//The following two lines are needed to open and close a window.
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

//The following two lines are needed to let the window repaint itself.
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;

//The following two lines are needed for what we want to draw in the window.
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;

public class For2SWT {
	public static void main(String[] args) {

		//The following two lines are needed to open the window.
		final Display display = new Display();
		final Shell shell = new Shell(display);

		shell.addPaintListener(new PaintListener() {
			public void paintControl(PaintEvent e) {

				GC gc = e.gc;	//Graphics Context
				Color color = new Color(display, 0, 0, 0); //rgb
				gc.setBackground(color);

				for (int row = 0; row < 10; ++row) {
					for (int col = 0; col < 10; ++col) {
						gc.fillRectangle(25 * col, 25 * row, 20, 20);
					}
				}

				//Don't need color or gc any more.
				color.dispose();
				gc.dispose();
			}
		});

		shell.setText("10 rows and 10 columns of squares");
		shell.open();

		//The following six lines are needed to close the window.
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}
}