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

public class Interp_1a extends JFrame
{
    private JPanel panel;
    private JLabel msgLabel;
    private JTextArea inputTextArea;
    private JTextArea outputTextArea;
    private JButton compileButton;

    public Interp_1a()
    {
        setTitle("Interpreter w getToken()");
        setSize(300, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        buildPanel();
        add(panel);
        setVisible(true);
    }

    private void buildPanel()
    {
        msgLabel = new JLabel ("");

        inputTextArea = new JTextArea(10,10);
        inputTextArea.setBackground(Color.yellow);
        inputTextArea.setForeground(Color.black);

        outputTextArea = new JTextArea(10,10);
        outputTextArea.setBackground(Color.green);
        outputTextArea.setForeground(Color.black);

        compileButton = new JButton("Compile");

        compileButton.addActionListener(new CompileListener());

        panel = new JPanel();

        panel.add(msgLabel);
        panel.add(inputTextArea);
        panel.add(outputTextArea);
        panel.add(compileButton);
    }

    public static void main(String[] args)
    {
        Interp_1a InterpObj = new Interp_1a();
    }

    private class CompileListener implements ActionListener
    {
        public void actionPerformed (ActionEvent e)
        {
            String exp;
            Interpreter InterpObj = new Interpreter();

            exp = inputTextArea.getText() + " "; // get expression from input area

            InterpObj.p = exp.toCharArray(); // convert input text to be read by interpreter
            InterpObj.counter = 0;

            double num = InterpObj.AddSub(); // doing the math
            String str = Double.toString(num); // change result into string

            outputTextArea.setText(" " + str + "\n ");
        }
    }
}