My project use Hibernate.

The problem is , the filed in database is numeric(18,2). but the java basic type float only expression the numeric with 4byte.

if a var "float 123456.78" it will be print as "123456.8",;

that's not sitable for my Project, i need a little more excatly reulst,

can you tell me how can i do , without using java.lang.Double.

Thank you!!

I hate to tell you that this is'nt possible with double or float either. You'll have to use BigDecimal to get the precision you want.
BigDecimal will do BCD-Arithmetic versus normal float arithmetic in the case of double or float.

ciao
Sven