### Question:
StandardXYBarPainter implements XYBarPainter, Serializable { @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof StandardXYBarPainter)) { return false; } return true; } StandardXYBarPainter(); @Override void paintBar(Graphics2D g2, XYBarRenderer renderer, int row,
            int column, RectangularShape bar, RectangleEdge base); @Override void paintBarShadow(Graphics2D g2, XYBarRenderer renderer, int row,
            int column, RectangularShape bar, RectangleEdge base,
            boolean pegShadow); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void testEquals() { StandardXYBarPainter p1 = new StandardXYBarPainter(); StandardXYBarPainter p2 = new StandardXYBarPainter(); assertEquals(p1, p2); }