Tercer Set de Preguntas Java OCA Exam (1z0-803)

Question 1

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);

Accepted Answer

0 -1 0 1 -1

Answer

1 0 1 0 0

Answer

0 0 0 0 0

Answer

1 0 1 1 -1

Question 2

Which of the following string classes create mutable strings? (Choose all that apply.)

Accepted Answer

StringBuffer

Accepted Answer

StringBuilder

Answer

String

Question 3

Choose the simplest data structure to use to store multiple like variables that could then be accessed by an index.

Accepted Answer

Array

Answer

Primitive

Answer

Object

Answer

Enumeration

Question 4

Which of the statements are correct? (Choose all that apply.)

Accepted Answer

3 is a valid literal for an int.

Accepted Answer

3 is a valid literal for a float.

Accepted Answer

3f is a valid literal for a float.

Answer

3.0 is a valid literal for an int.

Answer

3.0 is a valid literal for a float.

Answer

3f is a valid literal for an int.

Question 5

What literal values are acceptable to use with the boolean primitive?

Accepted Answer

true and false

Answer

true, false, and null

Answer

true, false, TRUE, and FALSE

Answer

TRUE and FALSE

Question 6

Which code segments related to enumerations will result in a compiler error? (Choose all that apply.)

Accepted Answer

enum Coin {penny, nickel, dime, quarter}
Coin coin = Coin.NICKEL;

Answer

enum Coin {PENNY, NICKEL, DIME, QUARTER}
Coin coin = Coin.NICKEL;

Answer

enum Coin {PENNY, NICKEL, DIME, QUARTER}
Coin coin;
coin = Coin.NICKEL;

Answer

enum Coin {PENNY, NICKEL, DIME, QUARTER}
Coin coin = NICKEL;

Question 7

Consider the following declarations. Which declaration has an element name that does not conform to standard naming conventions?

Accepted Answer

Integer IntName;

Answer

static final int varName;

Answer

void getName () {…}

Answer

public class Name {…}

Question 8

Java 7 added the allowance of a special character to indentify places. Which declaration is correct?

Accepted Answer

int investment = 1_000_000;

Answer

int investment = 1x000x000;

Answer

int investment = 1^000^000;

Answer

int investment = 1-000-000;

Question 9

What are the wrapper classes for the primitives boolean, char, short, int, and double?

Accepted Answer

Boolean, Character, Short, Integer, Double

Answer

Boolean, Char, Short , Int , Double

Answer

Boolean, Char, Short, Integer, Double

Answer

Boolean, Character, Short, Int, Double

Question 10

Which of the following statements contain literal values?

Accepted Answer

int maxHorsePower = 170;

Accepted Answer

float idleHorsePower = ((float) currentHorsePower) / 10);

Accepted Answer

System.out.println("Current HP: " + currentHorsePower);

Answer

float currentHorsePower = (float) maxHorsePower;

Question 11

What is the correct way to initialize a variable declared as a Penguin as a new Penguin object?

Accepted Answer

Penguin p = new Penguin();

Answer

Penguin p;

Answer

Penguin p = new Penguin[];

Answer

Penguin p = Penguin();

Question 12

Which of the following are primitive data types? (Choose all that apply.)

Accepted Answer

int

Accepted Answer

boolean

Accepted Answer

char

Answer

Float

Answer

String

Question 13

Which code example makes use of arrays without producing a compiler or runtime error?

Accepted Answer

public class Actor {
String [] characterName = new String[4];
{
characterName[0] = "Captain Video";
characterName[1] = "Quizmaster";
characterName[2] = "J.C. Money";
characterName[3] = "Jersey Joe";
}
}

Answer

public class Actor {
String[] characterName = new String[3];
{
characterName[0] = "Captain Video";
characterName[1] = "Quizmaster";
characterName[2] = "J.C. Money";
characterName[3] = "Jersey Joe";
}
}

Answer

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";
}
}

Answer

public class Actor {
String characterName = new String[4];
{
characterName[0] = "Captain Video";
characterName[1] = "Quizmaster";
characterName[2] = "J.C. Money";
characterName[3] = "Jersey Joe";
}
}

Question 14

Class variables, also known as static fields, have only one instance in existence. Following standing naming conventions, which answer represents a class variable?

Accepted Answer

ClassName.variableName

Answer

variableName

Answer

VariableName

Answer

ClassName:variableName

Question 15

What statement about local variables is true?

Accepted Answer

Local variables are declared inside of methods and are not initialized with a default value.

Answer

Local variables are declared outside of methods and are initialized with a default value.

Answer

Local variables are declared inside of methods and are initialized with a default value.

Answer

Local variables are declared outside of methods and are not initialized with a default value.

Tercer Set de Preguntas Java OCA Exam (1z0-803)

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