LookAndFeel可以改變圖形界面的風格，比如說可以將Java的默認界面改變成仿Windows，UNIX等其它風格的界面，主要有以下幾種界面風格：

metal(默認):

"javax.swing.plaf.metal.MetalLookAndFeel"

windows:

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

nimbus:

"com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"

windows classic:

"com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel"

unix：

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

mac(需要相關系統):

"com.sun.java.swing.plaf.mac.MacLookAndFeel"

GTK(需要相關系統):

"com.sun.java.swing.plaf.gtk.GTKLookAndFeel"

也可以通過：UIManager.getSystemLookAndFeelClassName()獲取當前系統風格UIManager.getCrossPlatformLookAndFeelClassName()獲取可跨平臺的默認風格

動態的改變界面風格，主要用到下面兩個方法：

UIManager.setLookAndFeel(String str)設置當前外觀為str所指定的

SwingUtilities.updateComponentTreeUI(Component c)重新初始化組件的外觀

舉個例子：

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

public class LookAndFeel extends JFrame implements ActionListener{

private String str;

private JButton b1,b2,b3;

private JPanel panel;

LookAndFeel(){

panel = new JPanel();

panel.setLayout(new FlowLayout());

b1 = new JButton("windows");

b1.addActionListener(this);

b2 = new JButton("nimbus");

b2.addActionListener(this);

b3 = new JButton("uniux");

b3.addActionListener(this);

panel.add(b1);

panel.add(b2);

panel.add(b3);

this.add(panel);

this.setSize(400, 300);

}

public void actionPerformed(ActionEvent e) {

if(e.getSource()==b1){

str = "com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel";

}

else if(e.getSource()==b2){

str = "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel";

}

else if(e.getSource()==b3){

str = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";

}

try {

UIManager.setLookAndFeel(str);

SwingUtilities.updateComponentTreeUI(this);

} catch (Exception e1) {}

}

public static void main(String str){

SwingUtilities.invokeLater(new Runnable() {

public void run() {

LookAndFeel inst = new LookAndFeel();

inst.setLocationRelativeTo(null);

inst.setVisible(true);

}

});

}

}

效果圖如下：

nimbus

unix

windows

總結

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