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Java Programming 1 > Midterm Reviewer > Flashcards

Midterm Reviewer Flashcards

1
Q

A component of a program that knows how to perform methods and interact with other objects.

A

Object

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2
Q

Does not occupy any memory space and is only a logical representation of data.

A

Class

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3
Q

How is an object created?

A

An object is created when a class is instantiated.

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4
Q

Java Virtual Machine executes much faster. To which Java characteristic does this pertain?

A

High-Performance

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5
Q

Complete date when JDK (Java Development Kit) 1.0 was released.

A

January 23, 1996

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6
Q

A reserved area in memory that holds a value which can be changed while the program is being executed

A

Variable

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7
Q

Created using defined constructors of classes and used to access objects.

A

Reference Data Types

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8
Q

A block of code similar to a method and is called when an instance of class is created.

A

Constructor

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9
Q

A collection of statements grouped together to perform an operation.

A

Method

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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

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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

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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

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13
Q

Variables, methods and constructors which are declared public can be accessed by any class (True or False)

A

TRUE

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14
Q

Variables defined inside methods, constructors or blocks.

A

Class Variable

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15
Q

Keywords and identifiers can be used as variable names in Java (True or False)

A

FALSE

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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

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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

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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

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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

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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

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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
Q

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);        
}         }
A

Second Constructor

26
Q

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);        
}         }
A

ERROR

27
Q

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);
}         }
A

This is an integer.

28
Q

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();
} }
A

OneThreeHelloTwo

29
Q

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 ");
    }
}     }
A

Third Fourth Fifth

30
Q

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);
}
}

A

Error

31
Q

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);
} }
A

ERROR

32
Q

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();
}
}

A

No output

33
Q

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 + ", ");
        }
    }
}         }
A

0 1, 0 2, 1 0, 1 2, 2 0, 2 1,

34
Q

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 + " ");

}

}

A

ERROR

35
Q

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.");
} }
A

ERROR

36
Q

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();
}
}

A

Compile-time Error

37
Q

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();
}
}

A

Compile-time Error

38
Q

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();
}
}

A

Compile-time Error

39
Q

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();
}
}

A

Rasengan!

Shadow Clone Technique!

40
Q

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());
}
}

A

Numbers are 270.0 + 150.0.

41
Q

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());
}
}

A

Let’s make it challenging.
Numbers are 270.0 + 150.0.

42
Q

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());
}
}

A

Compile-time Error

43
Q

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());
}
}

A

Let’s make it challenging.
Printing Hatdog!
Numbers are 580.0 + 340.0.

44
Q

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));
}
}

A

100

45
Q

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();
} }
A

Salary is 10000.0
Salary is 30000.0
Salary is 30000.0

46
Q

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();
    
} }
A

Compile-time Error

47
Q

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);
} }
A

Salary is 10000.0
Salary is 40000.0
Salary is 19000.0

48
Q

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);
} }
A

Compile-time Error

49
Q

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);
} }
A

Salary is 10000.0
Salary is 40000.0
Salary is 19000.0

50
Q

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<Integer> numbers = new ArrayList<Integer>();
    numbers.add(num1);
    numbers.add(num2);
    
    for(Integer integer: numbers) {
        System.out.print(integer);
    }
} }
A

30003000

Java Programming 1 (1 decks)

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