Question 1

Not every user-defined class can override the default definition of the method toString because it is provided by Java.

Accepted Answer

A) True 
 B)False  False

Question 2

Consider the following statements.public class Rectangle
{
Private double length;
Private double width; public Rectangle()
{
Length = 0;
Width = 0;
} public Rectangle(double l, double w)
{
Length = l;
Width = w;
} public void set(double l, double w)
{
Length = l;
Width = w;
} public void print()
{
System.out.println("Length = " + length
+ "; Width = " + width + "
" +
+ " Area = " + area()
+ "; Perimeter = " + perimeter());
} public double area()
{
Return length * width;
} public void perimeter()
{
Return 2 * length + 2 * width;
} public void makeCopy(Rectangle otherRect)
{
Length = otherRect.length;
Width = otherRect.width
}
}Rectangle tempRect = new Rectangle(14, 10);
Rectangle newRect = new Rectangle(9, 5);What are the values of the instance variables of newRect after the following statement execute?newRect.makeCopy(tempRect);

Accepted Answer

A)  length = 14; width = 10 
B)  length = 9; width = 5 
C)  length = 14; width = 5 
D)  None of these 
A)  length = 14; width = 10 
B)  length = 9; width = 5 
C)  length = 14; width = 5 
D)  None of these A

Question 3

Which of the following is used to allocate memory for the instance variables of an object of a class?

Accepted Answer

A)  the reserved word public 
B)  the reserved word static 
C)  the operator new 
D)  the operator + 
A)  the reserved word public 
B)  the reserved word static 
C)  the operator new 
D)  the operator + C

Question 4

Class members consist of all of the following EXCEPT ____.

Accepted Answer

A)  named constants 
B)  variable declarations 
C)  pre-defined methods 
D)  methods 
A)  named constants 
B)  variable declarations 
C)  pre-defined methods 
D)  methods

Question 5

MysteryClass
-first: int
-second: double;
+MysteryClass()
+MysteryClass(int)
+MysteryClass(double);
+MysteryClass(int, double)
+setData(int, double): void
+getFirst(): int
+getSecond(): double
+doubleFirst(): int
+squareSecond(): double
+print(): void
+equals(MysteryClass): boolean
+makeCopy(MysteryClass): void
+getCopy():MysteryClass
Which of the following would be a default constructor for the class MysteryClass shown in the accompanying figure?

Accepted Answer

A)  public MysteryClass(){ setData(0, 0.0); } 
B)  public MysteryClass(0, 0.0) { setData(); } 
C)  public MysteryClass(0) { setData(0, 0.0); } 
D)  private MysteryClass(10){ setData(); } 
A)  public MysteryClass(){ setData(0, 0.0); } 
B)  public MysteryClass(0, 0.0) { setData(); } 
C)  public MysteryClass(0) { setData(0, 0.0); } 
D)  private MysteryClass(10){ setData(); }

Question 6

Which of the following words indicates an object's reference to itself?

Accepted Answer

A)  this 
B)  that 
C)  public 
D)  protected 
A)  this 
B)  that 
C)  public 
D)  protected

Question 7

How many finalizers can a class have?

Accepted Answer

A)  zero 
B)  one 
C)  two 
D)  Any number 
A)  zero 
B)  one 
C)  two 
D)  Any number

Question 8

Classes that are defined within other classes are called inside classes.

Accepted Answer

A) True 
 B)False

Question 9

Constructors are called like any other method.

Accepted Answer

A) True 
 B)False

Question 10

Given the declaration public class MyClass
{
 private int x; public void print()
 {
 System.out.println("x = " + x);
 } private void setX(int y)
 {
 x = y;
 }
}
MyClass myObject = new MyClass();The following statement is legal.myObject.print();

Accepted Answer

A) True 
 B)False

Question 11

If a member of a class is a private method, you can access it outside the class.

Accepted Answer

A) True 
 B)False

Question 12

The methods of a class must be public.

Accepted Answer

A) True 
 B)False

Question 13

The components of a class are called fields.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is a constructor without parameters?

Accepted Answer

A)  copy constructor 
B)  default constructor 
C)  finalizer 
D)  modifier 
A)  copy constructor 
B)  default constructor 
C)  finalizer 
D)  modifier

Question 15

The default constructor executes when an object is instantiated and initialized using an existing object.

