You either have to know the type in advance via some other means, or use reflection to get it. <BR><BR>However, to do this you don't need to know the type of objects within the ArrayList at all.

Developers use variables in Java to hold data, with all variables having a data type and a name. The data type determines the values that a variable can hold. In this tutorial, you’ll learn how ...

Remember that in Java, for a reference variable of some type referring an object of its supertype is forbidden: arrows in Figure 8 must not be directed upwards.

Object-oriented systems are usually partitioned into layers of related responsibilities and only dependencies in one direction are allowed, from higher layers (more specific, less reusable) to lower ...

Constructors play a key role in all object-oriented programming languages, and Java is no exception. Every class a Java developer creates needs a constructor. Constructors perform numerous important ...