java - Why are these different numbers the same? -

i'm doing unit testing , i've got line:

assertequals(1.1886027926838422606868849265505866347, 1.18860279268384230000000000000000000000,0);

with delta of 0 should have same in order pass , not, test passes, try yourself.

changing delta 1e-50 still passes.

why passing when 2 different numbers?

this because java compiler rounds these 2 numeric literals same number.

run experiment:

system.out.println(1.1886027926838422606868849265505866347); system.out.println(1.18860279268384230000000000000000000000);

this prints same number (demo):

1.1886027926838423 1.1886027926838423

the double primitive type can handle 16 decimal places, cannot represent these numbers way last digit.

if want full precision, use bigdecimal instead.

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