Question 1

Which of the following statements is false?

Accepted Answer

A)  If a method does not return a value, the return-value-type in the method declaration can be omitted. 
B)  Placing a semicolon after the right parenthesis enclosing the parameter list of a method declaration is a syntax error. 
C)  Redeclaring a method parameter as a local variable in the method's body is a compilation error. 
D)  Forgetting to return a value from a method that should return a value is a compilation error. 
A)  If a method does not return a value, the return-value-type in the method declaration can be omitted. 
B)  Placing a semicolon after the right parenthesis enclosing the parameter list of a method declaration is a syntax error. 
C)  Redeclaring a method parameter as a local variable in the method's body is a compilation error. 
D)  Forgetting to return a value from a method that should return a value is a compilation error. A

Question 2

Variables should be declared as fields only if ________.

Accepted Answer

A)  they are local variables 
B)  they are used only within a method 
C)  they are required for use in more than one method or their values must be saved between calls to the class's methods 
D)  they are arguments 
A)  they are local variables 
B)  they are used only within a method 
C)  they are required for use in more than one method or their values must be saved between calls to the class's methods 
D)  they are arguments C

Question 3

Which is a correct static method call of Math class method sqrt?

Accepted Answer

A)  sqrt(900); 
B)  math.sqrt(900); 
C)  Math.sqrt(900); 
D)  Math math = new Math(); math.sqrt(900); 
A)  sqrt(900); 
B)  math.sqrt(900); 
C)  Math.sqrt(900); 
D)  Math math = new Math(); math.sqrt(900); C

Question 4

Declaring main as static allows the JVM to invoke main ________.

Accepted Answer

A)  without knowing the name of the class in which main is declared. 
B)  by creating an object of the class in which main is declared. 
C)  without creating an instance of the class in which main is declared. 
D)  None of the above. 
A)  without knowing the name of the class in which main is declared. 
B)  by creating an object of the class in which main is declared. 
C)  without creating an instance of the class in which main is declared. 
D)  None of the above.

Question 5

A well-designed method ________.

Accepted Answer

A)  performs multiple unrelated tasks 
B)  repeats code found in other methods 
C)  contains thousands of lines of code 
D)  performs a single, well-defined task 
A)  performs multiple unrelated tasks 
B)  repeats code found in other methods 
C)  contains thousands of lines of code 
D)  performs a single, well-defined task

Question 6

Which operator can be used in string concatenation?

Accepted Answer

A)  * 
B)  += 
C)  ++ 
D)  =+ 
A)  * 
B)  += 
C)  ++ 
D)  =+

Question 7

An overloaded method is one that ________.

Accepted Answer

A)  has a different name than another method, but the same parameters 
B)  has the same name as another method, but different parameters (by number, types or order of the types) 
C)  has the same name and parameters as a method defined in another class 
D)  has the same name and parameters, but a different return type as another method 
A)  has a different name than another method, but the same parameters 
B)  has the same name as another method, but different parameters (by number, types or order of the types) 
C)  has the same name and parameters as a method defined in another class 
D)  has the same name and parameters, but a different return type as another method

Question 8

Stacks are known as ________ data structures.

Accepted Answer

A)  FIFO. 
B)  FILO. 
C)  LIFO. 
D)  LILO. 
A)  FIFO. 
B)  FILO. 
C)  LIFO. 
D)  LILO.

Question 9

Method calls cannot be distinguished by ________.

Accepted Answer

A)  method name 
B)  return type 
C)  parameter lists 
D)  method signature 
A)  method name 
B)  return type 
C)  parameter lists 
D)  method signature

Question 10

A set of named constants that start with the value 0 for the first constant and increment by 1 for each subsequent constant can be declared as a(n) ________.

Accepted Answer

A)  class 
B)  enum 
C)  enumeration 
D)  None of the above. 
A)  class 
B)  enum 
C)  enumeration 
D)  None of the above.

Question 11

Consider the following Java statements: 
int x = 9;
Double y = 5.3;
Result = calculateValue(x, y);
Which of the following statements is false?

Accepted Answer

A)  A method is called with its name and parentheses. 
B)  x and y are parameters. 
C)  Copies of x and y are passed to the method calculateValue. 
D)  x and y are arguments. 
A)  A method is called with its name and parentheses. 
B)  x and y are parameters. 
C)  Copies of x and y are passed to the method calculateValue. 
D)  x and y are arguments.

Question 12

Which of the following statements is false?

Accepted Answer

A)  The Java API consists of packages. 
B)  The Java API helps programmers avoid "reinventing the wheel." 
C)  The Java API consists of import declarations. 
D)  None of the above. 
A)  The Java API consists of packages. 
B)  The Java API helps programmers avoid "reinventing the wheel." 
C)  The Java API consists of import declarations. 
D)  None of the above.

