CSE 205 Final Questions and Answers 100% Solved

CSE 205 Final

Having multiple class methods of the same name where each method has a different
number of or type of parameters is known as

a) method overloading
b) Encapsulation
c) importing
d) information hiding
e) encapsulation – answer a) method overloading

The relationship between a class and an object is best described as

a) objects are instances of classes
b) classes are instances of objects
c) classes are programs while objects are variables
d) objects and classes are the same thing
e) objects are the instance data of classes – answer a) objects are instances of classes

To define a class that will represent a car, which of the following definitions is most
appropriate?

a) public class CAR
b) public class car
c) private class car
d) private class Car
e) public class Car - answere) public class Car

Which of the following reserved words in Java is used to create an instance of a class?

a) new
b) public
c) public or private, either could be used
d) class
e) import - answera) new

What does acronym API stands for?
a) Application Parameter Internet
b) Application Programming Interface
c) Apply Programming Interactive
d) Abstraction Programming Interface - answerb) Application Programming Interface

A class' constructor usually defines

,a) how an object is initialized
b) how an object is interfaced
c) if the instance data are accessible outside of the object directly
d) the number of methods in the class
e) the number of instance data in the class - answera) how an object is initialized

Java methods can return only primitive types (int, double, float, char, boolean, etc).

True
False - answerFalse

All Java classes must contain a main method which is the first method executed when
the Java class is called upon.

True
False - answerFalse

use the following class definition
import java.text.DecimalFormat;
public class Student
{ private String name;
private String major;
private double gpa;
private int hours;
public Student(String newName, String newMajor, double newGPA, int newHours)
{ name = newName;
major = newMajor;
gpa = newGPA;
hours = newHours;
}
public String toString( )
{ DecimalFormat df = new DecimalFormat("0.000");
return name + "\n" + major + "\n" + df.format(gpa) + "\n" + hours
}
}
Which of the following could be used to instantiate a new Student s1?

a) new Student(s1);
b) new Student s1 = ("Jane Doe", "Computer Science", 3.333, 33);
c) Student s1 = new Student("Jane Doe", "Computer Science", 3.333, 33);
d) Student s1 = new Student( );
e) s1 = new Student( ); - answerc) Student s1 = new Student("Jane Doe", "Computer
Science", 3.333, 33);

,Consider a method defined with the header: public void foo(int a, int b). Which of the
following method calls is legal?
a) foo(, 2 * 3);
b) foo(0, 0.1);
c) foo(0);
d) foo(1 + 2, 3 * 0.1);
e) foo( ); - answera) foo(, 2 * 3);

Use the following partial class definitions:
public class A1
{
public int x;
private int y;
protected int z;
...
}
public class A2 extends A1
{
protected int a;
private int b;
...
}
public class A3 extends A2
{
private int q;
...
}
Which of the following is true with respect to A1, A2 and A3?

a) A2 and A3 are both subclasses of A1
b) A1 and A2 are both subclasses of A3
c) A1 is a subclass of A2 and A2 is a subclass of A3
d) A3 is a subclass of A2 and A2 is a subclass of A1 - answerd) A3 is a subclass of A2
and A2 is a subclass of A1

Use the following partial class definitions:
public class A1
{
public int x;
private int y;
protected int z;
...
}
public class A2 extends A1
{
protected int a;

, private int b;
...
}
public class A3 extends A2
{
private int q;
...
}
Which of the following lists of instance data are accessible in class A2?

a) z, a, b
b) x, y, z, a
c) x, y, z, a, b
d) a, b
e) x, z, a, b - answere) x, z, a, b

Use the following partial class definitions:
public class A1
{
public int x;
private int y;
protected int z;
...
}
public class A2 extends A1
{
protected int a;
private int b;
...
}
public class A3 extends A2
{
private int q;
...
}
Which of the following lists of instance data are accessible in A3?

a) x, z, a, q
b) x, y, z, a, b, q
c) a, q
d) x, a, q
e) a, b, q - answera) x, z, a, q

Use the following partial class definitions:
public class A1
{