import javax.swing.UIManager;import java.awt.*;/** * 學生管理系統運行主類 */public class StuMS {	boolean packFrame = false;	/**	 * 構造函數	 */	public StuMS() {		StuMain frame = new StuMain();		if (packFrame) {			frame.pack();		}		else {			frame.validate();		}		//設置運行時窗口的位置		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();		Dimension frameSize = frame.getSize();		if (frameSize.height > screenSize.height) {			frameSize.height = screenSize.height;		}		if (frameSize.width > screenSize.width) {			frameSize.width = screenSize.width;		}		frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);		frame.setVisible(true);	}	public static void main(String[] args) {		//設置運行風格		try {			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());		}		catch(Exception e) {			e.printStackTrace();		}		new StuMS();	}}