Why the object wrapper for an int is Integer and not Int?

Question

I've seen that whe have the following mapping between primitive and object version of a variabile:

• float -> Float
• double -> Double
• boolean -> Boolean
• byte -> Byte
• short -> Short
• ...

So, for all of them the only difference is the first letter of the world. I would like to know why this rule does not apply for int that becomes Integer (and not Int) and for char that becomes Character and not (Char).

I don't know if this is the right place to ask this question but I would really like to know if there is a reason for this choice, even because I teach java to kids and often they ask the same question to me.

Answer 1

Because JDK classes honor the Java naming convention.

Class names should be nouns, in mixed case with the first letter of each internal word capitalized. (...) Use whole words-avoid acronyms and abbreviations (unless the abbreviation is much more widely used than the long form, such as URL or HTML).

Reference:

Java naming conventions