We will focus on the relationship between polymorphism and Java inheritance. The main thing to keep in mind is that polymorphism requires an inheritance or an interface implementation. You can see ...

The listing below demonstrates this scenario. import java.util.ArrayList; class EnclosingClass { private int[] data; public EnclosingClass(int size) { data = new int[size]; } class EnclosedClass ...

If a developer has a set of int values they want to store in an ArrayList, it can’t be done. Unless, of course, they use a corresponding wrapper class or take advantage the autoboxing in Java feature.

If you need to call wait(), notify(), or notifyAll() from within a non-synchronized method, then you must first obtain a lock on the object's monitor. If you don't, an exception will be generated ...