It’s much easier to format an int with printf than a float or double, because decimal precision is not a concern. Use %d as the placeholder specifier. Precede the letter d with a comma to add a ...

Java’s equals ... ("Should not compare with equals method because " + "the id is different, that means the objects are not equals for sure."); } } static class Simpson { int id; String name ...

The precision of a double in Java is 10-324 decimal places, although true mathematical precision can suffer due to issues with binary arithmetic. To simplify display, you can use %d printf notation to ...