Question 1

The String class's valueOf() method accepts a string representation as an argument and returns its equivalent integer value.

Accepted Answer

A) True 
 B)False

Question 2

If your program needs to make a lot of changes to one or more string, you might consider using objects of this class:

Accepted Answer

A)  Character 
B)  String 
C)  StringBuilder 
D)  All of the above 
A)  Character 
B)  String 
C)  StringBuilder 
D)  All of the above

Question 3

Assuming that str is declared as follows: String str = "RSTUVWXYZ";
What value will be returned from str.charAt(5)?

Accepted Answer

A)  U 
B)  V 
C)  W 
D)  X 
A)  U 
B)  V 
C)  W 
D)  X

Question 4

What would be the results of executing the following code?
StringBuilder str = new StringBuilder(12);
Str)append("The cow");
Str)append(" jumped over the ");
Str)append("moon.");

Accepted Answer

A)  The program would crash. 
B)  str would reference "The cow jump". 
C)  str would reference "The cow jumped over the ". 
D)  str would reference "The cow jumped over the moon." 
A)  The program would crash. 
B)  str would reference "The cow jump". 
C)  str would reference "The cow jumped over the ". 
D)  str would reference "The cow jumped over the moon."

Question 5

Given the following statement, which of the following is NOT true?
Str)insert(8, 32);

Accepted Answer

A)  str is a StringBuilder type object. 
B)  The insert will start at position 32. 
C)  The starting position for the insert is 8. 
D)  The literal number 32 will be inserted. 
A)  str is a StringBuilder type object. 
B)  The insert will start at position 32. 
C)  The starting position for the insert is 8. 
D)  The literal number 32 will be inserted.

Question 6

The wrapper classes in Java are immutable, which means that once you create an object, you cannot change the object's value.

Accepted Answer

A) True 
 B)False

Question 7

What does the following statement do?
Double number = new Double(8.8);

Accepted Answer

A)  It creates a Double object. 
B)  It initializes that object to 8.8. 
C)  It assigns the object's address to the number variable. 
D)  All of the above 
A)  It creates a Double object. 
B)  It initializes that object to 8.8. 
C)  It assigns the object's address to the number variable. 
D)  All of the above

Question 8

What will be the value of loc after the following code is executed?
Int loc;
String str = "The cow jumped over the moon.";
Loc = str.indexOf("ov");

Accepted Answer

A)  15 
B)  16 
C)  17 
D)  18 
A)  15 
B)  16 
C)  17 
D)  18

Question 9

What is term used for a class that is "wrapped around" a primitive data type and allows you to create objects instead of variables?

Accepted Answer

A)  Intrinsic class 
B)  Enclosed object 
C)  Wrapper class 
D)  Transitional object 
A)  Intrinsic class 
B)  Enclosed object 
C)  Wrapper class 
D)  Transitional object

Question 10

Each of the numeric wrapper classes has a static ________ method that converts a number to a string.

Accepted Answer

A)  GetString 
B)  Parse 
C)  ToString 
D)  Convert 
A)  GetString 
B)  Parse 
C)  ToString 
D)  Convert

Question 11

If a non-letter is passed to the toLowerCase or toUpperCase method, it is returned unchanged.

Accepted Answer

A) True 
 B)False

Question 12

What will be the tokens for the following code?
String str = "123-456-7890";
String[] tokens = str.split("-");

Accepted Answer

A)  123, 456, and 7890 
B)  - 
C)  123, 456, 7890, and - 
D)  None of the above 
A)  123, 456, and 7890 
B)  - 
C)  123, 456, 7890, and - 
D)  None of the above

Question 13

You must call a method to get the value of a wrapper class object.

Accepted Answer

A) True 
 B)False

Question 14

When using the StringBuilder class's insert method, you can insert:

Accepted Answer

A)  any primitive type 
B)  a String object 
C)  a char array 
D)  All of the above 
A)  any primitive type 
B)  a String object 
C)  a char array 
D)  All of the above

Question 15

What will be the value of str after the following statements are executed?
StringBuilder str =
New StringBuilder("We have lived in Chicago, " +
"Trenton, and Atlanta.");
Str)replace(17, 24, "Tampa");

Accepted Answer

A)  We have lived in Tampa, Trenton, and Atlanta. 
B)  We have lived in Chicago, Tampa, and Atlanta. 
C)  We have lived in Tampa Trenton, and Tampa. 
D)  We have lived in Tampalanta. 
A)  We have lived in Tampa, Trenton, and Atlanta. 
B)  We have lived in Chicago, Tampa, and Atlanta. 
C)  We have lived in Tampa Trenton, and Tampa. 
D)  We have lived in Tampalanta.

Question 16

StringBuilder objects are immutable.

Accepted Answer

A) True 
 B)False

Question 17

If str is declared as: String str = "ABCDEFGHI";
What will be returned from Character.toLowerCase(str.charAt(5))?

