Use the following class for the next questions. Which of the following could be

Question

Use the following class for the next questions.

Which of the following could be used to instantiate a new Person p? Select all that apply. new Person p-("Carla Doe", "789 Broad Street, 26) Person p-new Person("Janet Jones, "456 Orange Avenue", 16.5); new Person(p): p-new Person0 Person p- new Person"John Smith, "123 Main Street", 42) Person p-new Person: Assume that another method has been defined that will return the a person's phone number. The method header is: public String getPhoneNumber() If p is an object of type Person, which of the following are correct statements to obtain p's phone number? Select all that apply. p getPhoneNumberd: getPhoneNumber(p); O p.toString: String-getPhoneNumber(p): String s p.getPhoneNumber0: O p.getPhoneNumber):

Explanation / Answer

Given Program-:

public class Person {

   private String name;

   private String address;

   private int age;

   public Person(String newName, String newAddress, int newAge) {

      name = newName;

      address = newAddress;

      age = newAge;

   }

   public String toString() {

      String s = name + " " + newAddress+ " " + age;

      return s;

   }

   public void vote() {

      System.out.println(name + " is voting.");

   }

}

Question 1 -: Which of the following could be used to instantiate a new Person p ?

Options-:  

a) new Person p = ("Carla Deo","789 Broad Street",26);

b) Person p = new Person ("janet Jones","456 Orange Avenue",16.5);

c) new Person(p);

d) p = new Person();

e) Person p = new Person ("john Smith","123 Main Street",42);

f) Person p = new Person ();

Answer is Option e) Person p = new Person ("john Smith","123 Main Street",42);

Explanation-: In program for parameter Person constructor data type String, String and int is required.

And syntax for that is Person p= new Person(“String parameter”,” String parameter”,int Paramter).

Question 2 -: Assume that another method has been defined that will return the a person's phone number.The method header is:

Options-:

a) p =getPhoneNumber();

b) getPhoneNumber(p);

c) p.toString();

d) String = getPhoneNumber();

e) String s = p.getPhoneNumber();

f) p.getPhoneNumber();

Answer is Option f) p.getPhoneNumber();

Explanation-: For calling any method we use object of the class dot(.) function name.

Question 3 -: What type of variable is age?

Options-:

a) Actual Parameter

b) Instance data

c) local variable

d) None of these

e) formal parameter

Answer is Option b) Instance data

Explanation-: Instance variables are declared in a class and but outside of the class. Whenever object of the class is created at that time instance variable get created (get memory space.)

Question 4 -: What type of variable is newName?

Options-:

a) formal parameter

b) actual parameter

c) local variable

d) instance data

e) none of these

Answer is Option a) formal parameter

Explanation-Formal parameter defined in method declaration. In above Program newname is defined in constructor. Actual parameter in which we pass actual value to the method.

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