// Metal风格 (默认)
        String lookAndFeel = "javax.swing.plaf.metal.MetalLookAndFeel";
        UIManager.setLookAndFee(lookAndFeel);
// Windows风格
        String lookAndFeel = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
        UIManager.setLookAndFee(lookAndFeel);  

// Windows Classic风格
        String lookAndFeel = "com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel";
        UIManager.setLookAndFee(lookAndFeel);  

// Motif风格
        String lookAndFeel = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
        UIManager.setLookAndFeel(lookAndFeel);

// Mac风格 (需要在相关的操作系统上方可实现)
        String lookAndFeel = "com.sun.java.swing.plaf.mac.MacLookAndFeel";
        UIManager.setLookAndFeel(lookAndFeel);

// GTK风格 (需要在相关的操作系统上方可实现)
        String lookAndFeel = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
        UIManager.setLookAndFeel(lookAndFeel);

// 可跨平台的默认风格
        String lookAndFeel = UIManager.getCrossPlatformLookAndFeelClassName();
        UIManager.setLookAndFeel(lookAndFeel);

// 当前系统的风格
        String lookAndFeel = UIManager.getSystemLookAndFeelClassName();
        UIManager.setLookAndFeel(lookAndFeel);

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