Question 1

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

Accepted Answer

A) True 
 B)False  False

Question 2

An example of passing message to a String where the message has a String parameter would occur in which of the following messages?

Accepted Answer

A)  length 
B)  substring 
C)  equals 
D)  toUpperCase 
E)  none of the above, it is not possible to pass a String as a parameter in a message to a String 
A)  length 
B)  substring 
C)  equals 
D)  toUpperCase 
E)  none of the above, it is not possible to pass a String as a parameter in a message to a String C

Question 3

Write a statement to instantiate a cube with a length of 3, width of 3, and height of 3.

Accepted Answer

Box cube = new Box(3);

Question 4

What happens if you declare a class constructor to have a void return type?

Accepted Answer

A)  You'll likely receive a syntax error 
B)  The program will compile with a warning, but you'll get a runtime error 
C)  There's nothing wrong with declaring a constructor to be void 
D)  The class' default constructor will be used instead of the one you're declaring 
E)  None of the above 
A)  You'll likely receive a syntax error 
B)  The program will compile with a warning, but you'll get a runtime error 
C)  There's nothing wrong with declaring a constructor to be void 
D)  The class' default constructor will be used instead of the one you're declaring 
E)  None of the above

Question 5

Formal parameters are those that appear in the method call and actual parameters are those that appear in the method header.

Accepted Answer

A) True 
 B)False

Question 6

Write the statement to instantiate an Box object, blueBox, with a length of 6, width of 4, and height of 2.

Accepted Answer

Box blueBo

Question 7

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

Accepted Answer

A)  private class car 
B)  public class car 
C)  public class Car 
D)  public class CAR 
E)  private class Car 
A)  private class car 
B)  public class car 
C)  public class Car 
D)  public class CAR 
E)  private class Car

Question 8

A class' constructor usually defines

Accepted Answer

A)  how an object is initialized 
B)  how an object is interfaced 
C)  the number of instance data in the class 
D)  the number of methods in the class 
E)  if the instance data are accessible outside of the object directly 
A)  how an object is initialized 
B)  how an object is interfaced 
C)  the number of instance data in the class 
D)  the number of methods in the class 
E)  if the instance data are accessible outside of the object directly

Question 9

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

Accepted Answer

A)  classes are instances of objects 
B)  objects are instances of classes 
C)  objects and classes are the same thing 
D)  classes are programs while objects are variables 
E)  objects are the instance data of classes 
A)  classes are instances of objects 
B)  objects are instances of classes 
C)  objects and classes are the same thing 
D)  classes are programs while objects are variables 
E)  objects are the instance data of classes

Question 10

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

Accepted Answer

A)  encapsulation 
B)  information hiding 
C)  tokenizing 
D)  importing 
E)  method overloading 
A)  encapsulation 
B)  information hiding 
C)  tokenizing 
D)  importing 
E)  method overloading

Question 11

A constructor may contain a return statement so long as no value (or expression) is returned.

Accepted Answer

A) True 
 B)False

Question 12

The expressions that are passed to a method in an invocation are called

Accepted Answer

A)  actual parameters 
B)  formal parameters 
C)  formal arguments 
D)  formals 
E)  any of the above 
A)  actual parameters 
B)  formal parameters 
C)  formal arguments 
D)  formals 
E)  any of the above

Question 13

If a method does not have a return statement, then

Accepted Answer

A)  it will produce a syntax error when compiled 
B)  it must be a void method 
C)  it can not be called from outside the class that defined the method 
D)  it must be defined to be a public method 
E)  it must be an int, double, float or String method 
A)  it will produce a syntax error when compiled 
B)  it must be a void method 
C)  it can not be called from outside the class that defined the method 
D)  it must be defined to be a public method 
E)  it must be an int, double, float or String method

Question 14

The following method header definition will result in a syntax error: public void aMethod( );

Accepted Answer

A) True 
 B)False

Question 15

Consider a method defined with the header: public void doublefoo(double x). Which of the following method calls is legal?