Accepted Answer

A) True 
 B)False

Question 16

MysteryClass
-first: int
-second: double;
+MysteryClass()
+MysteryClass(int)
+MysteryClass(double);
+MysteryClass(int, double)
+setData(int, double): void
+getFirst(): int
+getSecond(): double
+doubleFirst(): int
+squareSecond(): double
+print(): void
+equals(MysteryClass): boolean
+makeCopy(MysteryClass): void
+getCopy():MysteryClass
According to the UML class diagram in the accompanying figure, which of the following is a private member of the class MysteryClass?

Accepted Answer

A)  doubleFirst 
B)  MysteryClass 
C)  second 
D)  print 
A)  doubleFirst 
B)  MysteryClass 
C)  second 
D)  print

Question 17

A class and its members can be described graphically using Unified Modeling Language (UML) notation.

Accepted Answer

A) True 
 B)False

Question 18

public class Secret
{
Private int x;
Private static int y;
Public static int count;
Public int z;
Public Secret()
{
X = 0;
Z = 1;
} public Secret(int a)
{
X = a;
} public Secret(int a, int b)
{
X = a;
Y = b;
} public String toString()
{
Return ("x = " + x + ", y = " + y + ",
Count = " + count);
} public static void incrementY()
{
Y++;
}
}How many constructors are present in the class definition in the accompanying figure?

Accepted Answer

A)  zero 
B)  one 
C)  two 
D)  three 
A)  zero 
B)  one 
C)  two 
D)  three

Question 19

What is the main use of inner classes?

Accepted Answer

A)  To alter the behavior of the outer class 
B)  To handle events 
C)  To implement cascaded method calls 
D)  To provide information hiding 
A)  To alter the behavior of the outer class 
B)  To handle events 
C)  To implement cascaded method calls 
D)  To provide information hiding

Question 20

Constructors have the same name as the ____.

Accepted Answer

A)  member methods 
B)  data members 
C)  class 
D)  package 
A)  member methods 
B)  data members 
C)  class 
D)  package

Not every user-defined class can override the default definition of the method toString because it is provided by Java.

Which of the following is used to allocate memory for the instance variables of an object of a class?

Class members consist of all of the following EXCEPT ____.

Which of the following words indicates an object's reference to itself?

How many finalizers can a class have?

Classes that are defined within other classes are called inside classes.

Constructors are called like any other method.

Given the declaration public class MyClass { private int x; public void print() { System.out.println("x = " + x); } private void setX(int y) { x = y; } } MyClass myObject = new MyClass();The following statement is legal.myObject.print();

If a member of a class is a private method, you can access it outside the class.

The methods of a class must be public.

The components of a class are called fields.

Which of the following is a constructor without parameters?

The default constructor executes when an object is instantiated and initialized using an existing object.

A class and its members can be described graphically using Unified Modeling Language (UML) notation.

What is the main use of inner classes?

Constructors have the same name as the ____.

An Overview of Computers and Programming Languages

Basic Elements of Java

Introduction to Objects and Input/output

Control Structures I: Selection

Control Structures II: Repetition

Graphical User Interface GUI and Object-Oriented Design OOD

User-Defined Methods

Arrays

Inheritance and Polymorphism

Handling Exceptions and Events

Advanced Guis and Graphics

Recursion

Applications of Arrays Searching and Sorting and Strings

Filters

Exam 8: User-Defined Classes

Not every user-defined class can override the default definition of the method toString because it is provided by Java.

Which of the following is used to allocate memory for the instance variables of an object of a class?

Class members consist of all of the following EXCEPT ____.

Which of the following words indicates an object's reference to itself?

How many finalizers can a class have?

Classes that are defined within other classes are called inside classes.

Constructors are called like any other method.

Given the declaration public class MyClass { private int x; public void print() { System.out.println("x = " + x); } private void setX(int y) { x = y; } } MyClass myObject = new MyClass();The following statement is legal.myObject.print();

If a member of a class is a private method, you can access it outside the class.

The methods of a class must be public.

The components of a class are called fields.

Which of the following is a constructor without parameters?

The default constructor executes when an object is instantiated and initialized using an existing object.

A class and its members can be described graphically using Unified Modeling Language (UML) notation.

What is the main use of inner classes?

Constructors have the same name as the ____.

An Overview of Computers and Programming Languages

Basic Elements of Java

Introduction to Objects and Input/output

Control Structures I: Selection

Control Structures II: Repetition

Graphical User Interface GUI and Object-Oriented Design OOD

User-Defined Methods

Arrays

Inheritance and Polymorphism

Handling Exceptions and Events

Advanced Guis and Graphics

Recursion

Applications of Arrays Searching and Sorting and Strings

Filters