Determining class with a Java instanceOf example - 032

What if we need to know the specific class for an instance in our list? In this lesson we're going to take a quick look at how we can determine the class of an instance.

Concepts: Java, Programming, instanceof, class, instance

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[robwm]

Would you be able to explain how this snippet works? I don't quite understand how this works and I have learned a lot from your teaching style.

public class TestClass {

public static void main(String[] args) {
B b = new C();
A a = b;
if(a instanceof A) System.out.println("A");
if(a instanceof B) System.out.println("B");
if(a instanceof C) System.out.println("C");
if(a instanceof D) System.out.println("D");
}
}
class A {}
class B extends A {}
class C extends B {}
class D extends C {}