In the following example, the addition of 5.6 and 5.8 results in a value of 11.3999, not 11.4 For the most precise double calculations in Java, the JDK provides a special class named BigDecimal. For ...

It’s a good idea to use an abstract class when you need to implement mutable state. As an example, the Java Collections Framework includes the AbstractList class, which uses the state of variables.