Question 1

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 B

Question 2

How many String objects are instantiated by the following code segment (not including the literals)?
String s1, output;
S1 = "hello";
Output = "
The string reversed is: " ;
For (int i = s1.length() - 1; i >= 0; i--)
Output += s1.charAt(i) + " " ;

Accepted Answer

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

Question 3

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. D

Question 4

Consider the String below:
String r = "a toyota";
Which of the following will create the String r1 = "a TOYOTa"?

Accepted Answer

A)  String r1 = r.replace("toyot", TOYOT"); 
B)  String r1 = r.replace('t','T'); r1 = r.replace('o','0');
R1 = r.replace('y','Y'); 
C)  String r1 = r.replace('t','T').replace('o', '0').replace('y', 'Y'); 
D)  String r1 = r.substring(2, 4).toUpperCase(); 
A)  String r1 = r.replace("toyot", TOYOT"); 
B)  String r1 = r.replace('t','T'); r1 = r.replace('o','0');
R1 = r.replace('y','Y'); 
C)  String r1 = r.replace('t','T').replace('o', '0').replace('y', 'Y'); 
D)  String r1 = r.substring(2, 4).toUpperCase();

Question 5

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 6

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 7

String objects are immutable. This means they ________.

Accepted Answer

A)  must be initialized 
B)  cannot be deleted 
C)  cannot be changed 
D)  None of the abov 
A)  must be initialized 
B)  cannot be deleted 
C)  cannot be changed 
D)  None of the abov

Question 8

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 9

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 = " ";

Question 10

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 11

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.

Question 12

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 13

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 14

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

Question 15

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 16

Which of the following creates the string of the numbers from 1 to 1000 most efficiently?

Accepted Answer

A)  String s; for (int i = 1; i <= 1000; i++)
S += i; 
B)  StringBuilder sb = new StringBuilder(10); for (int i = 1; i <= 1000; i++)
Sb)append(i);
String s = new String(sb); 
C)  StringBuilder sb = new StringBuilder(3000); for (int i = 1; i <= 1000; i++)
Sb)append(i);
String s = new String(sb); 
D)  All are equivalently efficient. 
A)  String s; for (int i = 1; i <= 1000; i++)
S += i; 
B)  StringBuilder sb = new StringBuilder(10); for (int i = 1; i <= 1000; i++)
Sb)append(i);
String s = new String(sb); 
C)  StringBuilder sb = new StringBuilder(3000); for (int i = 1; i <= 1000; i++)
Sb)append(i);
String s = new String(sb); 
D)  All are equivalently efficient.

Question 17

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 18

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 19

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 20

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);

Exam 14: Fundamentals of Characters and Strings

Which class is not a type-wrapper class?

How many String objects are instantiated by the following code segment (not including the literals)? String s1, output; S1 = "hello"; Output = "\nThe string reversed is: " ; For (int i = s1.length() - 1; i >= 0; i--) Output += s1.charAt(i) + " " ;

Which of the following statements is true?

Consider the String below: String r = "a toyota"; Which of the following will create the String r1 = "a TOYOTa"?

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

The statement S1)equalsIgnoreCase(s4) Is equivalent to which of the following?

String objects are immutable. This means they ________.

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 ________.

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:

An anonymous String ________.

Which of the following statements is true?

The statement S1)startsWith("art") Has the same result as which of the following?

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?

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

Which of the following are static Character methods?

Which of the following creates the string of the numbers from 1 to 1000 most efficiently?

The length of a string can be determined by ________.

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

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

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?

Introduction to Computers and Java

Introduction to Java Applications

Control Statements

Control Statements

Methods

Arrays and Arraylists

Introduction to Classes and Objects

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Gui Components

Graphics and Java 2D

Files, Streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

GUI

Concurrency

Accessing Databases With JDBC

JavaFX

Filters