oracle - Java double data type should never be used for precise values, such as currency? -

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this question has answer here:

when review official oracle java tutorial variables datatypes
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html

i surprised when read that
java double data type should never used precise values, such currency !

can 1 why?
, best practice used precise values, such currency?

best data type amount fields bigdecimal. joshua bloch explains in article in effective java why should used accurate precision.


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