Question 1

Given the following declaration: 
StringBuilder buf = new StringBuilder();
What is the capacity of buf?

Accepted Answer

A)  0 
B)  10 
C)  16 
D)  20 
A)  0 
B)  10 
C)  16 
D)  20 C

Question 2

Given the following declarations: 
StringBuilder buf;
StringBuilder buf2 = new StringBuilder();
String c = new String("test");
Which of the following is not a valid StringBuilder constructor?

Accepted Answer

A)  buf = new StringBuilder(); 
B)  buf = new StringBuilder(buf2, 32); 
C)  buf = new StringBuilder(32); 
D)  buf = new StringBuilder(c); 
A)  buf = new StringBuilder(); 
B)  buf = new StringBuilder(buf2, 32); 
C)  buf = new StringBuilder(32); 
D)  buf = new StringBuilder(c); B

Question 3

Consider the Java segment: 
String line1 = new String("c = 1 + 2 + 3") ;
StringTokenizer tok = new StringTokenizer(line1, delimArg);
For the String line1 to have 4 tokens, delimArg should be:

Accepted Answer

A)  String delimArg = "+="; 
B)  String delimArg = "123" 
C)  String delimArg = "c+"; 
D)  String delimArg = " "; 
A)  String delimArg = "+="; 
B)  String delimArg = "123" 
C)  String delimArg = "c+"; 
D)  String delimArg = " "; A

Question 4

Which of the following statements is true?

Accepted Answer

A)  Ranges of characters can be represented by placing a ~ between two characters. 
B)  [^Z] is the same as [A~Y]. 
C)  Both "A*" and "A+" will match "AAA", but only "A*" will match an empty string. 
D)  All of above. 
A)  Ranges of characters can be represented by placing a ~ between two characters. 
B)  [^Z] is the same as [A~Y]. 
C)  Both "A*" and "A+" will match "AAA", but only "A*" will match an empty string. 
D)  All of above.

Question 5

Which of the following are static Character methods?

Accepted Answer

A)  Character.hashcode(char c); 
B)  Character.isDigit(char c); 
C)  Character.equals(char c); 
D)  All of the above. 
A)  Character.hashcode(char c); 
B)  Character.isDigit(char c); 
C)  Character.equals(char c); 
D)  All of the above.

Question 6

Consider the examples below: 
A. a string.
B. 'a string'.
C. "a string".
D. "1234".
E. integer.
Which could be the value of a Java variable of type String?

Accepted Answer

A)  A and B. 
B)  B and E. 
C)  B and C. 
D)  C and D. 
A)  A and B. 
B)  B and E. 
C)  B and C. 
D)  C and D.

Question 7

The statement 
s1.startsWith("art")
Has the same result as which of the following?

Accepted Answer

A)  s1.regionMatches(0, "art", 0, 3); 
B)  s2 = s1.getChars(0, 3); s2.equals("art"); 
C)  s1.regionMatches(true, 0, "art", 0, 3); 
D)  All of the above 
A)  s1.regionMatches(0, "art", 0, 3); 
B)  s2 = s1.getChars(0, 3); s2.equals("art"); 
C)  s1.regionMatches(true, 0, "art", 0, 3); 
D)  All of the above

Question 8

The length of a string can be determined by ________.

Accepted Answer

A)  the String method length() 
B)  the String instance variable length 
C)  the String method strlen() 
D)  All of the above. 
A)  the String method length() 
B)  the String instance variable length 
C)  the String method strlen() 
D)  All of the above.

Question 9

A String constructor cannot be passed ________.

Accepted Answer

A)  char arrays. 
B)  int arrays. 
C)  byte arrays. 
D)  Strings. 
A)  char arrays. 
B)  int arrays. 
C)  byte arrays. 
D)  Strings.

Question 10

The statement
 s1.equalsIgnoreCase(s4)
Is equivalent to which of the following?

