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I have been learning about object-orientated programming for the past few days. I am not sure why instance variables are declared private, so could someone explain the purpose? Thank you.

Thanks!

Done.

So this application gets input from the user and converts it into a string. It then uses various methods to set instance variables of this class and ends up printing those classes to display...

So would you agree that an object's identity is it's reference value to the reference value to its state or value such as a String's text?

"All object variables are reference types, which mean they don't actually contain the data like primitive data types do. Instead, they point to the data, which is another an other area of internal...

It is from a book called murach's Java Programming.

I am not sure if an object's identity is it's location in the internal memory or a reference value that points towards its state.
Could someone please explain what it actually is?

I am simply confused on how to convert the equation below for bigDecimal objects. I have already tried this, and this and the output is really weird once I call the method.
The first block of code...