Question

JAVA

1.           

Given the following class definition, what are the contents of the fields x and y of the object p ?

   class MyPoint {

     int x;

     int y;

public MyPoint (int x, int y){

       x = x;

       y = y;

     }

---------------------------------------

MyPoint p = new MyPoint( 100, 88 );

2.            static and non-static members

What would happen if you tried to compile and run the following code ?

public class Driver

{

    private int num;

    public static void main (String [] args)

    {

       num = 10;

        System.out.println( “num has the value : “ + num );

    }

}

3.           When are two objects “equal” ?

Given the following class definition

class Sheep {

      public    String   name;    // yes yes, of course, data should always be

      public       int   id;      // private

      public Sheep ( String name , int id ){

               this.name = name;

              this.id = id;

      }

}

What would be the outcome of the following code snippet ?

Sheep a = new Sheep( “bo”, 101 );

Sheep b = new Sheep( “beep”, 999 );

Sheep c = b;

b.name = “bo”;

b.id   = 101 ;

if( c == b ) System.out.println( “c is the same as b” );      

   else System.out.println( “c is NOT the same as b” );

if( a.equals( b ) System.out.println( “a equals b ” );

   else System.out.println( “a does NOT equal b” )

4.            Instances and references

Given the previous definition of class Sheep expanded with a default constructor and a clone() method, we write:

Sheep a = new Sheep( “bo”, 101 );

Sheep b = new Sheep();

Sheep c = a;

Sheep[] flock1 ;

Sheep[] flock2 = new Sheep [5];

Sheep d = (Sheep) a.clone();

How many Sheep objects have been created ?

             

5.            shallow VS deep copies

Here is a definition of a class Shepherd. A Shepherd “has” a name and two Sheep members.

class Shepherd {

      public    String   name;

      public    Sheep    s1;

      public    Sheep    s2;

      public Shepherd ( String name , Sheep s1, Sheep s2){

     this.name = name;

      this.s1 = s1;

      this.s2 = s2;

      }

}

Shepherd Joe = new Shepherd( “Joe” , new Sheep(“Baa”, 111), new Sheep(“Bla”, 222) );

Shepherd Jill = Joe;

Is Jill a shallow or deep copy of Joe ?          

Jill.s1 = new Sheep( “Jill’s Sheep”, 999);

System.out.println( Joe.s1.name );

What will the above code output ?

5.            Cloning

Write a default constructor and a clone() method for the class Shepherd defined above

6.            Copy constructors

A copy constructor is a special kind of constructor that takes as a parameter an existing object of the same type and initializes the object under construction with the parameter object’s fields.

For example, If the previously defined Shepherd class had a copy constructor, we could have written the following

Shepherd Jill = new Shepherd( Joe );   // where Joe is an already initialized object

This would initialize Jill with the values of Jill’s fields.

Write a copy constructor for the class Shepherd.

Thank you.

Answer 1

Please do understand my concern, as per Chegg guidelines we are supposed to answer the first question if there is more than one question in a post, your downvote effects my career a lot, if I get a downvote for a wrong answer or incomplete answer I will accept it. Please give a positive rating

the value of x will be 100 and y will be 88