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2. Declarations and Access Control

Q: 19 Click the Task button.

Solution:
public class Single{
      private static Single instance;
      public static Single getInstance( ){
 if(instance==null) instance = create( );
      return instance;
   }
protectedSingle( ) {  }
staticSingle create ( ) { return new Single ( ) ; }
}
class SingleSub extends Shape{
  }

Q: 20 Given:
12. public class Test {
13. public enum Dogs {collie, harrier};
14. public static void main(String [] args) {
15. Dogs myDog = Dogs.collie;
16. switch (myDog) {
17. case collie:
18. System.out.print("collie ");
19. case harrier:
20. System.out.print("harrier ");
21. }
22. }
23. }
What is the result?
A. collie                                       B. harrier
C. Compilation fails.                    D. collie harrier
E. An exception is thrown at runtime.
Answer: D

Q: 21 Click the Exhibit button.
Given:
ClassA a = new ClassA();
a.methodA();
What is the result?

 

A. Compilation fails.
B. ClassC is displayed.
C. The code runs with no output.
D. An exception is thrown at runtime.

Answer: D

Q: 22 Click the Task button.

Solution:
public int update(int quantity,int adjust){
quantity=quantity+adjust;
return quantity;
}
public void call Update( ) {
int quant=100;
quant=update(quant,320);
System.out.println("the quantity is " +quant);
}

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