Midterm Reviewer Flashcards
1
Q
A component of a program that knows how to perform methods and interact with other objects.
A
Object
2
Q
Does not occupy any memory space and is only a logical representation of data.
A
Class
3
Q
How is an object created?
A
An object is created when a class is instantiated.
4
Q
Java Virtual Machine executes much faster. To which Java characteristic does this pertain?
A
High-Performance
5
Q
Complete date when JDK (Java Development Kit) 1.0 was released.
A
January 23, 1996
6
Q
A reserved area in memory that holds a value which can be changed while the program is being executed
A
Variable
7
Q
Created using defined constructors of classes and used to access objects.
A
Reference Data Types
8
Q
A block of code similar to a method and is called when an instance of class is created.
A
Constructor
9
Q
A collection of statements grouped together to perform an operation.
A
Method
10
Q
A type of constructor wherein the signature is the same with the default constructor, but the body may have code/statements.
A
No-argument Constructor
11
Q
What is the output of the following code?
public class MainClass {
public static void main(String[] args) {
char letter = 65;
System.out.println(“Letter is “ + letter);
}
}
A
Error
12
Q
What is the output of the following code?
public class MainClass {
public static void main(String[] args) {
int number= 50;
char letter= ‘w’;
System.out.print(number);
System.out.print(letter);
}
}
A
50w
13
Q
Variables, methods and constructors which are declared public can be accessed by any class (True or False)
A
TRUE
14
Q
Variables defined inside methods, constructors or blocks.
A
Class Variable
15
Q
Keywords and identifiers can be used as variable names in Java (True or False)
A
FALSE
16
Q
What is the output of the following code?
public class SampleClass {
public static void main(String args[])
{
int g = 3;
System.out.print(++g * 8);
}
}
A
32
17
Q
Which of the following is not a use of the this keyword in Java?
A. Passing itself to the method of the same class.
B. Passing itself to another method.
C. Referring to the instance variable when a local variable has the same name.
D. Calling another constructor in constructor chaining
A
A
18
Q
What is the output of the following code?
public class Square
{
int width;
int height;
int length;
}
public class MainClass
{
public static void main(String args[])
{
Square s = new Square();
s.width = 10;
s.height = 2;
s.length = 10;
int box = obj.width * obj.height * obj.length;
System.out.print(box);
}
}
A
200
19
Q
What is the output of the following code?
public class MainClass
{
public static void main(String args[])
{
int series[] = {1, 2, 3, 4, 5};
for ( int num = 0; num < series.length - 2; ++num)
System.out.println(series[num] + " ");
}
}
A
1 2 3
20
Q
What is the output of the following code?
public class RecurClass
{
int recur(int num)
{
int result = 0;
if (num == 1)
return 1;
result = recur(num - 1);
return result;
}
}
public class MainClass
{
public static void main(String args[])
{
RecurClass r = new RecurClass() ;
System.out.print(r.recur(10));
}
}
A
1
21
Q
What is the output of the following code?
public class SampleClass {
final int number = 100;
public static void main(String[] args) {
System.out.println(“Number is “ + number);
}
}
A
ERROR
22
Q
What is the output of the following code?
public class SampleClass {
public static void main(String[] args){
boolean firstBool = true;
boolean secondBool = true;
if(b1 == b2){
System.out.print("Domain");
}
if(b1.equals(b2)){
System.out.print("Expansion");
}
}
}
A
ERROR
23
Q
What is the output of the following code?
public class SampleClass{
public static void main(String[] args) {
byte firstByte = 150, secondByte = 30;
byte thirdByte = firstByte / secondByte;
System.out.println("Result is " + thirdByte);
} }
A
ERROR
24
Q
What is the output of the following code?
public class SampleClass{
public static void main(String[] args){
int try = 2;
for(int count = 0; count < try; count++){
System.out.print("Value of count is " + i + ". ");
}
} }
A
ERROR
25
What is the output of the following code?
class PrintClass{
public PrintClass(double num){
System.out.print("First Constructor");
}
public PrintClass(float num){
System.out.print("Second Constructor");
}
}
public class SampleClass{
public static void main(String[] args){
int longNum = 20;
PrintClass pc = new PrintClass(longNum);
}
}
Second Constructor
26
What is the output of the following code?
