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19#
发表于 2008-7-16 12:29:52
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只看该作者
来自：北京
import javax.swing.*;
import java.awt.*;
public class OpaqueExample extends JFrame {
public OpaqueExample( ) {
super("Opaque JPanel Demo");
setSize(400, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// Create two JPanels (opaque), one containing another opaque JPanel and the
// other containing a nonopaque JPanel.
JPanel opaque = createNested(true);
JPanel notOpaque = createNested(false);
// Throw it all together.
getContentPane( ).setLayout(new FlowLayout( ));
getContentPane( ).add(opaque);
getContentPane( ).add(notOpaque);
}
public static void main(String[] args) {
OpaqueExample oe = new OpaqueExample( );
oe.setVisible(true);
}
// Create a JPanel containing another JPanel. The inner JPanel's opacity is set
// according to the parameter. A JButton is placed inside the inner JPanel to give
// it some content.
public JPanel createNested(boolean opaque) {
JPanel outer = new JPanel(new FlowLayout( ));
JPanel inner = new JPanel(new FlowLayout( ));
outer.setBackground(Color.white);
inner.setBackground(Color.black);
inner.setOpaque(opaque);
inner.setBorder(BorderFactory.createLineBorder(Color.gray));
inner.add(new JButton("Button"));
outer.add(inner);
return outer;
}
} |
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