Use the following class for the next questions. Which of the following could be
ID: 3745641 • Letter: U
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.