class CharCheckerClass{
public CharCheckerClass(int num){
System.out.print("Number Constructor");
}
public CharCheckerClass(char charac){
System.out.print("Char Constructor");
}
void CharCheckerClass(String string){
System.out.print("String Constructor");
}
}
public class SampleClass{
public static void main(String[] args){
String charac = "c";
CharCheckerClass one = new CharCheckerClass(charac);
}
}
ERROR
27
What is the output of the following code?
class CheckerClass{
public CheckerClass(int i){
System.out.println("This is an integer.");
}
public void CheckerClass(short s){
System.out.println("This is a short.");
}
}
public class SampleClass{
public static void main(String[] args){
short shorty = 100;
CheckerClass one = new CheckerClass(shorty);
}
}
This is an integer.
28
What is the output of the following code?
package ClassPackage;
class FirstClass{
public FirstClass(){
System.out.print("One");
}
}
class SecondClass{
public SecondClass(){
System.out.print("Two");
}
}
class ThreeClass{
public ThreeClass(){
System.out.print("Three");
}
}
public class SampleClass{
static FirstClass first = new FirstClass();
SecondClass second = new SecondClass();
static ThreeClass third = new ThreeClass();
public static void main(String[] args) {
System.out.print("Hello");
SampleClass sample = new SampleClass();
}
}
OneThreeHelloTwo
29
What is the output of the following code?
public class SampleClass{
public static void main(String[] args){
int number = 97;
switch(number){
case 95 :
System.out.print("First ");
case 96 :
System.out.print("Second ");
case 'a' :
System.out.print("Third ");
case 'b' :
System.out.print("Fourth ");
case 'c' :
System.out.print("Fifth ");
}
}
}
Third Fourth Fifth
30
What is the output of the following code?
public class SampleClass{
public static void main(String[] args){
int number1 = 0;
while(number1 + 2 < 50){
number1 += 2;
int number2 = 50;
while(number2 - 2 > 0){
number2 -= 2;
}
}
System.out.println(number1 + " " + number2);
}
}
Error
31
What is the output of the following code?
public class SampleClass{
public static void main(String[] args){
int counter = 561;
if(counter < 2000){
String stringy = "Lesser than the number.";
}else{
String stringy = "Greater than the number.";
}
System.out.println(stringy);
}
}
ERROR
32
What is the output of the following code?
class ObjectClass{
void ObjectClass(){
System.out.println("Instantiation complete.");
}
}
public class SampleClass{
public static void main(String[] args){
ObjectClass one = new ObjectClass();
}
}
No output
33
What is the output of the following code?
public class SampleClass{
public static void main(String[] args){
for(int num1 = 0; num1 < 3; num1++){
for(int num2 = 0; num2 < 3; num2++){
if(num1 == num2)
continue;
System.out.print(num1 + " " + num2 + ", ");
}
}
}
}
0 1, 0 2, 1 0, 1 2, 2 0, 2 1,
34
What is the output of the following code?
public class SampleClass{
public static void main(String[] args){
for(int number = 0 ; number < 5 ; number++)
System.out.println(number + " ");
System.out.println(number + " ");
}
}
ERROR
35
What is the output of the following code?
public class SampleClass{
static String stringy = "false";
public static void main(String[] args) {
if(stringy == false)
System.out.println("Nothing to see here.");
}
}
ERROR
36
What is the output of the following code?
class Hero {
public void smash() { System.out.println("Detroit Smash!"); }
}
class Student extends Hero {
private void smash() { System.out.println("Practice Smash!"); }
}
public class SampleClass {
public static void main(String args[]) {
Hero deku = new Student();
deku.smash();
}
}
Compile-time Error
37
What is the output of the following code?
class Hero {
private void smash() { System.out.println("Detroit Smash!"); }
}
class Student extends Hero {
public void smash() { System.out.println("Practice Smash!"); }
}
public class SampleClass {
public static void main(String args[]) {
Hero deku = new Student();
deku.smash();
}
}
Compile-time Error
38
What is the output of the following code?
