[A] mathematical model for data types where a data type is ... similar to how Java classes implement interfaces. Examples of ADTs include Employee, Vehicle, Array, and List. Consider the List ...

Generally speaking, we can say that array types are covariant in Java. We’ll look at examples of covariance ... class Generic<T> { T data; void write(T data) { this.data = data; ...

we will work through a Java Supplier interface example. Java’s functional supplier interface can be used any time a function needs to generate a result without any data passed into it. Now, contrast ...

Even the most complicated classes in Java can be flattened down to nothing more than the set of primitive data types they represent. But primitive types aren’t objects, and that presents a problem.