public void actionPerformed(ActionEvent e) {
			if (btnReadRow == e.getSource()) {
				try {
					readRow();
				} catch (Exception e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			} else if (btnWriteRow == e.getSource()) {
				writeRow();
			} else if (btnReadCol == e.getSource()) {
				try {
					readCol();
				} catch (Exception e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			} else if (btnWriteCol == e.getSource()) {
				writeCol();
			} else if (btnModRow == e.getSource()) {
				modifyRow();
			} else if (btnModCol == e.getSource()) {
				modifyCol();
			}
			
		}