This helps you avoid runtime errors like the ClassCastException, which happens when you try to cast objects to incompatible types ... is to help Java developers use better programming practices ...

Class definition: NumericOperations is a simple Java class containing a static method square. Generic method: square is a static method defined with a generic type T that is bounded by the Number ...

With a Java lambda expression, the object type isn’t required ... lambda expression runs, the program prints out 25. That’s all you really need to know about the java.util.function.Function interface.