Accepted Answer

A)  e 
B)  E 
C)  f 
D)  F 
A)  e 
B)  E 
C)  f 
D)  F

Question 18

In the following statement, what data type must recField be?
Str)getChars(5, 10, recField, 0);

Accepted Answer

A)  String 
B)  int 
C)  char 
D)  char[] 
A)  String 
B)  int 
C)  char 
D)  char[]

Question 19

What will be the value of matches after the following code is executed?
Boolean matches;
String[] productCodes = {"456HI345", "3456hj"};
Matches = productCodes[0].regionMatches(true, 1,
ProductCodes[1], 2, 3);

Accepted Answer

A)  56H 
B)  56h 
C)  true 
D)  False 
A)  56H 
B)  56h 
C)  true 
D)  False

Question 20

What does the following statement do?
Float number = new Float(8.8);

Accepted Answer

A)  It creates a Float object. 
B)  It initializes that object to 8.8. 
C)  It assigns the object's address to the number variable. 
D)  All of the above 
A)  It creates a Float object. 
B)  It initializes that object to 8.8. 
C)  It assigns the object's address to the number variable. 
D)  All of the above

The String class's valueOf() method accepts a string representation as an argument and returns its equivalent integer value.

If your program needs to make a lot of changes to one or more string, you might consider using objects of this class:

Assuming that str is declared as follows: String str = "RSTUVWXYZ"; What value will be returned from str.charAt(5)?

What would be the results of executing the following code? StringBuilder str = new StringBuilder(12); Str)append("The cow"); Str)append(" jumped over the "); Str)append("moon.");

Given the following statement, which of the following is NOT true? Str)insert(8, 32);

The wrapper classes in Java are immutable, which means that once you create an object, you cannot change the object's value.

What does the following statement do? Double number = new Double(8.8);

What will be the value of loc after the following code is executed? Int loc; String str = "The cow jumped over the moon."; Loc = str.indexOf("ov");

What is term used for a class that is "wrapped around" a primitive data type and allows you to create objects instead of variables?

Each of the numeric wrapper classes has a static ________ method that converts a number to a string.

If a non-letter is passed to the toLowerCase or toUpperCase method, it is returned unchanged.

What will be the tokens for the following code? String str = "123-456-7890"; String[] tokens = str.split("-");

You must call a method to get the value of a wrapper class object.

When using the StringBuilder class's insert method, you can insert:

What will be the value of str after the following statements are executed? StringBuilder str = New StringBuilder("We have lived in Chicago, " + "Trenton, and Atlanta."); Str)replace(17, 24, "Tampa");

StringBuilder objects are immutable.

If str is declared as: String str = "ABCDEFGHI"; What will be returned from Character.toLowerCase(str.charAt(5))?

In the following statement, what data type must recField be? Str)getChars(5, 10, recField, 0);

What will be the value of matches after the following code is executed? Boolean matches; String[] productCodes = {"456HI345", "3456hj"}; Matches = productCodes[0].regionMatches(true, 1, ProductCodes[1], 2, 3);

What does the following statement do? Float number = new Float(8.8);

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

Arrays and the Arraylist Class

A Second Look at Classes and Objects

Inheritance

Exceptions and Advanced File IO

A First Look at GUI Applications

Advanced GUI Applications

Applets and More

Creating GUI Applications With Javafx and Scene Builder

Recursion

Databases

Filters

Exam 9: Text Processing and More About Wrapper Classes

The String class's valueOf() method accepts a string representation as an argument and returns its equivalent integer value.

If your program needs to make a lot of changes to one or more string, you might consider using objects of this class:

Assuming that str is declared as follows: String str = "RSTUVWXYZ"; What value will be returned from str.charAt(5)?

What would be the results of executing the following code? StringBuilder str = new StringBuilder(12); Str)append("The cow"); Str)append(" jumped over the "); Str)append("moon.");

Given the following statement, which of the following is NOT true? Str)insert(8, 32);

The wrapper classes in Java are immutable, which means that once you create an object, you cannot change the object's value.

What does the following statement do? Double number = new Double(8.8);

What will be the value of loc after the following code is executed? Int loc; String str = "The cow jumped over the moon."; Loc = str.indexOf("ov");

What is term used for a class that is "wrapped around" a primitive data type and allows you to create objects instead of variables?

Each of the numeric wrapper classes has a static ________ method that converts a number to a string.

If a non-letter is passed to the toLowerCase or toUpperCase method, it is returned unchanged.

What will be the tokens for the following code? String str = "123-456-7890"; String[] tokens = str.split("-");

You must call a method to get the value of a wrapper class object.

When using the StringBuilder class's insert method, you can insert:

What will be the value of str after the following statements are executed? StringBuilder str = New StringBuilder("We have lived in Chicago, " + "Trenton, and Atlanta."); Str)replace(17, 24, "Tampa");

StringBuilder objects are immutable.

If str is declared as: String str = "ABCDEFGHI"; What will be returned from Character.toLowerCase(str.charAt(5))?

In the following statement, what data type must recField be? Str)getChars(5, 10, recField, 0);

What will be the value of matches after the following code is executed? Boolean matches; String[] productCodes = {"456HI345", "3456hj"}; Matches = productCodes[0].regionMatches(true, 1, ProductCodes[1], 2, 3);

What does the following statement do? Float number = new Float(8.8);

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

Arrays and the Arraylist Class

A Second Look at Classes and Objects

Inheritance

Exceptions and Advanced File IO

A First Look at GUI Applications

Advanced GUI Applications

Applets and More

Creating GUI Applications With Javafx and Scene Builder

Recursion

Databases

Filters