Is there no 'bit' data type in Java?

i want to write a private protol in java , but there is no 'bit' data type, it is difficult to communicate data frame to other application which wrote in c++.
can any friend give me a hand?
thanks.
:)

In Java there are no bit fields.
Also you can not directly map an external data layout to an internal representation, that is, there is no "struct" which you could read directly from a file.
You can read your int's or bytes's and do some computations with them.

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RTFM
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see
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java.util.Calendar
GregorianCalendar
SimpleDateFormat
System.currentTimeMillis()

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Unsigned data types in Java

I know this is beating an old dead horse, but I find it frustrating that Java does not support unsigned types. I frequently work with binary file formats that store data in unsigned types. In Java there is no easy way to work with these files. For example, if the file has unsigned longs it is a problem. Also, if the file has unsigned ints, a very common occurrence, I have to "upcast" those numbers into longs. This is expensive from a time and space point of view since data files from satellites can be hundreds of megabytes or gigabytes in size and I have to double them in size just to capture the final bit. It is also inefficient to process these files because now I am using longs (64-bits) on systems that are usually optimized for 32-bits which means processing code takes a big performance hit.
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JohnChamberlain wrote:
I thought it was obvious that you need to upconvert unsigned values because otherwise the number will be wrong if the sign bit is set.No. A 32-bit scalar with the high bit set is still correct (bit-for-bit). You only get problems if you perform arithmetic, right-shift or widening-conversion on it, or make a decimal String representation.
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Maybe it wasn't clear that I need to not only load the values but use them.You did fail to mention that.
The files I load get passed on to other applications where the values get used and obviously that includes doing calculations on them so the values have to be correct. I cannot load a bunch of UInt32s into Java ints and say "pretend they are positive numbers".I get the impression you are not really interested in finding solution.
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report Test .
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Hello,
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I have to synchronize unidirectionally from the Oracle database to DB2. And I'd like to save the information of the record of DB2 prior to the update operation.
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ghs wrote:
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Keep in mind that these are guesses.
3) What I really want to know is this: If I use wrapper classes of Short and Byte (instead of Integer), what will be the harmful consequences (IF ANY)? So far, I have done some trivial testing with a Short for a SMALLINT column (I have not yet tried any TINYINT columns), and it seems to be working.I considered it risky to not test all target databases and drivers.
Obviously testing will reveal problems.
If you don't want to test then you might want to stick with integers.

Java Data Types?

Hi,
shall we say
The data types in Java 1.5 can be divided into 4 categories. They are:
i.     Primitive Data Types
ii.     Abstract Data Types
iii.     Arrays
iv.     Enumerated Data Types
...............?

Raijinsetsu wrote:
I have to agree with jverd...
Abstract is not a data type. Abstract declares a specific type of class which cannot be instantiated. Enumerations are just specialized objects. Arrays are also specialized objects.One could choose to consider arrays, enums, and abstract classes as separate categories.
>
If you wanted, the full list would be:
Object (reference is another term you could apply to objects)
int
long
short
byte
charEven if you include the primitives you forgot, this list is just as arbitrary as the original one, and does not correspond to the JLS.
In particular, Object is not a type. There are primitives, references, and the null type.
Edited by: jverd on May 6, 2009 7:56 AM

Is there no 'bit' data type in Java?

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