import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class EnterTest {

	public static void main(String[] args) {
		final Display display = new Display();

		final Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());

		final Tree tree = new Tree(shell, SWT.BORDER);
		final TreeItem item = new TreeItem(tree, 0);
		item.setText("a node");

		tree.addListener(SWT.KeyDown, new Listener() {
			@Override
			public void handleEvent(Event event) {
				System.out.println(event.keyCode + "  " + Integer.valueOf(event.character));
			}
		});

		shell.setSize(400, 200);
		shell.open();

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

		display.dispose();
	}
}