Deck 10: Text Processing and More About Wrapper Classes

Question 1

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

Answer 1

D

Question 2

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);

Answer 2

A

Question 3

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

Answer 3

C

Question 4

What will be the tokens in the following statement? StringTokenizer strToken = new StringTokenizer("123-456-7890",
"-",true);

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

Question 5

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 6

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 7

In a string that contains a series of words or other items of data separated by spaces or other characters,the programming term for the spaces or other characters is

A) token
B) delimiter
C) buffer
D) separator

Question 8

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 9

The StringBuilder constructor used in the following statement will... StringBuilder str = new StringBuilder(25);

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 10

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 11

To use the StringTokenizer class you must have the following import statement.

A) import java.util.StringTokenizer;
B) import java.util.String;
C) import java.StringTokenizer;
D) import java.String;

Question 12

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 13

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 14

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 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");

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

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 17

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 18

For the following code,how many times would the while loop execute? StringTokenizer strToken =
New StringTokenizer("Cars,trucks,and SUVs " +
"are all types of automobiles.");
While (strToken.hasMoreTokens())
{
System.out.println(strToken.nextToken());
}

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

Question 19

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 20

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 21

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 22

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 23

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 24

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 25

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 26

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 27

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 28

For the following code,how many times would the while loop execute? StringTokenizer strToken =
New StringTokenizer("Ben and Jerry's ice cream is great.");
While (strToken.hasMoreTokens())
{
System.out.println(strToken.nextToken());
}

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

Question 29

If you do not specify delimiters in the StringToken constructor,which of the following cannot be a delimiter?

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

Question 30

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 31

In a string that contains a series of words or other items of data separated by spaces or other characters,the programming term for the data items is

A) token
B) delimiter
C) buffer
D) separator

Question 32

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 33

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 34

What will be the tokens in the following statement? StringTokenizer strToken =
New StringTokenizer("January 1,2008",",",true);

A) The tokens will be:
January,1
2008
B) The tokens will be
,
Space
C) The tokens will be:
January
1
2008
Space
D) The tokens will be:
January
Space
1
,
Space
2008

Question 35

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 36

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 37

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 38

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 39

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

Question 40

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 41

StringBuilder objects are immutable.

Question 42

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

Question 43

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

Question 44

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

Question 45

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 46

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

Question 47

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 48

You cannot assign a value to a wrapper class object.

Question 49

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.