修改下接口返回类型

designer_chart/src/com/fr/design/mainframe/chart/gui/type/AbstractChartTypePane.java

@@ -133,7 +133,7 @@ public abstract class AbstractChartTypePane extends FurtherBasicBeanPane<Chart>{
     }
 
     //子类覆盖
-    protected Plot getSelectedClonedPlot(){
+    protected <T extends Plot> T getSelectedClonedPlot(){
         return null;
     }