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Easy Learn Java: Programming Articles, Examples and Tips - Page 23


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Q: Why in the write method for the OutputStream class we have "int b"?

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Question: Why in the write method for the OutputStream class we have "int b"? Was not it possible to have public abstract void write(byte b)?

I am confused: In javadoc for public abstract class OutputStream:

"public abstract void write(int b) throws IOExceptionWrites the specified byte to this output stream."

In the same description later: "The 24 high-order bits of b are ignored" ...? Why do we need to use int and ignore 3/4 of that afterwards...

Has it relation to memory management efficiency on 32-bits CPUs and OSs?

What's about 64-bit CPUs like Itanium... Will SUN change int to 64-bits size?

Or does SUN believe that in future bytes will be 32 bits long? Smile


Answer: Equivalent method read() returns an int also. This is to enable a return value of -1 in which is not possible if use byte.

Byte is signed and it has the value range: -128 to 127. And even if the sign is not so important there will not be any possibility to distinguish between -1 and 255!

And last point: byte can not be used directly for mathematical operations, it has to be converted to int anyway.


526 bytes more | 25 comments | Printer Friendly Page  Send to a Friend | Score: 4
Posted by jalex on Friday, February 21, 2003 (00:00:00) (4272 reads)

Q: How can I make my Java package name unique?

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Q: How can I make my Java package name unique?

Answer: By convention, the first part of the package name is the Internet domain name of the class creator, reversed.

Since the Internet domain names are unigue you should follow this agreement. Do not use the package name that already match some domain name that you are not owner of. Find free name and register it. You can find cheap registration now on Internet, ~$10/year!



29 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Thursday, February 20, 2003 (00:00:00) (5491 reads)

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