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converting hexa decimal into int

sanla palati
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Joined: Oct 17, 2007
Posts: 36
Hi ,


How to convert the hexadecimal value 0xbeef into int.
Sekhar Kadiyala
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Joined: Feb 17, 2004
Posts: 170
Are you looking for manual integer conversion or methods of wrapper classes?


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Kelvin Chenhao Lim
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Joined: Oct 20, 2007
Posts: 513
Integer.decode() should do the trick, though I believe this is outside the scope of the SCJP exam.


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Burkhard Hassel
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Joined: Aug 25, 2006
Posts: 1274
Howdy!

0xbeef is already an int, an int literal to be precise. Only it is not written in decimals but in hexadecimals.


int i = 0xbeef;
System.out.println(i);

prints out the value in decimals.


Yours,
Bu.


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sanla palati
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Joined: Oct 17, 2007
Posts: 36
Thanks for your replys guys.But Burkhard, how can i know that 0xbeef is an interger. I am confused.
Jesper de Jong
Java Cowboy
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Joined: Aug 16, 2005
Posts: 14266
    
  21

Hexadecimal is not a separate data type. It is just a way to write numbers - in the base-16 numeric system instead of base-10 (decimal). When an integer literal in Java code starts with "0x", then it's in hexadecimal.

In addition to hexadecimal, you can write numbers in octal (the base-8 number system). A number is interpreted as octal if it starts with "0".


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Burkhard Hassel
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Joined: Aug 25, 2006
Posts: 1274
Sanla asked

how can i know that 0xbeef is an interger


You're right, at a first glance 0xbeef looks more like something to eat than like an integer for many people.
Similarly, 0xCAFE looks more like something to drink than like the number 51966.

But you have to know about the other two ways of writing an integer.
Perhaps try this as a primer:



I'm terribly sorry that this output ends in a thirteen.
But hopefully you are not supersticious.
Ah, no, it doesn't end in a thirteen but in a nineteen!!!
Phew!

Yours,
Bu.
 
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