Deck 9: Text Processing and More About Wrapper Classes

Question 1

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".

Answer 1

D

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:

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

Answer 2

C

Question 3

Which of the following methods of the String class can be used to tokenize a string?

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

Answer 3

A

Question 4

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 5

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

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

Question 6

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

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

Question 7

When you are writing a program with String objects that may have unwanted spaces at the beginning or end of the strings, use this method to delete them.

A) replace
B) trim
C) valueOf
D) substring

Question 8

Sometimes a string will contain a series of words or other items of data separated by spaces or other characters. In programming terms, items such as these are known as what?

A) Tokens
B) Delimiters
C) Key characters
D) Lists

Question 9

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

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

Question 10

What is the term used for the character that separates tokens?

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

Question 11

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 12

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

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

Question 13

Look at the following statement: StringBuilder str = new StringBuilder(25);
What will the StringBuilder constructor do?

A) give the object, str, 25 bytes of storage and store spaces in them
B) give the object, str, 25 bytes of storage and not store anything in them
C) give the object, str, 25 or more bytes of storage and store spaces in them
D) give the object, str, 0 bytes of storage

Question 14

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");

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

Question 15

The Character wrapper class provides numerous methods for:

A) testing String objects
B) testing and converting char variables
C) converting String variables
D) adding two char variables

Question 16

What is 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 17

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");

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 18

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

Question 19

The process of breaking a string down into tokens is known as what?

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

Question 20

This character is one that appears at the end, or right side, of a string, after the non-space characters:

A) Leading whitespace
B) Carriage return
C) Trailing whitespace
D) Line feed

Question 21

For the following code, how many times would 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 22

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

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

Question 23

This is the process of converting a wrapper class object to a primitive type.

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

Question 24

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 25

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.");

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 26

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

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

Question 27

Given the following statement, which of the following 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 28

Two ways of concatenating two Strings are:

A) Use the concat() method or use the + between the two Strings
B) Use the concatenate() method or use the + between the two Strings
C) Use the contenate() method or the concat() method
D) Use the concat() method or the trim() method

Question 29

For the following code, how many times would 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 30

What will be the tokens given the following statements?
String str = ("January 1, 2016");
String[] tokens = str.split(" ");

A) The tokens will be: January
1,
2016
B) The tokens will be: ,
Space
C) The tokens will be: January
1
2016
Space
D) The tokens will be: January
Space
1
,
Space
2016

Question 31

When using the String class's trim method, which of the following cannot be trimmed?

A) Space
B) Tab
C) Semicolon
D) Newline

Question 32

To convert the string, str = "285.74" to a double, use the following statement:

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

Question 33

Use the following import statement when using the Character wrapper class:

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

Question 34

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

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 35

Which of the following statements will print the maximum value a double variable may have?

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

Question 36

To convert the int variable, number to a string, use the following statement:

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

Question 37

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) 456
B) ABC456
C) ABC
D) abc456

Question 38

What will be the value of matches after the following code has been executed?
Boolean matches;
String str1 = "The cow jumped over the moon.";
String str2 = "moon";
Matches = str1.endsWith(str2);

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

Question 39

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.lastIndexOf("ov", 14);

A) 15
B) 16
C) 0
D) -1

Question 40

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 41

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

Question 42

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

Question 43

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 44

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

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

Question 45

Look at the following code. Integer myNumber;
MyNumber = 5;
Which of the following is TRUE about the second statement?

A) It results in an error because you cannot assign a primitive type to a wrapper class object.
B) The statement performs autoboxing.
C) The statement performs unboxing.
D) The statement performs autowrapping.

Question 46

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 47

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

Question 48

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

Question 49

The following statement correctly creates a StringBuilder object.
StringBuilder str = "Caesar Salad";

Question 50

You cannot assign a value to a wrapper class object.

Question 51

Autoboxing is:

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

Question 52

Look at the following code: Integer myNumber = new Integer(5);
Int var = myNumber;
Which of the following is TRUE about the second statement?

A) It results in an error because you cannot assign a wrapper class object to a primitive variable.
B) The statement performs autoboxing.
C) The statement performs unboxing.
D) The statement performs unwrapping.

Question 53

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

Question 54

To convert the string, str = "285" to an int, use the following statement:

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 the tokens in the following statement?
String str = "red$green&blue#orange";
String[] tokens = str.split("[$&#]");

A) "red", "green", "blue", and "orange"
B) "$", "&", and "#"
C) "[", "$", "&", "#", and "]"
D) None of the above

Question 56

StringBuilder objects are immutable.

Question 57

To convert the double variable, d = 543.98, to a string, use the following statement:

A) String str = Double.toString(d);
B) String str = double.toString(d);
C) String str = double(d);
D) String str = d.Double.toString(str);

Question 58

The String class's valueOf() method accepts a value of any primitive data type as an argument and returns a string representation of the value.

Question 59

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

Question 60

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