Java关于UI外观设置的帮助类UIHelper的几个方法

public class UIHelper {

// 设置窗口居中显示

public static void setCenter(Component comp) {

Toolkit toolkit = Toolkit.getDefaultToolkit();

Dimension screenSize = toolkit.getScreenSize();

int x = (screenSize.width - (int) comp.getPreferredSize().getWidth()) / 2;

int y = (screenSize.height - (int) comp.getPreferredSize().getHeight()) / 2;

comp.setLocation(x, y);

}

/*设置窗口最大化，窗口对象是JFrame*/

public static void setWinMax(JFrame frame)

{

frame.setExtendedState(javax.swing.JFrame.MAXIMIZED_BOTH);

}

/*设置窗口最大化,当窗口对象为JPanel*/

public static void setMaxSize(JPanel panel) {

GraphicsEnvironment graphicsEnvironment=GraphicsEnvironment.getLocalGraphicsEnvironment();

//get maximum window bounds

Rectangle maximumWindowBounds=graphicsEnvironment.getMaximumWindowBounds();

Dimension activeSize = new Dimension(maximumWindowBounds.width,maximumWindowBounds.height);

panel.setPreferredSize(activeSize);

}

/*校验界面输入值是否为空 */

public static boolean isEmpty(String inputValue){

if(inputValue ==null || "".equals(inputValue.trim()))

return true;

else

return false;

}

/*让java gui 界面使用前操作系统的界面风格，让java界面不再丑陋^_^*/

public static void setUILookAndFeel() {

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

} catch (ClassNotFoundException ex) {

Logger.getLogger(SysUtil.class.getName()).log(Level.SEVERE, null, ex);

} catch (InstantiationException ex) {

Logger.getLogger(SysUtil.class.getName()).log(Level.SEVERE, null, ex);

} catch (IllegalAccessException ex) {

Logger.getLogger(SysUtil.class.getName()).log(Level.SEVERE, null, ex);

} catch (UnsupportedLookAndFeelException ex) {

Logger.getLogger(SysUtil.class.getName()).log(Level.SEVERE, null, ex);

}

}

}

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