Summary

Make ICC_Profile API classes sealed or final to indicate application subclassing is not possible.

Problem

It is not possible for applications to sub-class ICC_Profile classes since they have no public or protected constructors. This could be made more clear by using sealed and final modifiers

Solution

Apply the sealed modifier to the ICC_Profile class listing its only extant subclasses and mark those subclasses final.

Specification

java.awt.color.ICC_Profile

-public class ICC_Profile implements Serializable 
+public sealed class ICC_Profile implements Serializable
+    permits ICC_ProfileGray,
+            ICC_ProfileRGB 

java.awt.color.ICC_ProfileGray

-public class ICC_ProfileGray extends ICC_Profile 
+public final class ICC_ProfileGray extends ICC_Profile 

java.awt.color.ICC_ProfileRGB

-public class ICC_ProfileRGB extends ICC_Profile 
+public final class ICC_ProfileRGB extends ICC_Profile