Степени на 2

package Zadachi;

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

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.JTextArea;

public class StepeniNa2 {

    private JFrame frame;
    private JTextField textField1;
    private JTextField textField2;
    private JLabel lblNewLabel;
    private JLabel lblNewLabel_1;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    StepeniNa2 window = new StepeniNa2();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public StepeniNa2() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame =new JFrame();
        frame.setTitle("\u0421\u0442\u0435\u043F\u0435\u043D\u0438 \u043D\u0430 \u0447\u0438\u0441\u043B\u043E\u0442\u043E 2");
        frame.setBounds(100, 100, 450, 190);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        textField1 = new JTextField();
        textField1.setBounds(10, 49, 103, 20);
        frame.getContentPane().add(textField1);
        textField1.setColumns(10);

        textField2 = new JTextField();
        textField2.setText("");
        textField2.setBounds(154, 49, 103, 20);
        frame.getContentPane().add(textField2);
        textField2.setColumns(10);

        JTextArea textArea = new JTextArea();
        textArea.setBounds(27, 104, 380, 28);
        frame.getContentPane().add(textArea);

        JButton btnNewButton = new JButton("\u041F\u0440\u0435\u0441\u043C\u0435\u0442\u043D\u0438");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            int a=Integer.parseInt(textField1.getText());
            int b=Integer.parseInt(textField2.getText());
            for (int i=a; i <b+1; i ++) {
                if (i>0&&i==Math.pow(2,Math.round(Math.log(i)/Math.log(2)))) {
                    textArea.setText(textArea.getText()+" "+Integer.toString(i));

                }
            }
            }
        });
        btnNewButton.setBounds(318, 48, 89, 23);
        frame.getContentPane().add(btnNewButton);

        lblNewLabel = new JLabel("\u041D\u0430\u0447\u0430\u043B\u043E \u043D\u0430 \u0438\u043D\u0442\u0435\u0440\u0432\u0430\u043B\u0430");
        lblNewLabel.setBounds(10, 18, 123, 20);
        frame.getContentPane().add(lblNewLabel);

        lblNewLabel_1 = new JLabel("\u041A\u0440\u0430\u0439 \u043D\u0430 \u0438\u043D\u0442\u0435\u0440\u0432\u0430\u043B\u0430");
        lblNewLabel_1.setBounds(154, 21, 134, 14);
        frame.getContentPane().add(lblNewLabel_1);




    }
}