class Kage {
public void fight() {
System.out.println("Flying Raijin!");
}
}
class Jonin extends Kage {
public void fight() {
System.out.println("Rasengan!");
}
}
class Shinobi extends Jonin {
public void fight() {
super.super.fight();
System.out.println("Shadow Clone Technique!");
}
}
public class SampleClass {
public static void main(String[] args) {
Shinobi ninja = new Shinobi();
ninja.fight();
}
}
Compile-time Error
39
What is the output of the following code?
class Kage {
public void fight() {
System.out.println("Flying Raijin!");
}
}
class Jonin extends Kage {
public void fight() {
System.out.println("Rasengan!");
}
}
class Shinobi extends Jonin {
public void fight() {
super.fight();
System.out.println("Shadow Clone Technique!");
}
}
public class SampleClass {
public static void main(String[] args) {
Shinobi ninja = new Shinobi();
ninja.fight();
}
}
Rasengan!
Shadow Clone Technique!
40
What is the output of the following code?
final class DifficultClass {
private final double num1;
private final double num2;
public DifficultClass(double num2, double num1) {
this.num1 = num2;
this.num2 = num1;
}
public String printLine() {
return "" + num2 + " + " + num1 + ".";
}
}
public class SampleClass {
public static void main(String args[])
{
DifficultClass c = new DifficultClass(150, 270);
System.out.println("Numbers are " + c.printLine());
}
}
Numbers are 270.0 + 150.0.
41
What is the output of the following code?
class MoreDifficultClass {
public MoreDifficultClass() {
System.out.println("Let's make it challenging.");
}
public MoreDifficultClass(int num1) {
System.out.println("Print Here!");
}
}
class DifficultClass extends MoreDifficultClass {
private final double num1;
private final double num2;
public DifficultClass(double num2, double num1) {
this.num1 = num2;
this.num2 = num1;
}
public String printLine() {
return "" + num2 + " + " + num1 + ".";
}
}
public class SampleClass {
public static void main(String args[])
{
DifficultClass c = new DifficultClass(150, 270);
System.out.println("Numbers are " + c.printLine());
}
}
Let's make it challenging.
Numbers are 270.0 + 150.0.
42
What is the output of the following code?
class MoreDifficultClass {
public MoreDifficultClass() {
System.out.println("Let's make it challenging.");
}
public MoreDifficultClass(int num1) {
System.out.println("Print Here!");
}
}
class DifficultClass extends MoreDifficultClass {
private final double num1;
private final double num2;
public DifficultClass(double num2, double num1) {
this.num1 = num2;
this.num2 = num1;
}
public String printLine() {
return "" + num2 + " + " + num1 + ".";
}
}
public class SampleClass {
public static void main(String args[])
{
DifficultClass c = new MoreDifficultClass(150);
System.out.println("Numbers are " + c.printLine());
}
}
Compile-time Error
43
What is the output of the following code?
class MoreDifficultClass {
public MoreDifficultClass() {
System.out.println("Let's make it challenging.");
}
public MoreDifficultClass(int num1) {
System.out.println("Print Here!");
}
public String printLine() {
return "Successful printing!";
}
}
class DifficultClass extends MoreDifficultClass {
private final double num1;
private final double num2;
public DifficultClass() {
num1 = 340;
num2 = 580;
System.out.println("Printing Hatdog!");
}
public DifficultClass(double num2, double num1) {
this.num1 = num2;
this.num2 = num1;
}
public String printLine() {
return "" + num2 + " + " + num1 + ".";
}
}
public class SampleClass {
public static void main(String args[])
{
MoreDifficultClass c = new DifficultClass();
System.out.println("Numbers are " + c.printLine());
}
}
Let's make it challenging.
Printing Hatdog!
Numbers are 580.0 + 340.0.
