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Easy Learn Java: Programming Articles, Examples and Tips - Page 13


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Question: Java has no sizeof() like C++... Why?

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Question: Java has no sizeof() like C++... Why?

Answer: In C and C++ the sizeof() tells the number of allocated bytes for data items. Different machines and OSs can allocate different number of bytes for the same data. For example integer can be stored in 16 or 32 bits.
That's why important to know for programmer this information.
Java is much better in this situation since it keeps the same size on all machines.
The portability is a part of language and you should not worry about this - just know it!
--
Sasha
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Our older tips: March 22, 2001 - Oktober 21, 2002 read here.
All published and not published on site tips you can find here


655 bytes more | 20 comments | Printer Friendly Page  Send to a Friend | Score: 4.5
Posted by jalex on Tuesday, January 28, 2003 (00:00:00) (5027 reads)

Question: Can anyone tell me why the Java Vector class is called a ''Vector''?

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Question: Can anyone tell me why the Java Vector class is called a "Vector"?
I come from the engineering world, so I am trying to make some sense out of the name.

Answer: "Vector" is a common name for an array of one dimension. I think that it was designed to be accessed in only one direction - from start to end. Of course, you can write code to iterate backwards...

But the enumeration it goes you don't have a getPrev() method, only a getNext():

for (Enumeration e = v.elements() ; e.hasMoreElements() Wink {
System.out.println(e.nextElement());
}

So a Vector has dimension (number of elements) and direction (in terms of access). Are you agree?
******************************************************************
Our older tips: March 22, 2001 - Oktober 21, 2002 read here.
All published and not published on site tips you can find here


700 bytes more | 13 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Monday, January 27, 2003 (00:00:00) (5325 reads)

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