LookAndFeel可以改变图形界面的风格，比如说可以将Java的默认界面改变成仿Windows，UNIX等其它风格的界面，主要有以下几种界面风格：
metal(默认):
"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(需要相关系统):
"com.sun.java.swing.plaf.mac.MacLookAndFeel"
GTK(需要相关系统):
"com.sun.java.swing.plaf.gtk.GTKLookAndFeel"
也可以通过：UIManager.getSystemLookAndFeelClassName()获取当前系统风格UIManager.getCrossPlatformLookAndFeelClassName()获取可跨平台的默认风格
动态的改变界面风格，主要用到下面两个方法：
UIManager.setLookAndFeel(String str)设置当前外观为str所指定的
SwingUtilities.updateComponentTreeUI(Component c)重新初始化组件的外观
举个例子：
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);
}
});
}
}
效果图如下：
nimbus
unix
windows
