My Problem

import javax.swing.*;

public class Main {

    private static JFrame frame = new JFrame("Binaries and Decimals");
    private static JPanel panel = new JPanel();
    private static JTextField text = new JTextField(20);
    private static JTextArea out = new JTextArea();
    private static JButton enter = new JButton("enter");
    private static JButton button = new JButton("convert");
    private static String[] options = {"Binary to Decimal", "Decimal to Binary"};
    private static JComboBox box = new JComboBox(options);

    public static void main(String[] args) {
        window();
        enter.addActionListener(e -> mode());

    }

    private static void mode() {
        out.setText("");
        if (box.getSelectedItem().equals("Binary to Decimal")) {
            bintodec();
        } else if (box.getSelectedItem().equals("Decimal to Binary")) {
            dectobin();
        }
    }

    private static void window() {

        panel.add(box);
        panel.add(text);
        panel.add(enter);
        panel.add(button);
        out.setEditable(false);
        panel.add(out);
        frame.setContentPane(panel);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(600, 250);
        frame.setResizable(false);
        frame.setVisible(true);


    }

    private static void bintodec() {
        out.setText("");
        String bin = text.getText();
        String dec = "Your number as decimal: " + Integer.parseInt(bin, 2);
        button.addActionListener(e -> out.setText(dec));
        out.revalidate();


    }

    private static void dectobin() {
        out.setText("");
        String in = text.getText();
        int dec = Integer.parseInt(in);
        int waste;
        String bin = "";
        while (dec > 0) {
            waste = dec % 2;
            dec = dec / 2;
            bin = bin + waste;
        }
        String finalBin = "Your number as binary: " + new StringBuilder(bin).reverse().toString();
        button.addActionListener(e -> out.setText(finalBin));
        out.revalidate();

    }


}