Given the following code segment, what would be the output?
int a = 0; int b = 0; int c = 0; System.out.println(a++ + " " + --b + " " + c++ + " " + a + " " + b);
1 0 1 0 0
0 0 0 0 0
1 0 1 1 -1
0 -1 0 1 -1
Which of the following string classes create mutable strings? (Choose all that apply.)
String
StringBuffer
StringBuilder
Choose the simplest data structure to use to store multiple like variables that could then be accessed by an index.
Primitive
Object
Array
Enumeration
Which of the statements are correct? (Choose all that apply.)
3.0 is a valid literal for an int.
3.0 is a valid literal for a float.
3 is a valid literal for an int.
3 is a valid literal for a float.
3f is a valid literal for an int.
3f is a valid literal for a float.
What literal values are acceptable to use with the boolean primitive?
true and false
true, false, and null
true, false, TRUE, and FALSE
TRUE and FALSE
Which code segments related to enumerations will result in a compiler error? (Choose all that apply.)
enum Coin {PENNY, NICKEL, DIME, QUARTER} Coin coin = Coin.NICKEL;
enum Coin {PENNY, NICKEL, DIME, QUARTER} Coin coin; coin = Coin.NICKEL;
enum Coin {PENNY, NICKEL, DIME, QUARTER} Coin coin = NICKEL;
enum Coin {penny, nickel, dime, quarter} Coin coin = Coin.NICKEL;
Consider the following declarations. Which declaration has an element name that does not conform to standard naming conventions?
static final int varName;
Integer IntName;
void getName () {…}
public class Name {…}
Java 7 added the allowance of a special character to indentify places. Which declaration is correct?
int investment = 1x000x000;
int investment = 1_000_000;
int investment = 1^000^000;
int investment = 1-000-000;
What are the wrapper classes for the primitives boolean, char, short, int, and double?
Boolean, Char, Short , Int , Double
Boolean, Char, Short, Integer, Double
Boolean, Character, Short, Int, Double
Boolean, Character, Short, Integer, Double
Which of the following statements contain literal values?
int maxHorsePower = 170;
float currentHorsePower = (float) maxHorsePower;
float idleHorsePower = ((float) currentHorsePower) / 10);
System.out.println("Current HP: " + currentHorsePower);
What is the correct way to initialize a variable declared as a Penguin as a new Penguin object?
Penguin p;
Penguin p = new Penguin();
Penguin p = new Penguin[];
Penguin p = Penguin();
Which of the following are primitive data types? (Choose all that apply.)
int
boolean
char
Float
Which code example makes use of arrays without producing a compiler or runtime error?
public class Actor { String[] characterName = new String[3]; { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
public class Actor { String[] characterName = new String[1..4] { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
public class Actor { String characterName = new String[4]; { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
public class Actor { String [] characterName = new String[4]; { characterName[0] = "Captain Video"; characterName[1] = "Quizmaster"; characterName[2] = "J.C. Money"; characterName[3] = "Jersey Joe"; } }
Class variables, also known as static fields, have only one instance in existence. Following standing naming conventions, which answer represents a class variable?
variableName
VariableName
ClassName:variableName
ClassName.variableName
What statement about local variables is true?
Local variables are declared outside of methods and are initialized with a default value.
Local variables are declared inside of methods and are initialized with a default value.
Local variables are declared outside of methods and are not initialized with a default value.
Local variables are declared inside of methods and are not initialized with a default value.
