import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.PointerInfo;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class Linkki {

private static Listener listener = new MouseEnterExitListener();
public static Shell shell;

 public static void main(String[] args) {
   Display display = new Display();
   shell = new Shell(display);
   Label label = new Label(shell, SWT.SHADOW_IN | SWT.CENTER);

   label.setText("Point your cursor here ...");
   label.setBounds(10, 10, 200, 15);

   label.addListener(SWT.MouseEnter, listener);
   label.addListener(SWT.MouseExit, listener);

   shell.setSize(260, 120);
   shell.open();

   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) {
       display.sleep();
     }
   }
 }

}

class MouseEnterExitListener implements Listener {
private static Shell tooltipShell;
private static Label tooltipLabel;
public void handleEvent(Event e) {
    switch (e.type) {
    case SWT.MouseEnter:
     if(tooltipShell!=null && !tooltipShell.isDisposed())
      tooltipShell.dispose();
     tooltipShell = new Shell(Linkki.shell, SWT.ON_TOP | SWT.NO_FOCUS | SWT.TOOL);
        FillLayout layout = new FillLayout();
        layout.marginWidth = 5;
        tooltipShell.setLayout(layout);
        tooltipLabel = new Label(tooltipShell, SWT.NONE);
        tooltipLabel.setText("kek");
        tooltipShell.pack();
        PointerInfo a = MouseInfo.getPointerInfo();
  Point b = a.getLocation();
  int x = (int) b.getX();
  int y = (int) b.getY();
  tooltipShell.setLocation(x-10, y-10);
  tooltipShell.setVisible(true);
  tooltipShell.addListener(SWT.MouseExit, new Listener() {
        public void handleEvent(Event e) {
         tooltipShell.dispose();
          tooltipShell = null;
          tooltipLabel = null;
          }
        });
     break;
    }
}
}

 try {
  Thread.sleep(1000);
 } catch (InterruptedException e) {
  //do something
 }
 System.out.println("Delayed for one second!");
}