Question 1

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);

Accepted Answer

A)  diddle 
B)  diddl 
C)  ,didd 
D)  Iddle

Question 2

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.

Accepted Answer

A) True 
 B)False

Question 3

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

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

You cannot assign a value to a wrapper class object.

Accepted Answer

A) True 
 B)False

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 data items is

Accepted Answer

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++;
}

Accepted Answer

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

Question 9

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 10

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.

Accepted Answer

A) True 
 B)False

Question 11

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());
}

Accepted Answer

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

Question 12

The Character wrapper class provides numerous methods for

Accepted Answer

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

Question 13

StringBuilder objects are immutable.

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

Question 15

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

Accepted Answer

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 16

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

Accepted Answer

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 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

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

Question 20

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

Accepted Answer

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

Exam 10: Text Processing and More About Wrapper Classes

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) ;

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.

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

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

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

You cannot assign a value to a wrapper class object.

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

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++; }

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

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.

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() ) ; }

The Character wrapper class provides numerous methods for

StringBuilder objects are immutable.

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

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

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

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

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

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

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