класс Main
import java.awt.*;

public class Main {

    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MyWindow frame = new MyWindow("Очень удобное окно");

                //frame.pack();
                //frame.setSize(30,30);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });


    }
}


класс MyWindow
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.FileNotFoundException;
import java.io.IOException;

/**
 * Created by Kubitskivlad on 21.11.16.
 */
public class MyWindow extends JFrame {

    String sX = "";
    String sY = "";
    String sXX = "";
    String sYY = "";
    StringBuffer sss = new StringBuffer("");
    double x = 0.0;
    double y = 0.0;
    double xx = 0.0;
    double yy = 0.0;
    char backSpace = KeyEvent.VK_BACK_SPACE;
    char ch ;

    MyWindow(String nameFrame)
    {
        super(nameFrame);
        setDefaultCloseOperation(EXIT_ON_CLOSE);


        JPanel panel  = new JPanel();
        panel.setLayout(null);

        final JButton button = new JButton();
        button.setSize(300,50);
        button.setLocation(100,100);
        panel.add(button);

        final JTextField textFieldX = new JTextField(25);
        textFieldX.setEditable(false);
        final JTextField textFieldY = new JTextField(25);
        textFieldY.setEditable(false);
        textFieldX.setSize(100,30);
        textFieldY.setSize(100,30);
        textFieldX.setLocation(900,615);
        textFieldY.setLocation(900,650);

        panel.add(textFieldX);
        panel.add(textFieldY);

        panel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                button.setLocation(e.getX(),e.getY());

            }
        });
        panel.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseMoved(MouseEvent e) {
                x = e.getX();
                sX = Double.toString(x);
                textFieldX.setText(sX);
                y = e.getY();
                sY = Double.toString(y);
                textFieldY.setText(sY);
            }
        });

        button.addKeyListener(new KeyAdapter() {
            @Override
            public void keyTyped(KeyEvent e) {
                try
                {
                    if (e.getKeyChar() == backSpace) {
                        sss.deleteCharAt(sss.length() - 1);
                        button.setText(sss.toString());
                    } else  {
                        ch = e.getKeyChar();
                        sss.append(ch);
                        button.setText(sss.toString());

                    }
                }
                catch(StringIndexOutOfBoundsException ee)
                {
                    JOptionPane.showMessageDialog(null, "Есть проблемы");
                }

            }
        });

        button.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseMoved(MouseEvent e) {
                x = e.getX();
                xx = button.getX();
                sXX = Double.toString(xx +x);
                textFieldX.setText(sXX);

                y = e.getY();
                yy = button.getY();
                sYY = Double.toString(yy + y);
                textFieldY.setText(sYY);
            }
        });
        button.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                if (e.isControlDown())
                {
                    button.setLocation(button.getX() + e.getX(),button.getY() + e.getY());

                }
                x = e.getX();
                xx = button.getX();
                sXX = Double.toString(xx +x);
                textFieldX.setText(sXX);

                y = e.getY();
                yy = button.getY();
                sYY = Double.toString(yy + y);
                textFieldY.setText(sYY);
            }
        });
        panel.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                x = e.getX();
                xx = button.getX();
                sXX = Double.toString(xx +x);
                textFieldX.setText(sXX);

                y = e.getY();
                yy = button.getY();
                sYY = Double.toString(yy + y);
                textFieldY.setText(sYY);
            }
        });

        setContentPane(panel);
        setSize(1000,700);
    }
}