Accepted Answer

A)  s1.regionMatches(true, 0, s4, 0, s4.length()); 
B)  s1.regionMatches(0, s4, 0, s4.length()); 
C)  s1.regionMatches(0, s4, 0, s4.length); 
D)  s1.regionMatches(true, s4, 0, s4.length); 
A)  s1.regionMatches(true, 0, s4, 0, s4.length()); 
B)  s1.regionMatches(0, s4, 0, s4.length()); 
C)  s1.regionMatches(0, s4, 0, s4.length); 
D)  s1.regionMatches(true, s4, 0, s4.length);

Question 11

Consider the statement below: 
StringBuilder sb1 = new StringBuilder("a toyota");
Which of the following creates a String object with the value "toy"?

Accepted Answer

A)  String res = sb1.subString(2, 5); 
B)  char dest[] = new char[sb1.length()]; sb1.getChars(2, 5, dest, 0);
String res = new String(dest); 
C)  char dest[] = new char[sb1.length]; dest = sb1.getChars(2, 5);
String res = new String(dest); 
D)  char dest[] = new char[sb1.length()]; dest = sb1.getChars(0, 3);
String res = new String(dest); 
A)  String res = sb1.subString(2, 5); 
B)  char dest[] = new char[sb1.length()]; sb1.getChars(2, 5, dest, 0);
String res = new String(dest); 
C)  char dest[] = new char[sb1.length]; dest = sb1.getChars(2, 5);
String res = new String(dest); 
D)  char dest[] = new char[sb1.length()]; dest = sb1.getChars(0, 3);
String res = new String(dest);

Question 12

Which class is not a type-wrapper class?

Accepted Answer

A)  Character 
B)  Int 
C)  Double 
D)  Byte 
A)  Character 
B)  Int 
C)  Double 
D)  Byte

Question 13

Consider the statements below: 
StringBuilder sb = new StringBuilder("a toyota");
Sb)insert(2, "landrover");
Sb)delete(11, 16);
Sb)insert(11, " ");
The StringBuilder contents at the end of this segment will be ________.

Accepted Answer

A)  a landrovertoyota 
B)  a landrover a 
C)  a landrov a 
D)  a landrover toy a 
A)  a landrovertoyota 
B)  a landrover a 
C)  a landrov a 
D)  a landrover toy a

Question 14

An anonymous String ________.

Accepted Answer

A)  has no value 
B)  is a string literal 
C)  can be changed 
D)  none of the above 
A)  has no value 
B)  is a string literal 
C)  can be changed 
D)  none of the above

Question 15

Consider the Java segment: 
String line1 = new String("c = 1 + 2 + 3") ;
StringTokenizer tok = new StringTokenizer(line1, "+=");
String foo = tok.nextToken();
String bar = tok.nextToken();
The values of foo and bar are:

Accepted Answer

A)  foo is "c ", bar is " = ". 
B)  foo is "c", bar is " ". 
C)  foo is " = ", bar is " + ". 
D)  foo is "c ", bar is " 1 ". 
A)  foo is "c ", bar is " = ". 
B)  foo is "c", bar is " ". 
C)  foo is " = ", bar is " + ". 
D)  foo is "c ", bar is " 1 ".

Question 16

To find the character at a certain index position within a String, use the method ________.

Accepted Answer

A)  getChars, with the index as an argument 
B)  getCharAt, with the index as an argument 
C)  charAt, with the index as an argument 
D)  charAt, with the character you are searching for as an argument 
A)  getChars, with the index as an argument 
B)  getCharAt, with the index as an argument 
C)  charAt, with the index as an argument 
D)  charAt, with the character you are searching for as an argument

Question 17

StringBuilder objects can be used in place of String objects if ________.

Accepted Answer

A)  the string data is not constant 
B)  the string data size may grow 
C)  the programs frequently perform string concatenation 
D)  All of the above. 
A)  the string data is not constant 
B)  the string data size may grow 
C)  the programs frequently perform string concatenation 
D)  All of the above.

