我有一个问题,我从这两行中得到一个错误
System.out.println(tw.getX());
System.out.println(tw.getY());
因为
tw
的范围是错误的。如何正确设置?package misc;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import static java.awt.GraphicsDevice.WindowTranslucency.*;
public class TranslucentJframe extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private JButton button;
public TranslucentJframe() {
super("Frame");
setLayout(new GridBagLayout());
setSize(485,860);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button = new JButton("Frame is set!");
button.addActionListener(new SetFrame());
this.getContentPane().add(button);
}
public class SetFrame implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.out.println(tw.getX());
System.out.println(tw.getY());
}
}
public static void main(String[] args) {
// Determine if the GraphicsDevice supports translucency.
GraphicsEnvironment ge =
GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
//If translucent windows aren't supported, exit.
if (!gd.isWindowTranslucencySupported(TRANSLUCENT)) {
System.err.println(
"Translucency is not supported");
System.exit(0);
}
JFrame.setDefaultLookAndFeelDecorated(true);
// Create the GUI on the event-dispatching thread
SwingUtilities.invokeLater(new Runnable() {
public void run() {
TranslucentJframe tw = new TranslucentJframe();
// Set the window to 55% opaque (45% translucent).
tw.setOpacity(0.55f);
// Display the window.
tw.setVisible(true);
}
});
}
}
最佳答案
您需要将TranslucentJframe
传递给SetFrame
侦听器。
更改button.addActionListener(new SetFrame());
对此button.addActionListener(new SetFrame(this));
然后在SetFrame
中定义字段:
public class SetFrame implements ActionListener {
private TranslucentJframe tw;
public SetFrame(TranslucentJframe tw) {
this.tw = tw;
}
public void actionPerformed(ActionEvent e) {
System.out.println(tw.getX());
System.out.println(tw.getY());
}
}