Accepted Answer

A)  doublefoo(0); 
B)  doublefoo(0.555); 
C)  doublefoo(0.1 + 0.2); 
D)  doublefoo(0.1, 0.2); 
E)  all of the above are legal except for D 
A)  doublefoo(0); 
B)  doublefoo(0.555); 
C)  doublefoo(0.1 + 0.2); 
D)  doublefoo(0.1, 0.2); 
E)  all of the above are legal except for D

Question 16

Assume method0 calls method1 and method2, method1 calls method3 which calls method4 and method5. Explain the chain of method calls (what order methods are called and from which method).

Accepted Answer

method0 calls method1 which calls method

Question 17

While multiple objects of the same class can exist, in a given program there can be only one version of each class.

Accepted Answer

A) True 
 B)False

Question 18

In a UML diagram for a class

Accepted Answer

A)  classes are represented as rectangles 
B)  there may be a section containing the name of the class 
C)  there may be a section containing the attributes (data) of the class 
D)  there may be a section containing the methods of the class 
E)  all of the above 
A)  classes are represented as rectangles 
B)  there may be a section containing the name of the class 
C)  there may be a section containing the attributes (data) of the class 
D)  there may be a section containing the methods of the class 
E)  all of the above

Question 19

Visibility modifiers include

Accepted Answer

A)  public, private 
B)  public, private, protected 
C)  public, private, protected, final 
D)  public, protected, final, static 
E)  public, private, protected, static 
A)  public, private 
B)  public, private, protected 
C)  public, private, protected, final 
D)  public, protected, final, static 
E)  public, private, protected, static

Question 20

Write a toString method that returns the player's name, position and batting average formatted to have 1 digit to the left of the decimal and 3 digits to the right of the decimal. Assume DecimalFormat has been imported.

Accepted Answer

public String toString( )
{
De

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

An example of passing message to a String where the message has a String parameter would occur in which of the following messages?

Write a statement to instantiate a cube with a length of 3, width of 3, and height of 3.

What happens if you declare a class constructor to have a void return type?

Formal parameters are those that appear in the method call and actual parameters are those that appear in the method header.

Write the statement to instantiate an Box object, blueBox, with a length of 6, width of 4, and height of 2.

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

A class' constructor usually defines

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

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

A constructor may contain a return statement so long as no value (or expression) is returned.

The expressions that are passed to a method in an invocation are called

If a method does not have a return statement, then

The following method header definition will result in a syntax error: public void aMethod( );

Consider a method defined with the header: public void doublefoo(double x). Which of the following method calls is legal?

Assume method0 calls method1 and method2, method1 calls method3 which calls method4 and method5. Explain the chain of method calls (what order methods are called and from which method).

While multiple objects of the same class can exist, in a given program there can be only one version of each class.

In a UML diagram for a class

Visibility modifiers include

Write a toString method that returns the player's name, position and batting average formatted to have 1 digit to the left of the decimal and 3 digits to the right of the decimal. Assume DecimalFormat has been imported.

Introduction

Data and Expressions

Using Classes and Objects

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters

Exam 4: Writing Classes

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

An example of passing message to a String where the message has a String parameter would occur in which of the following messages?

Write a statement to instantiate a cube with a length of 3, width of 3, and height of 3.

What happens if you declare a class constructor to have a void return type?

Formal parameters are those that appear in the method call and actual parameters are those that appear in the method header.

Write the statement to instantiate an Box object, blueBox, with a length of 6, width of 4, and height of 2.

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

A class' constructor usually defines

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

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

A constructor may contain a return statement so long as no value (or expression) is returned.

The expressions that are passed to a method in an invocation are called

If a method does not have a return statement, then

The following method header definition will result in a syntax error: public void aMethod( );

Consider a method defined with the header: public void doublefoo(double x). Which of the following method calls is legal?

Assume method0 calls method1 and method2, method1 calls method3 which calls method4 and method5. Explain the chain of method calls (what order methods are called and from which method).

While multiple objects of the same class can exist, in a given program there can be only one version of each class.

In a UML diagram for a class

Visibility modifiers include

Write a toString method that returns the player's name, position and batting average formatted to have 1 digit to the left of the decimal and 3 digits to the right of the decimal. Assume DecimalFormat has been imported.

Introduction

Data and Expressions

Using Classes and Objects

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters