Question 1

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

Accepted Answer

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. 
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. C

Question 2

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

Accepted Answer

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

Question 3

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");

Accepted Answer

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. 
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. A

Question 4

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.

Accepted Answer

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

Question 5

Two ways of concatenating two Strings are

Accepted Answer

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 
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 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");

Accepted Answer

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". 
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

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

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

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

Question 9

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);

Accepted Answer

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

Question 10

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

Accepted Answer

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 
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 11

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

Accepted Answer

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

Question 12

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

Accepted Answer

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 
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 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

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

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

A)  System.out.println(MAX_VALU
E) ; 
B)  System.out.println(double.MAX_VALU
E) ; 
C)  System.out.println(Double.MAX_VALU
E) ; 
D)  System.out.println(Double.MAXIMUM_VALU
E) ; 
A)  System.out.println(MAX_VALU
E) ; 
B)  System.out.println(double.MAX_VALU
E) ; 
C)  System.out.println(Double.MAX_VALU
E) ; 
D)  System.out.println(Double.MAXIMUM_VALU
E) ;

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Use the following import statement when using the Character wrapper class

Accepted Answer

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

Exam 10: Text Processing and More About Wrapper Classes

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

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

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");

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.

Two ways of concatenating two Strings are

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");

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

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

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);

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

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

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

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

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

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++; }

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

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

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

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

Use the following import statement when using the Character wrapper class

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

A First Look at Gui Applications

Arrays and the Arraylist Class

A Second Look at Classes and Objects

Inheritance

Exceptions and Advanced File Io

Advanced Gui Applications

Applets and More

Recursion

Sorting, Searching, and Algorithm Analysis

Generics

Collections

Array-Based Lists

Linked Lists

Stacks and Queues

Binary Trees, Avl Trees, and Priority Queues

Filters