The class java.awt.geom.Area overrides equals with class name as a signature.
Hence it does not override Object equals properly (reference: "Effective Java" Item #7)

Note: This bug is flagged by a program that checks for programming
errors mentioned in "Effective Java" along with other checks.

The classes below needs to be considered as well:
       java.awt.DisplayMode
       java.awt.font.GlyphVector

The class below overrides equals() but not hashCode():
       java.awt.Font$FontLineMetrics