Deck 9: Text Processing and More About Wrapper Classes

Question 1

You cannot assign a value to a wrapper class object.

Answer 1

False

Question 2

The term ________ commonly is used to refer to a string that is part of another string.

A) strand
B) substring
C) character fragment
D) nested string

Answer 2

B

Question 3

You can change the contents of a StringBuilder object, but you cannot change the contents of a String object.

Answer 3

True

Question 4

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

A) intrinsic class
B) enclosed object
C) wrapper class
D) transitional object

Question 5

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

Question 6

The following statement correctly creates a StringBuilder object.
StringBuilder str = "Tuna sandwich";

Question 7

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

Question 8

The ________ character appears at the end (the right side) of a string, after the non-space characters.

A) leading whitespace
B) character return
C) trailing whitespace
D) line feed

Question 9

StringBuilder objects are not immutable.

Question 10

A series of words or other items of data, separated by spaces or other characters, is known as a __________.

A) string
B) token
C) delimiter
D) caption

Question 11

If you are using characters other than whitespaces as delimiters, you will probably want to trim the string before tokenizing; otherwise, the leading and/or following whitespaces will become part of the first and/or last token.

Question 12

A wrapper class is a class that is "wrapped around" a primitive data type and allows you to create objects instead of variables.

Question 13

The term __________ is commonly used to refer to a string that is part of another string.

A) nested string
B) literal
C) substring
D) delimiter

Question 14

If a string has more than one character used as a delimiter, you must write a loop to determine the tokens, one for each delimiter character.

Question 15

When working with the String and StringBuilder classes' getChars method, the character at the start position is included in the substring but the character at the end position is not included.

Question 16

Most of the String comparison methods are case sensitive.

Question 17

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

Question 18

If a non-letter argument is passed to the toLowerCase or toUpperCase method, the boolean value false is returned.

Question 19

Trying to extract more tokens than exist from a StringTokenizer object will cause an error.

Question 20

The String class's regionMatches method performs a case-insensitive comparison.

Question 21

Which of the following statements converts a String object variable named str to an int and stores the value in the variable x?

A) int x = Integer.integer(str);
B) int x - str;
C) int x = Integer.parseInteger(str);
D) int x = Integer.parseInt(str);

Question 22

The no-arg constructor for a StringBuilder object gives the object enough storage space to hold __________ characters.

A) 0
B) 8
C) 16
D) 32

Question 23

The process of breaking a string down into tokens is known as __________.

A) tokenizing
B) buffering
C) simplifying
D) parsing

Question 24

You can concatenate String objects by using the __________.

A) concat or trim methods
B) concat method or the + operator
C) concatenate or join methods
D) concatenate method or the + operator

Question 25

The StringBuilder class's insert method allows you to insert a(n) __________ into the calling object's string.

A) char array
B) primitive type
C) String object
D) All of these

Question 26

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

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

Question 27

The __________ class is the wrapper class for the char data type.

A) StringBuilder
B) Integer
C) Character
D) String

Question 28

The Character wrapper class provides numerous methods for __________.

A) converting objects to primitive data types
B) testing and converting character data
C) testing and converting numeric literals
D) performing operations with named constants

Question 29

Which of the following import statements is required to use the Character wrapper class?

A) import java.String;
B) import java.lang.Char;
C) import java.Char;
D) No import statement is required

Question 30

The __________ method of the String class can be used to tokenize a string.

A) split
B) tokenize
C) trim
D) length

Question 31

The __________ method returns a copy of the calling String object with all leading and trailing whitespace characters deleted.

A) remove
B) trim
C) compress
D) concat

Question 32

When using the String class's trim method, a __________ cannot be trimmed.

A) space
B) tab
C) semicolon
D) newline

Question 33

What will be printed after the following code is executed?
String str = "abc456";
Int m = 0;
While ( m < 6 )
{
If (Character.isLetter(str.charAt(m)))
System.out.print(
Character.toUpperCase(str.charAt(m)));
M++;
}

A) abc456
B) ABC456
C) ABC
D) 456

Question 34

The process of converting a wrapper class object to a primitive type is known as __________.

A) simplifying
B) unboxing
C) parsing
D) devaluating

Question 35

Which of the following statements converts an int variable named number to a string and stores the value in the String object variable named str?

A) String str = Integer.toString(number);
B) String str = number.Integer.toString(str);
C) String str = integer(number);
D) String str = integer.toString(number);

Question 36

The String class's __________ method accepts a value of any primitive data type as its argument and returns a string representation of the value.

A) trim
B) getChar
C) toString
D) valueOf

Question 37

Any ___________ argument passed to the Character class's toLowerCase method or toUpperCase method is returned as it is.

A) nonletter
B) char
C) string
D) static

Question 38

The term used for the character that separates tokens is __________.

A) tokenizer
B) delimiter
C) whitespace
D) separator

Question 39

Which of the following statements will display the maximum value that a double can hold?

