OCPJP Simulation Test 6

6

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Question List

Question: What is the output of the following program?

  1 public abstract class Message {
  2   private static String recipient = "";
  3   void sendMessage(){};
  4   public static void main(String args[]) {
  5     Message email = new XyzMessage();
  6     email.recipient = "John@xyznetwork.com";
  7     email.sendMessage();
  8   }
  9   static class XyzMessage extends Message {
 10     public final void sendMessage()  {
 11       System.out.println("Message is sent to " + recipient);
 12     }}}

Choice:
A. Message is sent to
B. Message is sent to John@xyznetwork.com
C. Message is sent to null
D. A compile error at line 1
E. A compile error at line 2
F. A compile error at line 9
G. A compile error at line 11
H. A compile error at other line



Next Question

Answer: B

Explain: An abstract class can have 0 or more abstract or concrete methods. A static nested class can extends any class, it can not access local variables or private instance variables of the enclosing class, however, the static nested class can access the private static variables of the enclosing class.

Study:  Develop code that uses abstract classes and methods

     Develop code that uses final keyword

     Create inner classes including static inner class, local class, nested class, and anonymous inner class