system.out.println output for decimal numbers

Question

I am trying to understand below output

System.out.println(4.0-3.2);

output is 0.7999999999999998

while it was expected to be 0.8

on the other hand

System.out.println(4.0+3.2);

is 7.2

System.out.println(2.0*0.2);

returns 0.4 why is so long value in case of System.out.println(4.0-3.2);

Can you please explain?