1. Declare a two dimensional array of strings named bob.

2. Instantiate bob with five rows and three columns.

3. Assign “car” to the element in the last row and last column of bob.

4. Declare a variable named john suitable for holding the number of chairs in this room.

5. Given a class defined in the file MyClass.java, declare and instantiate an object of the class using the default constructor; name it tom.

6. Write the header for the main method of a java application.

7. Identify and explain any errors in the following

File:
interface
{
public String getName();
}

File: Harvey.java
public class Harvey implements
{
private int one;
private int two = 10;
private Scanner steve;

Harvey( int one )
{
// changes instance variable to value of argument
      one = one;
}

public void setTwo( int t )
{
// changes instance variable to value of argument
      two = t;
}

public int getOne()
{
      return one;
}

public int getTwo()
{
      return two;
}

private int product()
{
      return one*two;
}
. . .
}

Assuming the errors in the code from #32 have been corrected, what would be the result of the following?

8. Harvey tom = new Harvey();

9. Harvey jill = new Harvey(5);
System.out.println( jill.getOne() );

10. Harvey fred = new Harvey( 10 );
System.out.println( fred.getTwo() );

11. Harvey james = new Harvey( 13 );
System.out.println( james.product() );

12. Harvey edna = new Harvey( 15 );
edna.one = 33;

13. Harvey paul = new Harvey( 1, 2, 3 );

1. Write the header for a class PieceWorker which inherits from a class Employee.

2. Call superclass Employee’s toString() method from subclass PieceWorker’s toString() method.

3. Given Employee’s method
            public int getValue( float bob )
write the header for class PieceWorker’s overriden getValue method.

4. Write the header for the main method of a Java application.

5. Identify any errors:

public class Bob
{
   private int v;
// constructor initializes instance variable to parameter value
   Bob(int v)
   {
         v = v;
   }
   @Override
      private String toString()
      {
         System.out.println( v );
      }
      public int getV()
      {
         return v;
      }
      public String someMethod()
      {
         return “Hello Bob”;
      }
      // … other methods
}

6. Class June is intended to inherit from class Bob, identify any errors:

public class June inherits Bob
{
private float h;
// constructor initializes instance variables to parameter values
June(int v, float q )
{
      h = q;
}

public String someMethod()
{
   return “Hello June”;
}

// other members

}

Assuming all errors in 38 and 39 are corrected,

7. Instantiate an object of type June with state v=3, h=2.5.

8. Write the June method to override toString() to return the value of the instance variables.

9. Write the header for an overloaded June method getV.

10. Utilize a reference to a Bob named henry to instantiate an object of type June with state v=5, h=3.2.

11. Given #43 what would be the results of
         System.out.println( henry.someMethod() );

1. Polymorphism enables you to deal in generalities and let the __________________ handle the specific.

2. In polymorphism the type of the ____________ ____________ determines which method is called.

3. You can use the ________________ operator to determine if a particular object is an instance of a specified class.

4. Write the header for a public abstract method named getData() which returns a String.

5. Write the header for a class PieceWorker which inherits from a class Employee.

6. Write the header for an public abstract class MyClass.

7. Write the code fragment which will determine if object bob is a member of MyClass.

8. Write the code fragment which will convert the reference to object bob to a reference to an object of type MyClass.

9. Write the header for class Sub which inherits from abstract class Base and DOES NOT implement abstract methods defined in Base.

10. Write the header for class Sub which inherits from abstract class Base and DOES implement abstract methods defined in Base.

11. Write the header for the interface myInterface which may be used by any class.

12. Write the header for a public class TheClass which must respond to all of the methods in an interface myInterface.

1. Declare a two dimensional array of strings named bob. 2. Inst...