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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