Java Math unexpected trailing decimal

Question

Currently learning Java, can anyone explain why the following code yields this output?

System.out.println(330*1.1);

363.00000000000006

When it should simply equal 363. Why is there the trailing decimal?

Alternatively, the following code correctly outputs 363.0 yet is mathematically equivalent.

double check = 330; 
check = check + check*0.1; 
System.out.println(check);