Question 18

Given the following declarations: 
StringBuilder buffer = new StringBuilder("Testing Testing");
Buffer.setLength(7);
Buffer.ensureCapacity(5);
Which of the following is true?

Accepted Answer

A)  buffer has capacity 5. 
B)  buffer has capacity 31. 
C)  buffer has content "Testin". 
D)  buffer has length 15. 
A)  buffer has capacity 5. 
B)  buffer has capacity 31. 
C)  buffer has content "Testin". 
D)  buffer has length 15.

Question 19

Which of the following is not a method of class String?

Accepted Answer

A)  toUpperCase 
B)  trim 
C)  toCharacterArray 
D)  All of the above are methods of class String 
A)  toUpperCase 
B)  trim 
C)  toCharacterArray 
D)  All of the above are methods of class String

Question 20

Which of the following statements is true?

Accepted Answer

A)  The capacity of a StringBuilder is equal to its length. 
B)  The capacity of a StringBuilder cannot exceed its length. 
C)  The length of a StringBuilder cannot exceed its capacity. 
D)  Both a and b are true. 
A)  The capacity of a StringBuilder is equal to its length. 
B)  The capacity of a StringBuilder cannot exceed its length. 
C)  The length of a StringBuilder cannot exceed its capacity. 
D)  Both a and b are true.

Exam 14: Strings, Characters and Regular Expressions

Given the following declaration: StringBuilder buf = new StringBuilder(); What is the capacity of buf?

Given the following declarations: StringBuilder buf; StringBuilder buf2 = new StringBuilder(); String c = new String("test"); Which of the following is not a valid StringBuilder constructor?

Consider the Java segment: String line1 = new String("c = 1 + 2 + 3") ; StringTokenizer tok = new StringTokenizer(line1, delimArg); For the String line1 to have 4 tokens, delimArg should be:

Which of the following statements is true?

Which of the following are static Character methods?

Consider the examples below: A. a string. B. 'a string'. C. "a string". D. "1234". E. integer. Which could be the value of a Java variable of type String?

The statement s1.startsWith("art") Has the same result as which of the following?

The length of a string can be determined by ________.

A String constructor cannot be passed ________.

The statement s1.equalsIgnoreCase(s4) Is equivalent to which of the following?

Consider the statement below: StringBuilder sb1 = new StringBuilder("a toyota"); Which of the following creates a String object with the value "toy"?

Which class is not a type-wrapper class?

Consider the statements below: StringBuilder sb = new StringBuilder("a toyota"); Sb)insert(2, "landrover"); Sb)delete(11, 16); Sb)insert(11, " "); The StringBuilder contents at the end of this segment will be ________.

An anonymous String ________.

Consider the Java segment: String line1 = new String("c = 1 + 2 + 3") ; StringTokenizer tok = new StringTokenizer(line1, "+="); String foo = tok.nextToken(); String bar = tok.nextToken(); The values of foo and bar are:

To find the character at a certain index position within a String, use the method ________.

StringBuilder objects can be used in place of String objects if ________.

Given the following declarations: StringBuilder buffer = new StringBuilder("Testing Testing"); Buffer.setLength(7); Buffer.ensureCapacity(5); Which of the following is true?

Which of the following is not a method of class String?

Which of the following statements is true?

Introduction to Computers, the Internet and Java

Introduction to Java Applications; Inputoutput and Operators

Introduction to Classes, Objects, Methods and Strings

Control Statements: Assignment, and Operators

Control Statements: Logical Operators

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism and Interfaces

Exception Handling: a Deeper Look

Javafx Graphical User Interfaces

Javafx Gui

Files, Inputoutput Streams, Nio and Xml Serialization

Generic Collections

Lambdas and Streams

Recursion

Searching, Sorting and Big O

Generic Classes and Methods: a Deeper Look

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

Swing Gui Components

Graphics and Java 2d

Networking

Java Persistence Api Jpa

Javaserver Faces Web Apps

Javaserver Faces Web Apps

Swing Gui Components

Filters