What is wrong with the following program

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1. ( ) What is wrong with the following program?

1  public class MyClassA {2    int v = 12;3 
4    public MyClassA (int pV) {5      v = pV;6    } 7 
8    public static void main (String args []) {9      MyClassA m = new MyClassA ();10   } // end main11 } // end class MyClassA

2. ( ) What is wrong with the following program?

1  public class MyClassB {2    int v = 12;3 
4    public void MyClassB (int pV) {5      v = pV;6    } 7 
8    public static void main (String args []) {9      MyClassB m = new MyClassB (23);10   } // end main11 } // end class MyClassB

3. ( ) What is wrong with the following program? (updated 5/26, line 11)

1   public class MyClassD {2     public static void main (String args []) {3       MyClassC m = new MyClassC (23);4     } // end main5   } // end class MyClassD6 
7   public class MyClassC {8     int v = 12;9 
10    public MyClassC (int pV) {11      int v = pV;12    } 13 
14  } // end class MyClassC

4. ( ) What is wrong with the following program?

1   public class MyClassD {2     public static void main (String args []) {3       MyClassC m = new MyClassC (23);4     } // end main5   } // end class MyClassC6 
7   class MyClassC {8     int v = 12;9 
10    private MyClassC (int pV) {11      v = pV;12    } 13 
14  } // end class MyClassC

5. ( ) Given all the problems identified in problems 1 through 4, explain in detail why the following code works, ie, compiles without errors or warnings.

1  public class MyClassD {2    public static void main (String args []) {3      MyClassC m = new MyClassC (23, true);4    } // end main5  } // end class MyClassD6 
7  class MyClassC {8    int v = 12;9 
10   public MyClassC (int x, boolean b) {11     this (x);12   } 13 
14   private MyClassC (int pV) {15     v = pV;16   } 17 
18 } // end class MyClassC

6. ( ) Explain why the following class hierarchy is not reasonable:

• DefenseDepartment
• General
• Private

7. ( ) Give at least one example of a reasonable field for each of the following classes in the following class hierarchy. Be sure that the field is at the right level in the hierarchy.

• Vehicle
• Car
• Airplane
• Passenger
• Fighter
• Bomber
• SpaceShip

8. ( ) Give at least one example of a reasonable method for each of the following classes in the following class hierarchy. Be sure that the method  is at the right level in the hierarchy. Constructors, getters and setters don't count for this problem.

• Vehicle
• Car
• Airplane
• Passenger
• Fighter
• Bomber
• SpaceShip

9. ( ) Are a Private and a Platoon in an encapsulation or an inheritance relationship? Explain

10. ( ) Present reasonable parent and child classes for the class Tree (the kind with leaves). Give a short explanation for why the classes you are proposing are in good parent-child relationships.