label = new JLabel("Result");
                resultFrame.add(label);
                resultFrame.add(tf1);
                tf1.setVisible(true);
                label.setVisible(true);
                label.setBounds(0,0,150,50);
                tf1.setBounds(151,11,30,30);
                a=String.valueOf(sum);
                tf1.setText(a);
                JButton result = new JButton("Go to Main Frame");
                resultFrame.add(result);
                result.setVisible(true);
                result.setBounds(50,100,150,30);
                result.addActionListener(new Result());
                resultFrame.setVisible(true);
                frame.setVisible(false);
                result.addActionListener(new Class1());

        }catch (Exception e1){
                JOptionPane.showMessageDialog(null, "Only numbers are allowed", "Invalid Input", JOptionPane.ERROR_MESSAGE);
            }

    }
    public class Class1 implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
            resultFrame.setVisible(false);
            new Main();
        }
    }
}}