Inheritance and polymorphism - Exam questions tests - Sun Certified Java Programmer 310-065 - Lesson 63

Title: Inheritance and polymorphism - Exam questions tests - Sun Certified Java Programmer 310-065 - Lesson 63

Duration:  16 minutes

Summary: In this video, we start the second set of 75 questions for the 310-065 exam. Since the questions are generated randomly, the first question is number 48. This question deals with inheritance and polymorphism. The main concept is that you have an object of type parent that is pointing to a child. Some of the methods called are static. Others are not. The main idea to concentrate on is that polymorphism applies only to instance methods, not the static ones. The second question deals with string concatenation. We need to remember that String class is immutable and when calling methods like concat(), the result need to be stored in another string object.  The third question has to do with deciding which exceptions are being thrown by the developer and which ones are being thrown by the JVM. For these types of questions, you need to be familiar with the API and the exception classes available. Finally, the last question has to do with try/catch/finally block and threads.

Methodology of the development of example: Good coding standard and simplified design to prepare for the Java programmer certification exam CX-310-065.

Technology Used: Java – Core Concepts.

Keywords: class, object, extends, static, String, try, catch, finally, Thread, synchronized.