bit manipulation - abs function for float value in java -

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I need to create a function abs for the float with a beta operator, this function return float value.

I & lt; or & gt; can not be used.

I try this 

  (float) ((int) f ^ ((int) f> 31)) - ((int) f & gt; ;> 31)

but for -2.5 get value I 2.0 , this is not correct.

Can you help me?

you can do this 

  float bf = float. BitToFlot (float.floatioidbits (x) and 0x7FFFFFFF);

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