import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class TestShells {
	public static void main(String[] args) {
		Display display = new Display();
		boolean condition1=false;
		boolean condition2=false;

		if(condition1) {
			new Shell1();
			eventLoop(display);
		}

		if(condition2) {
			new Shell2();
			eventLoop(display);
		}

		new Shell3();
		eventLoop(display);

		display.dispose();
	}

	/**
	 * @param display
	 */
	 private static void eventLoop(Display display) {
		 while (display.getShells().length > 0) {
			 if (!display.readAndDispatch()) {
				 display.sleep();
			 }
		 }
	 }
}

class Shell1 {
	Shell1() {
		Display display = Display.getDefault();
		Shell shell = new Shell(display);
		shell.setText("Shell 1");
		shell.open();
	}
}

class Shell2 {
	Shell2() {
		Display display = Display.getDefault();
		Shell shell = new Shell(display);
		shell.setText("Shell 2");
		shell.open();
	}
}

class Shell3 {
	Shell3() {
		Display display = Display.getDefault();
		Shell shell = new Shell(display);
		shell.setText("Shell 3");
		shell.open();
	}
}