Java Programming Multiple Choice Questions (MCQs) and Answers

Q61 What will the following code output:
class Test {
static int x = 10;
} public class Main {
public static void main(String[] args) {
Test t1 = new Test(); System.out.println(t1.x); } }

Q62 Analyze the output of this code snippet:
class Car {
String model; Car(String model) { this.model = model;
}
} public class Main {
public static void main(String[] args) { Car myCar = new Car("Tesla"); System.out.println(myCar.model); } }

Q63 What does this Java code do?
class Animal {
void sound() {
System.out.println("Generic Sound");
}
} class Dog extends Animal { void sound() { System.out.println("Bark"); } } public class Main { public static void main(String[] args) { Animal myAnimal = new Dog(); myAnimal.sound(); } }

Q64 What will this pseudocode output?
CLASS Vehicle SET wheels = 4 METHOD showWheels PRINT wheels END CLASS Main CREATE Vehicle v CALL v.showWheels

Q65 Determine the output of this pseudocode:

CLASS Animal METHOD sound PRINT "Generic Sound" END CLASS Dog EXTENDS Animal METHOD sound PRINT "Bark" END CLASS Main CREATE Dog d CALL d.sound

Q66 What will be the result of this pseudocode?

CLASS Book VARIABLE title = "Java Programming" METHOD getTitle PRINT title END CLASS Main CREATE Book b CALL b.getTitle

Q67 Analyze this pseudocode:

CLASS Shape METHOD area RETURN 0 END CLASS Circle EXTENDS Shape VARIABLE radius = 5 METHOD area RETURN 3.14 * radius * radius END CLASS Main CREATE Circle c PRINT c.area

Q68 Identify the issue in this code snippet:
class Book {
private String title; void setTitle(String title) {
title = title; }
}

Q69 Spot the mistake:
class Calculator {
static void sum(int a, int b) {
System.out.println(a + b);
}
public static void main(String[] args) {
sum(10, 20); }
}

Q70 Find the error in this Java code:
class Animal {
Animal() {
System.out.println("An animal is created");
}
} class Dog extends Animal {
Dog() { super();
System.out.println("A dog is created");
}
} public class Main {
public static void main(String[] args) {
Dog dog = new Dog();
}
}

Q71 What is an abstract class in Java?

Q72 How does StringBuilder differ from StringBuffer in Java?

Q73 In Java, what is an interface?

Q74 Can an interface in Java contain default methods?

Q75 What happens when a class implements an interface in Java?

Q76 Can an interface in Java extend multiple interfaces?

Q77 What will this Java code output?
interface Printable {
void print();
}
class Test implements Printable { public void print() {
System.out.println("Hello");
} }
public class Main {
public static void main(String[] args) {
Test t = new Test();
t.print(); }
}

Q78 Analyze the output of this code snippet:
interface A {
int val = 5;
}
interface B extends A {
int val = 10;
}
class Test implements B {
void display() {
System.out.println(val);
}
} public class Main {
public static void main(String[] args) {
Test t = new Test();
t.display();
}
}

Q79 What is the primary purpose of a package in Java?

Q80 What does the 'import' statement do in a Java program?

Q81 How do you access a class from a package in Java?

Q82 What is the significance of the CLASSPATH environment variable in Java?

Q83 What is an exception in Java?

Q84 What is the purpose of a try-catch block in Java?

Q85 What happens if an exception is thrown in a try block and is not caught in the corresponding catch block?

Q86 Which keyword is used to manually throw an exception in Java?

Q87 What is the difference between checked and unchecked exceptions in Java?

Q88 What will the following code output:
try {
int a = 5 / 0;
System.out.println(a);
}
catch (ArithmeticException e) {
System.out.println("Arithmetic Error");
}

Q89 Analyze the output of this code snippet:
try {
int[] arr = new int[5];
arr[10] = 100;
System.out.println("Value set");
}
catch (ArrayIndexOutOfBoundsException e) {
System.out.println("Index Error");
}

Q90 What will this pseudocode output?
SET a = 10
SET b = 0
TRY
SET c = a / b
CATCH EXCEPTION PRINT "Error" END TRY