# Public API and Backwards Incompatible Changes in Aspose.Slides for Java 15.11.0

> Review public API updates and breaking changes in Aspose.Slides for Java to smoothly migrate your PowerPoint PPT, PPTX and ODP presentation solutions.

Source: https://docs.aspose.com/slides/java/public-api-and-backwards-incompatible-changes-in-aspose-slides-for-java-15-11-0/
Updated: 2026-08-05


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This page lists all [added](/slides/java/public-api-and-backwards-incompatible-changes-in-aspose-slides-for-java-15-11-0/) or [removed](/slides/java/public-api-and-backwards-incompatible-changes-in-aspose-slides-for-java-15-11-0/) classes, methods, properties and so on, and other changes introduced with the Aspose.Slides for Java 15.11.0 API.

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## **Public API Changes**
#### **Obsolete methods in com.aspose.slides.DataLabelCollection class have been deleted**
Obsolete methods in com.aspose.slides.DataLabelCollection class have been deleted:

DataLabelCollection.getNumberFormat()
DataLabelCollection.setNumberFormat(String value)
DataLabelCollection.getLinkedSource()
DataLabelCollection.setLinkedSource(boolean value)
DataLabelCollection.getDelete()
DataLabelCollection.setDelete(boolean value)
DataLabelCollection.getFormat()
DataLabelCollection.setFormat(Format value)
DataLabelCollection.getPosition()
DataLabelCollection.setPosition(int value)
DataLabelCollection.getSeparator()
DataLabelCollection.setSeparator(String value)
DataLabelCollection.getShowLegendKey()
DataLabelCollection.setShowLegendKey(boolean value)
DataLabelCollection.getShowLeaderLines()
DataLabelCollection.setShowLeaderLines(boolean value)
DataLabelCollection.getShowCategoryName()
DataLabelCollection.setShowCategoryName(boolean value)
DataLabelCollection.getShowValue()
DataLabelCollection.setShowValue(boolean value)
DataLabelCollection.getShowPercentage()
DataLabelCollection.setShowPercentage(boolean value)
DataLabelCollection.getShowSeriesName()
DataLabelCollection.setShowSeriesName(boolean value)
DataLabelCollection.getShowBubbleSize()
DataLabelCollection.setShowBubbleSize(boolean value)


#### **New methods getFirstSlideNumber() and setFirstSlideNumber() have been added to the Presentation class**
New methods getFirstSlideNumber() and setFirstSlideNumber() allow to get or to set the number of first slide in a presentation.
When a new first slide number value is specified all slide numbers are recalculated.

``` java
import com.aspose.slides.*;

Presentation pres = new Presentation("presentation.pptx");
try {
    int firstSlideNumber = pres.getFirstSlideNumber();

    pres.setFirstSlideNumber(10);

    pres.save("presentation_out.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}
```