public TableLayout(int rows, int columns, int hgap, int vgap) {
		nRows = rows;
		nColumns = columns;
		hGap = hgap;
		vGap = vgap;
		horizontalAlignment = CENTER;
		verticalAlignment = CENTER;
		defaultFill = BOTH;
		constraintTable = new HashMap();
		layoutTable = null;
	}