CODEWITHSUNDEEP
java
satheesh
satheesh

Reputation: 1451

auto boxing and boxing of wrapper classes

in wrapper classes we have two types of methods parseXxx() and valueOf() in every wrapper class for interconversion between primitive and wrapper objects.recently java 1.5 introduced auto boxing and boxing.so why they didn't deprecate those methods.

Upvotes: 3

Views: 817

Answers (4)

Barbareek
Barbareek

Reputation: 52

As the command line arguments are treated as String Array, but given the condition when you are expecting command line argument other than String datatype(that may be primitives) i.e. boolean, int, byte, short, long, float, double, char than you need to parse the argument into the one what your program expects and here you use parseXXX() methods, to be precise parseXXX method take String argument and return the appropriate data type which you are trying to parse into.

Upvotes: 0

KarolDepka
KarolDepka

Reputation: 8628


1. There can be value sometimes in explicitly stating some conversion (for the clarity of e.g. some unobvious/obscure case).
2. Wouldn't that deprecation result in old programs becoming excessively littered with deprecation warnings?

Upvotes: 0

adarshr
adarshr

Reputation: 62593

Because Autoboxing and Auto Unboxing are just compile time features. Try writing something like this in your source file and then have a look at the decompiled code:

Integer i = 10;

Decompiled code:

Integer i = Integer.valueOf(10);

Similarly, 

int i = new Integer(100);

will give you the below when decompiled:

int i = (new Integer(100)).intValue();

Thus, the JVM still heavily relies on these methods at runtime, though it's masked when you write the code.

Upvotes: 6

Ernest Friedman-Hill
Ernest Friedman-Hill

Reputation: 81694

Well, parseXxx() is entirely unlike boxing; it turns a String into a primitive object. valueOf(), on the other hand, is actually used in boxing -- it either constructs a new wrapper object, or it fetches an existing one from a cache, depending on the value. The Java compiler generates a call to valueOf(), and that's precisely what boxing means.

Upvotes: 2

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