2009/8/19 zhaoyi <[email protected]>
>
> Sorry, the code is:
>
> import javax.swing.JPanel;
>
> import com.google.inject.AbstractModule;
> import com.google.inject.Guice;
> import com.google.inject.Inject;
> import com.google.inject.Injector;
> import com.google.inject.name.Named;
> import com.google.inject.name.Names;
>
> public class AnnotationDemo3 {
> @Inject
> @Named("panel")
> public JPanel panel=null;
>
> public AnnotationDemo3(){
> System.out.println(panel);
> }
>
> public JPanel getPanel() {
> return panel;
> }
>
> public void setPanel(JPanel panel) {
> this.panel = panel;
> }
>
> public static void main(String[] args) {
> Injector injector = Guice.createInjector(new
> AbstractModule() {
> @Override
> protected void configure() {
>
> bind(JPanel.class).annotatedWith(Names.named("panel")).to(
> MyPanel.class);
> }
> });
> AnnotationDemo3 demo3 =
> injector.getInstance(AnnotationDemo3.class);
> System.out.println(demo3.panel);
> }
> }
>
>
> class MyPanel extends JPanel {
>
> }
>
FYI, constructor injection goes something like this...
public class AnnotationDemo3 {
private JPanel panel;
@Inject
public AnnotationDemo3(@Named("panel") JPanel panel) {
this.panel = panel;
System.out.println(panel);
}
// etc...
> On Aug 19, 7:00 am, Stuart McCulloch <[email protected]> wrote:
> > 2009/8/19 zhaoyi <[email protected]>
> >
> >
> >
> > > Below is my code. The class AnnotationDemo3 has a panel field which
> > > will be injected by annotation. The output of this program is:
> >
> > > null
> > > demo.bindinganontation.MyPanel[,
> >
> > >
> 0,0,0x0,invalid,layout=java.awt.FlowLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=]
> >
> > > In the constructor, the printf will print a null value which means the
> > > panel field doesn't have been created at this time. How can I let it
> > > creates the field at the very beginning time of the create created.
> >
> > I don't see any code here, but it sounds like you need to use constructor
> > injection:
> >
> > http://code.google.com/p/google-guice/wiki/Injections
> >
> > thanks.
> >
>
--
Cheers, Stuart
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