Question 13

The parameter list in the method header and the arguments in the method call must agree in:

Accepted Answer

A)  number 
B)  type 
C)  order 
D)  all of the above 
A)  number 
B)  type 
C)  order 
D)  all of the above

Question 14

A static method can ________.

Accepted Answer

A)  call only other static methods of the same class directly 
B)  manipulate only static fields in the same class directly 
C)  be called using the class name and a dot (.) 
D)  All of the above. 
A)  call only other static methods of the same class directly 
B)  manipulate only static fields in the same class directly 
C)  be called using the class name and a dot (.) 
D)  All of the above.

Question 15

Which of the following is not a package in the Java API?

Accepted Answer

A)  java.component 
B)  java.awt.event 
C)  javax.swing.event 
D)  java.lang 
A)  java.component 
B)  java.awt.event 
C)  javax.swing.event 
D)  java.lang

Question 16

Which of the following can be an argument to a method?

Accepted Answer

A)  Constants. 
B)  Variables. 
C)  Expressions. 
D)  All of the above. 
A)  Constants. 
B)  Variables. 
C)  Expressions. 
D)  All of the above.

Question 17

Which of the following primitive types is never promoted to another primitive type?

Accepted Answer

A)  double. 
B)  byte. 
C)  boolean. 
D)  Both a and c 
A)  double. 
B)  byte. 
C)  boolean. 
D)  Both a and c

Question 18

Overloaded methods always have the same _________.

Accepted Answer

A)  method name 
B)  return type 
C)  number of parameters 
D)  order of the parameters 
A)  method name 
B)  return type 
C)  number of parameters 
D)  order of the parameters

Question 19

Which statement creates a random value from the sequence 2, 5, 8, 11 and 14. Suppose randomNumbers is a SecureRandom object.

Accepted Answer

A)  2 + 5 * randomNumbers.nextInt(3); 
B)  3 + 2 * randomNumbers.nextInt(5); 
C)  5 + 3 * randomNumbers.nextInt(2); 
D)  2 + 3 * randomNumbers.nextInt(5); 
A)  2 + 5 * randomNumbers.nextInt(3); 
B)  3 + 2 * randomNumbers.nextInt(5); 
C)  5 + 3 * randomNumbers.nextInt(2); 
D)  2 + 3 * randomNumbers.nextInt(5);

Question 20

Which statement below could be used to simulate the outputs of rolling a six-sided die? Suppose randomNumbers is a SecureRandom object.

Accepted Answer

A)  1 + randomNumbers.nextInt(6); 
B)  1 + randomNumbers.nextInt(2); 
C)  6 + randomNumbers.nextInt(1); 
D)  3 + randomNumbers.nextInt(3); 
A)  1 + randomNumbers.nextInt(6); 
B)  1 + randomNumbers.nextInt(2); 
C)  6 + randomNumbers.nextInt(1); 
D)  3 + randomNumbers.nextInt(3);

Exam 6: Methods: a Deeper Look

Which of the following statements is false?

Variables should be declared as fields only if ________.

Which is a correct static method call of Math class method sqrt?

Declaring main as static allows the JVM to invoke main ________.

A well-designed method ________.

Which operator can be used in string concatenation?

An overloaded method is one that ________.

Stacks are known as ________ data structures.

Method calls cannot be distinguished by ________.

A set of named constants that start with the value 0 for the first constant and increment by 1 for each subsequent constant can be declared as a(n) ________.

Consider the following Java statements: int x = 9; Double y = 5.3; Result = calculateValue(x, y); Which of the following statements is false?

Which of the following statements is false?

The parameter list in the method header and the arguments in the method call must agree in:

A static method can ________.

Which of the following is not a package in the Java API?

Which of the following can be an argument to a method?

Which of the following primitive types is never promoted to another primitive type?

Overloaded methods always have the same _________.

Which statement creates a random value from the sequence 2, 5, 8, 11 and 14. Suppose randomNumbers is a SecureRandom object.

Which statement below could be used to simulate the outputs of rolling a six-sided die? Suppose randomNumbers is a SecureRandom object.

Introduction to Computers, the Internet and Java

Introduction to Java Applications; Inputoutput and Operators

Introduction to Classes, Objects, Methods and Strings

Control Statements: Assignment, and Operators

Control Statements: Logical Operators

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism and Interfaces

Exception Handling: a Deeper Look

Javafx Graphical User Interfaces

Javafx Gui

Strings, Characters and Regular Expressions

Files, Inputoutput Streams, Nio and Xml Serialization

Generic Collections

Lambdas and Streams

Recursion

Searching, Sorting and Big O

Generic Classes and Methods: a Deeper Look

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

Swing Gui Components

Graphics and Java 2d

Networking

Java Persistence Api Jpa

Javaserver Faces Web Apps

Javaserver Faces Web Apps

Swing Gui Components

Filters