### Question:
StackedBarRenderer3D extends BarRenderer3D implements Cloneable, PublicCloneable, Serializable { @Override public int hashCode() { int hash = super.hashCode(); hash = HashUtilities.hashCode(hash, this.renderAsPercentages); hash = HashUtilities.hashCode(hash, this.ignoreZeroValues); return hash; } StackedBarRenderer3D();  StackedBarRenderer3D(double xOffset, double yOffset);  StackedBarRenderer3D(boolean renderAsPercentages);  StackedBarRenderer3D(double xOffset, double yOffset,
            boolean renderAsPercentages); boolean getRenderAsPercentages(); void setRenderAsPercentages(boolean asPercentages); boolean getIgnoreZeroValues(); void setIgnoreZeroValues(boolean ignore); @Override Range findRangeBounds(CategoryDataset dataset); @Override void drawItem(Graphics2D g2, CategoryItemRendererState state,
            Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis,
            ValueAxis rangeAxis, CategoryDataset dataset, int row, int column,
            int pass); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void testHashcode() { StackedBarRenderer3D r1 = new StackedBarRenderer3D(); StackedBarRenderer3D r2 = new StackedBarRenderer3D(); assertEquals(r1, r2); int h1 = r1.hashCode(); int h2 = r2.hashCode(); assertEquals(h1, h2); }