java中aboutBox()的问题



我正在Netbeans 6.9中开发一个javadesktop应用程序,一切都很完美,但。。。它给了我一个错误:

@Action
public void showAboutBox()
{
     if (aboutBox == null) {
        JFrame mainFrame = Mp4App.getApplication().getMainFrame();
        aboutBox = new mp4AboutBox(mainFrame);
        aboutBox.setLocationRelativeTo(mainFrame);
    }
}
/** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")

这就是错误:

Compiling 1 source file to Q:Mp3 Appmp4-betamp4buildclasses
Q:Mp3 Appmp4-betamp4srcmp4Mp4View.java:223: cannot find symbol
symbol  : class mp4AboutBox
location: class mp4.Mp4View
        aboutBox = new mp4AboutBox(mainFrame);
1 error
Q:Mp3 Appmp4-betamp4nbprojectbuild-impl.xml:603: 
The following error occurred while executing this line:
Q:Mp3 Appmp4-betamp4nbprojectbuild-impl.xml:284: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 8 seconds)

真正的问题是,这是从netbeans生成的代码。。。此外,如果您创建了一个新的Project->java->Destop应用程序,并且将其保留在那里而不添加任何内容,那么它总是会给我带来同样的问题。。。该怎么办????????????

netbeans版本:6.9.1jdk版本:7O.S:Windows 7 32位

您不应该使用Netbeans创建GUI,因为它会生成不可读的代码。Swing-包是非常直接的,所以你应该使用它

对于错误:你有mp4AboutBox-类吗?它里面有什么?

您可能缺少导入。在该文件中提供您的导入。

我遇到了一个类似的问题,我通过重新安装netbeans 6.9.1得到了解决方案。

这就是我从中得出的解决方案:

测试项目类别:

import org.jdesktop.application.Application;
import org.jdesktop.application.SingleFrameApplication;
public class TestProject extends SingleFrameApplication {
    @Override protected void startup() {
        show(new AppView(this));
    }
    @Override protected void configureWindow(java.awt.Window root) { }
    public static TestProject getApplication() {
        return Application.getInstance(TestProject.class);
    }
    public static void main(String[] args) {
        launch(TestProject.class, args);
    }
}

AppView JFrame:

import org.jdesktop.application.FrameView;
import org.jdesktop.application.SingleFrameApplication;
public class AppView extends FrameView {
   public AppView(SingleFrameApplication app) {
       super(app);
       JFrame mainFrame = TestProject.getApplication().getMainFrame();
       AboutBox newAboutBox = new  AboutBox();
       newAboutBox.setLocationRelativeTo(mainFrame);
       TestProject.getApplication().show(newAboutBox);
   }
}

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