44
What is the output of the following code?
class Jujutsu
{
int showJujutsu(int num)
{
num /= 50;
return num;
}
}
class SpecialGrade extends Jujutsu
{
int showSorcerer(int num)
{
num *= 10;
return showJujutsu(num);
}
}
public class SampleClass
{
public static void main(String[] args)
{
SpecialGrade gojo = new SpecialGrade();
System.out.println(gojo.showSorcerer(500));
}
}
100
45
What is the output of the following code?
class Resource {
String resourceName = "";
float resourceSalary = 0;
public void printSalary() {
resourceSalary += 10000;
System.out.println("Salary is " + resourceSalary);
}
}
class Analyst extends Resource {
public void printSalary() {
resourceSalary += 30000;
System.out.println("Salary is " + resourceSalary);
}
}
public class SampleClass {
public static void main(String[] args) {
Resource s = new Resource();
Analyst a = new Analyst();
Resource res = new Analyst();
s.printSalary();
a.printSalary();
res.printSalary();
}
}
Salary is 10000.0
Salary is 30000.0
Salary is 30000.0
46
What is the output of the following code?
class Resource {
String resourceName = "";
float resourceSalary = 0;
public void printSalary() {
resourceSalary += 10000;
System.out.println("Salary is " + resourceSalary);
}
}
class Analyst extends Resource {
public void printSalary() {
resourceSalary += 30000;
System.out.println("Salary is " + resourceSalary);
}
}
public class SampleClass {
public static void main(String[] args) {
Resource s = new Resource();
Analyst a = new Analyst();
Analyst ana = new Resource();
s.printSalary();
a.printSalary();
ana.printSalary();
}
}
Compile-time Error
47
What is the output of the following code?
class Resource {
String resourceName = "";
float resourceSalary = 0;
public void printSalary() {
System.out.println("Salary is " + resourceSalary);
}
public void printSalary(float resourceName) {
this.resourceSalary = resourceName;
System.out.println("Salary is " + resourceSalary);
}
public void printSalary(String resourceName, float resourceSalary) {
this.resourceName = resourceName;
this.resourceSalary = resourceSalary;
System.out.println("Salary is " + resourceSalary);
}
}
class Analyst extends Resource {
public void printSalary() {
resourceSalary += 30000;
System.out.println("Salary is " + resourceSalary);
}
}
public class SampleClass {
public static void main(String[] args) {
Analyst a = new Analyst();
a.printSalary("All Might", 10000);
a.printSalary();
a.printSalary(19000);
}
}
Salary is 10000.0
Salary is 40000.0
Salary is 19000.0
48
What is the output of the following code?
class Resource {
String resourceName = "";
float resourceSalary = 0;
public void printSalary() {
System.out.println("Salary is " + resourceSalary);
}
public void printSalary(float resourceName) {
this.resourceSalary = resourceName;
System.out.println("Salary is " + resourceSalary);
}
public void printSalary(String resourceName, float resourceSalary) {
this.resourceName = resourceName;
this.resourceSalary = resourceSalary;
System.out.println("Salary is " + resourceSalary);
}
}
class Analyst extends Resource {
public void printSalary() {
resourceSalary += 30000;
System.out.println("Salary is " + resourceSalary);
}
}
public class SampleClass {
public static void main(String[] args) {
Analyst a = new Resource();
a.printSalary("All Might", 10000);
a.printSalary();
a.printSalary(19000);
}
}
Compile-time Error
49
What is the output of the following code?
class Resource {
String resourceName = "";
float resourceSalary = 0;
public void printSalary() {
System.out.println("Salary is " + resourceSalary);
}
public void printSalary(float resourceName) {
this.resourceSalary = resourceName;
System.out.println("Salary is " + resourceSalary);
}
public void printSalary(String resourceName, float resourceSalary) {
this.resourceName = resourceName;
this.resourceSalary = resourceSalary;
System.out.println("Salary is " + resourceSalary);
}
}
class Analyst extends Resource {
public void printSalary() {
resourceSalary += 30000;
System.out.println("Salary is " + resourceSalary);
}
}
public class SampleClass {
public static void main(String[] args) {
Resource a = new Analyst();
a.printSalary("All Might", 10000);
a.printSalary();
a.printSalary(19000);
}
}
Salary is 10000.0
Salary is 40000.0
Salary is 19000.0
50
What is the output of the following code?
import java.util.ArrayList;
public class SampleClass {
public static void main(String[] args) {
Integer i = new Integer(3000);
int num1 = i.intValue();
int num2 = i;
ArrayList numbers = new ArrayList();
numbers.add(num1);
numbers.add(num2);
for(Integer integer: numbers) {
System.out.print(integer);
}
}
}
30003000
