Java 如何在GWT中调用外部方法?
这是我的代码:Java 如何在GWT中调用外部方法?,java,gwt,flowlayoutpanel,Java,Gwt,Flowlayoutpanel,这是我的代码: final DialogBox menuWrapper = new DialogBox(true); MenuBar options = new MenuBar(true); menuWrapper.add(options); options.addItem("First", new ScheduledCommand() { FlowPanel flowpanel; .. flowpanel
final DialogBox menuWrapper = new DialogBox(true);
MenuBar options = new MenuBar(true);
menuWrapper.add(options);
options.addItem("First", new ScheduledCommand()
{
FlowPanel flowpanel;
..
flowpanel = new FlowPanel();
flowpanel.add(txtFirst);
..
ChartLoader chartLoader = new ChartLoader(ChartPackage.CORECHART);
chartLoader.loadApi(new Runnable() {
@Override
public void run() {
..
LineChart lineChart = new LineChart();
Datatable ..
lineChart.draw(dataTable);
panelChart.add(lineChart);
addPanel(panelChart);
}
private void addPanel(LayoutPanel panelChart) {
flowpanel.add(panelChart);
}
}
}
这条线
flowpanel.add(panelChart);
我有一个错误:
Cannot refer to a non-final variable flowpanel inside an inner class defined in a different method
我想把我所有的小部件都添加到PopupPanle上的flowPanel中,但我无法定义最终的方法,有解决这个问题的方法吗?谢谢。您需要在FlowPanel声明之前添加一个修饰符final:
final FlowPanel flowpanel = new FlowPanel();
或者,您可以将此FlowPanel设置为类变量:
private FlowPanel flowpanel;
...
// your class methods
当您在延迟或异步方法中引用对象时,编译器希望确保该对象不会在需要时被重新分配。Good第二个提示!谢谢