Color

Both are equally the same and can be used interchangeable. The lowercase names for the colors were first, which leads me to believe that they added the uppercase names later to conform with the standard convention of using all uppercase letters for constant values.

You can test this with:

Then why didn't they delete the old ones, now there's both? I tried it like that and it said "true", when I changed one of them to Color.black it said "false", which means it works but when I changed the ".equals" to '==' I got the same results. Why did you use the .equals if you could use '==', it's not a string but it's not an int or double either? (What will happen if I use '.equals()' for an int?)

It would break all programs that already written using 'white'. Color objects are not a primitive type. This should show 'false': However, this should show 'true': You cannot call a method on a primitive type. An 'int' value would need to be converted to an Integer object before any methods can be called on it.

Since primitive types cannot use the 'equals' method, the question refers only to object references. If you want to know if two objects are similar, use the 'equals' method. If you want to know if two object references refer to the same object, use '=='. Apparently 'Color.white' and 'Color.WHITE' both refer to the same instance of the Color class. The Object class 'equals' method must be overridden in a class for comparing objects of the class for similarity with the 'equals' method. If not, 'equals' performs the same as '=='. All this is explained in the middle section of this page of the java tutorials.

See the section called 'Instantiating a class' on this page of the java tutorials.

The word(s) 'instanceof' is mentioned 0 times on that page, I pressed Ctrl 'F' to "Find" and it said "0 of 0". (I did that after I looked through it.)

Sorry, try the bottom of this page.