Deck 8: Text Processing and Wrapper Classes

Question 1

The StringBuilder class's insert method allows you to insert into the calling object's string

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

Answer 1

D

Question 2

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);

Answer 2

A

Question 3

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

Answer 3

C

Question 4

Which of the following statements is not true about the following code?
StringBuilder strb =
New StringBuilder("Total number of parts: ");
Strb.insert(23, 32);

A) The starting position for the insert is 23.
B) strb is a StringBuilder type object.
C) The ending position for the insert is 32.
D) The literal number 32 will be inserted into the string.

Question 5

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 6

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 7

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 8

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

A) import java.util.Scanner
B) import java.text.DecimalFormat;
C) import java.util.StringTokenizer;
D) import javax.swing.JOptionPane;

Question 9

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 10

A series of words or other items of data separated by spaces or other characters are known as

A) strings.
B) tokens.
C) delimiters.
D) captions.

Question 11

Which of the following are used as delimiters if the StringTokenizer class's constructor is called and a reference to a String object is passed as the only argument?

A) space
B) tab
C) newline
D) All of the above

Question 12

What will be the tokens in the following statement?
StringTokenizer st =
New StringTokenizer("9-14-2014", "-", true);

A) 9, 14, and 2014
B) 9, 14, 2014, and -
C) -
D) None of the above

Question 13

Which of the following statements converts a double variable named tax to a string and stores the value in the String object variable named str?

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

Question 14

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 15

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 16

What will be displayed after the following code has been 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 17

For the following code, how many times would the while loop execute?
StringTokenizer st =
New StringTokenizer("Java programming is fun!");
While (st.hasMoreTokens())
System.out.println(st.nextToken());

A) 7
B) 4
C) 5
D) 1

Question 18

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 19

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

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

Question 20

The ________ method returns a copy of the calling String object, in which all leading and trailing whitespace characters have been deleted.

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

Question 21

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

Question 22

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 23

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

Question 24

StringBuilder objects are not immutable.

Question 25

You can concatenate String objects by

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

Question 26

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

Question 27

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

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

Question 28

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

Question 29

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

Question 30

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 31

You will cause an off-by-one error, when working with a character position within a string, if you think of the first position in a string as 1.

Question 32

Most of the String comparison methods are case sensitive.

Question 33

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

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

Question 34

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

Question 35

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 needed

Question 36

You cannot assign a value to a wrapper class object.

Question 37

What will be displayed after the following statements are 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 38

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

Question 39

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 40

In the ________ file format, when the data in a spreadsheet is exported, each row is written to a line, and the values in the cells are separated by commas.

A) comma separated value
B) extensible markup language
C) excel binary
D) data interchange