如何在 Java 中为 Swing 组件设置不同的外观和感觉?
awtjavaobject oriented programmingprogrammingswing
Java Swing 允许我们通过更改外观和感觉 (L&F) 来自定义 GUI。外观定义组件的总体外观，感觉定义其行为。L&F 是 LookAndFeel 类的子类，每个 L&F 都由其完全限定类名标识。默认情况下，L&F 设置为 Swing L&F (Metal L&F)
要以编程方式设置 L&F，我们可以调用 UIManager 类的方法 setLookAndFeel () 。在实例化任何 Java Swing 类之前，必须调用 setLookAndFeel，否则将加载默认的 Swing L&F。
语法
public static void setLookAndFeel(LookAndFeel newLookAndFeel) throws UnsupportedLookAndFeelException
示例
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class LookAndFeelTest extends JFrame implements ActionListener {
private JRadioButton windows, metal, motif, ;
private ButtonGroup bg;
public LookAndFeelTest() {
setTitle("Look And Feels");
windows = new JRadioButton("Windows");
windows.addActionListener(this);
metal = new JRadioButton("Metal");
metal.addActionListener(this);
motif = new JRadioButton("Motif");
motif.addActionListener(this);
bg = new ButtonGroup();
bg.add(windows);
bg.add(metal);
bg.add(motif);
setLayout(new FlowLayout());
add(windows);
add(metal);
add(motif);
setSize(400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent ae) {
String LAF;
if(ae.getSource() == windows)
LAF = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
else if(ae.getSource() == metal)
LAF = "javax.swing.plaf.metal.MetalLookAndFeel";
else
LAF = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
try {
UIManager.setLookAndFeel(LAF);
SwingUtilities.updateComponentTreeUI(this);
} catch (Exception e) {
System.out.println("Error setting the LAF..." + e);
}
}
public static void main(String args[]) {
new LookAndFeelTest();
}
}
输出
