Shift operations with float and double

[Kujtim Hyseni]

Hello, I need to know hot to use shift operators << and >> in Java with float and double types. I tried to use them but I got compile error. I needed it for serialization data e.g. sending over the streams.

[Lost User]

I do not think that Java streams allow these operators, << and >> are shift operators which is why you get compile errors.

I must get a clever new signature for 2011.

[Lost User]

Both Double and Float support the longValue() method which will return you a long primitive (if it's in the range of long). The other option for bit manipulation is to use the toHexString() method on Double or Float.

[David Skelly]

This may be a dumb question but what does bit shifting have to do with serialization? Why would you need to shift the bits in a double value in order to send it over a stream?

[Lost User]

I think the OP is getting confused with the stream operators of C++.

I must get a clever new signature for 2011.

[TorstenH]

see this: Bit Operations Tutorial @ oracle.com[^] regards Torsten

I never finish anyth...

[parths]

I'm assuming that you want to use the bit-representation of the floating point value with the shift operators to create a float from a byte-stream, and vice-versa The java Float class (here[^]) contains functions: floatToIntBits, floatToRawIntBits -- Convert from a float to an integer containing the float value's bit representation intBitsToFloat: Converts an integer value (containing a float value's bit representation) to a Float variable. So basically you can do something like:

byte[] data = ...;
int rdInt = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24); // Or the other way round depending on endian-ness.
float rdFloat = Float.intBitsToFloat(rdInt);

... And do the opposite to convert back from float to bytes.

"It was when I found out I could make mistakes that I knew I was on to something." -Ornette Coleman "Philosophy is a study that lets us be unhappy more intelligently." -Anon.