If another developer attempts to extend your parent class ... while making code more readable and easier to maintain. Here's how it works. Use sealed classes in Java to control your inheritance Need ...

Another key difference is that classes can implement more than ... Only functional interfaces can use the lambda feature in Java. Abstract classes with only one abstract method cannot use lambdas.

An enumerated type specifies a set of related constants as its values. Examples include the days in a week, the standard north/south/east/west compass directions, a currency’s coin denominations ...