By using the Java Reflection API, we can examine the details of a class—an object's class name, modifiers, constructors, methods, fields, implemented interfaces, and so on.

Let's assume that we have the following Pair class:

public final class Pair<L, R> extends Tuple implements Comparable {

  final L left;
  final R right;

  public Pair(L left, R right) {
    this.left = left;
    this.right = right;
  }

  public class Entry<L, R> {}
    ...
}

Let's also assume that we have an instance of it:

Pair pair = new Pair(1, 1);

Now, let's use reflection to get the name of the Pair class.