学步园

java程序的界面编程详解

在Java中可以为程序自定义程序界面选择Windows、Unix、Java或Macintosh外观。甚至可以在程序运行时让用户自由的选择外观。

UIManager和SwingUtilities类

UIManager类保留了当前外观的信息，而SwingUtilities提供了几种实用的方法，尤其是UIManager类提供的静态方法setLookAndFeel。

一般的“界面”类如下：

javax.swing.plaf.metal.MetalLookAndFeel；

com.sun.java.swing.plaf.windows.WindowsLookAndFeel；

com.sun.java.swing.plaf.motif.MotifLookAndFeel;

可以来创建以下界面：

1：Java界面

2：Unix界面

3：与操作系统和谐的界面

4：跨平台的界面

定义Java的界面：

try

{

      String style = "javax.swing.plaf.metal.MetalLookAndFeel";

      UIManager.setLookAndFeel(style);

}

catch (Exception e)

{

      System.err.println("Exception: " + e);

}

定义与Unix界面：

try

{

      String style = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";

      UIManager.setLookAndFeel(style);

}

catch (Exception e)

{

      System.err.println("Exception: " + e);

}

定义与操作系统和谐的界面：

try

{

      String style = UIManager.getSystemLookAndFeelClassName();

      UIManager.setLookAndFeel(style);

}

catch (Exception e)

{

      System.err.println("Exception: "  + e);

}

定义类似跨平台的界面：

try

{

      String style = UIManager.getCrossPlatformLookAndFeelClassName();

      UIManager.setLookAndFeel(style);

}

catch (Exception e)

{

      System.err.println("Exception: " + e);

}

下面是一段完整的换界面的代码：

package WindowStyle;</p> <p>import javax.swing.*;<br /> import java.awt.FlowLayout;<br /> import java.awt.Container;<br /> import java.awt.event.*;</p> <p>public class windowstyle extends JFrame implements ActionListener<br /> {<br /> private JButton windLook = new JButton("Windows");<br /> private JButton unixLook = new JButton("Unix");<br /> private JButton javaLook = new JButton("Java");<br /> private JLabel label= new JLabel("FlySky Young");</p> <p> private class WindowCloser extends WindowAdapter<br /> {<br /> public void windowClosing(WindowEvent we)<br /> {<br /> System.exit(0);<br /> }<br /> }</p> <p> public windowstyle()<br /> {<br /> super("JFrame with Buttons");<br /> Container content = getContentPane();<br /> content.setLayout(new FlowLayout());<br /> content.add(label);<br /> content.add(windLook);<br /> content.add(unixLook);<br /> content.add(javaLook);</p> <p> //添加按钮监听事件<br /> windLook.addActionListener(this);<br /> unixLook.addActionListener(this);<br /> javaLook.addActionListener(this);</p> <p> validate();<br /> pack();<br /> setVisible(true);<br /> }</p> <p> public void actionPerformed(ActionEvent ae)<br /> {<br /> String style = "javax.swing.plaf.metal.MetalLookAndFeel";</p> <p> if (ae.getSource() == windLook)<br /> {<br /> style = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";<br /> }<br /> else if (ae.getSource() == unixLook)<br /> {<br /> style = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";<br /> }</p> <p> try<br /> {<br /> UIManager.setLookAndFeel(style);<br /> SwingUtilities.updateComponentTreeUI(this);<br /> pack();<br /> }<br /> catch (Exception e)<br /> {<br /> System.err.println("Exception: " + e);<br /> }<br /> } </p> <p> public static void main(String args[])<br /> {<br /> windowstyle style = new windowstyle();<br /> }<br /> }<br />