What are the three most common approaches for creating wrapper objects

[Sandra Bachan]

Sierra/Bates, Chapter 3:

For the exam you need to understand the three most common approaches for creating wrapper objects..

However the text only brings up:

primitive xxxValue() - to convert a Wrapper to a primitive

primitive parseXxx(String) - to convert a String to a primitive

Wrapper valueOf(String) - to convert a String to a Wrapper

How does xxxValue() and parseXxx() create a wrapper object? It seems that create a primitive from a Wrapper or String, respectively.

I cannot find anywhere in the book that explicity lists the "three most common approaches for creating wrapper objects"

Also searched google and bing. Please help.

[Seetharaman Venkatasamy]

Sandra Bachan wrote:
How does xxxValue() and parseXxx() create a wrapper object? .

It wont.

[Piotr Nowicki]

In my opinion, if you will know the valueOf() along with the most obvious:

int v = 0;
Integer i = new Integer(v);

and perhaps explicit and implicit autoboxing

Integer i = (Integer)5;
Boolean b = (Boolean)true;
Integer i2 = 5;
Boolean b2 = true;

you should be fine for the exam :-)

Cheers!

Edit: thanks Wouter :-)

[Wouter Oet]

You're not casting in your example. You're using auto-boxing. A primitive can't be casted because it is not a reference.