A) System.out.println(Double.MAX_VALUE);
B) System.out.println(Double.MAXIMUM_VALUE);
C) System.out.println(Double.MAX_VAL);
D) System.out.println((MAX_VALUE));

Question 40

Autoboxing is __________.

A) Java's process of automatically "boxing up" a value inside an object
B) the automatic allocation of array elements
C) the process of assigning a default value to primitive data types
D) the process of identifying tokens in a string

Question 41

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

A) 14
B) 15
C) 18
D) 17

Question 42

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

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

Question 43

What is the value of str after the following code has been executed?
String str;
String sourceStr = "Hey diddle, diddle, the cat
And the fiddle";
Str = sourceStr.substring(12,17);

A) diddle
B) diddl
C) didd
D) iddle

Question 44

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

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

Question 45

What will be displayed after the following code is executed? String str = "RSTUVWXYZ";
System.out.println(str.charAt(5));

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

Question 46

In the following code, how many times will the for loop execute?
String str = "1,2,3,4,5,6,7,8,9");
String[ ] tokens = str.split(",");
For (String s : tokens)
System.out.println(s);

A) 1
B) 5
C) 7
D) 9

Question 47

What would be the results of executing the following code?
StringBuilder str = new StringBuilder("Little Jack
Horner ");
Str)append("sat on the ");
Str)append("corner");

A) The program would crash.
B) str would reference "Little Jack Horner ".
C) str would reference "Little Jac Horner sat on the ".
D) str would reference "Little Jack Horner sat on the corner".

Question 48

In the following code, how many times will the for loop execute?
String str = ("Ben and Jerry's ice cream is great.");
String[ ] tokens = str.split(" ");
For (String s : tokens)
System.out.println(s);

A) 1
B) 3
C) 5
D) 7

Question 49

What will be displayed after the following code is executed? boolean matches;
String str1 = "The cow jumped over the moon.";
String str2 = "moon";
Matches = str1.endsWith(str1);
System.out.println(matches);

A) true
B) moon
C) false
D) The cow

Question 50

What will be displayed after the following code is executed? StringBuilder strb = new StringBuilder(12);
Strb.append("The cow ");
Strb.append("jumped over the ");
Strb.append("moon.");
System.out.println(strb);

A) The cow
Jumped over the
Moon.
B) The cow jumped over the moon.
C) The cow jump
D) 12The cow jumped over the moon.

Question 51

What will be displayed after the following code is executed?
String str = "abc456";
For (int i = 0; i < str.length(); i++)
{
Char chr = str.CharAt(i);
If (!Character.isLetter(chr))
System.out.print(Character.toUpperCase(chr));
}

A) ABC
B) ABC456
C) 456
D) abc456

Question 52

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

A) 123, 456,7890
B) 123, 456, 7890,-
C) -
D) None of these

Question 53

What are the tokens in the following statement? StringTokenizer st = new StringTokenizer("9-14-2018", "-", true);

A) 9, 14, 2018
B) 9, 14, 2018, -
C) -
D) None of these

Question 54

Which of the following statements will convert the string, str = "285" to an int?

A) int x = str;
B) int x = Integer.parseInteger(str);
C) int x = Integer.integer(str);
D) int x = Integer.parseInt(str);

Question 55

What will be displayed after the following code is executed? String str1 = "The quick brown fox jumped over the lazy dog.";
String str2 = str1.substring(20, 26);
System.out.println(str2);

A) n fox
B) jumped
C) lazy d
D) x jump

Question 56

Given the following, which of the statements below is not true? str.insert(8, 32);

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 57

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);

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

Question 58

Which of the following statements will convert the string, str = "285.74" to a double?

A) double x = str;
B) double x = Double.parseDouble(str);
C) double x = Double.Double(str);
D) double x = str.Double.parseDouble;

Question 59

What will be the value of position after the following code is executed?
int position;
String str = "The cow jumped over the moon.";
Position = str.lastIndexOf("ov", 14);

A) 14
B) 1
C) 0
D) -1

Question 60

Which of the following statements will print the maximum value an int variable may have?

A) System.out.println(MAX_VALUE);
B) System.out.println(integer.MAX_VALUE);
C) System.out.println(Integer.MAX_VALUE);
D) System.out.println(INTEGER.MAX_VALUE);

Question 61

What will be displayed after the following statements are executed? StringBuilder strb = new StringBuilder("We have lived
In Chicago, Trenton, and Atlanta.");
Strb.replace(17, 24, "Tampa");
System.out.println(strb);

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

Question 62

What will be displayed after the following statements are executed? String str = "red$green&blue#orange";
String[ ] tokens = str.split("[$&#]");
For (String s : tokens)
System.out.print(s + " ");

A) red green blue orange
B) red $ green & blue # orange
C) $ & #
D) red[$&#]green[$&#]blue[$&#]orange