Java Programming Quiz

What is the primary difference between method overloading and method overriding in Java?

• Overloading occurs at runtime, while overriding occurs at compile time.

• Overloading requires different method names, while overriding does not.

• Overloading requires different parameter lists, while overriding uses the same parameter list.

• Overloading works only in the parent class, while overriding works only in the child class.

Which of the following is true about the final keyword in Java?

• A final method can be overridden in a subclass.

• A final class can extend another class.

• A final variable can be re-assigned once initialized.

• A final class cannot be subclassed.

What happens if a throws clause is used in a method but no exception is thrown in the method body?

• A compile-time error occurs.

• A runtime error occurs.

• The program compiles and runs successfully.

• The JVM generates a warning.

Which of these statements is NOT true about interfaces in Java?

• Interfaces support multiple inheritance.

• Interfaces can include static methods with a body.

• Interfaces can have private methods.

• A class can extend multiple interfaces simultaneously.

Which of the following correctly defines the relationship between packages and access modifiers?

• Classes in the same package can access private members.

• Classes in different packages can access protected members via inheritance.

• The default access modifier is accessible only within the class.

• The public modifier restricts access within the package.

What is the correct order of execution for try, catch, and finally blocks?

• try -> catch -> finally

• finally -> try -> catch

• catch -> try -> finally

• try -> finally -> catch

What will be the output of the following code?

class Animal {

void sound() {

System.out.println("Animal makes a sound");

}

}

class Dog extends Animal {

@Override void sound() {

System.out.println("Dog barks");

}

}

public class Main { public static void main(String[] args) {

Animal obj = new Dog(); obj.sound();

}

}

• Animal makes a sound

• Dog barks

• Compilation error: Method sound() cannot be overridden.

• Runtime error: Method sound() not found.

What will be the output of the following code? abstract class Shape {

abstract void area();

}

class Circle extends Shape {

void area() {

System.out.println("Calculating area of Circle");

}

}

public class Main { public static void main(String[] args) {

Shape shape = new Circle();

shape.area();

}

• Compilation error: Abstract methods cannot have a body.

• Compilation error: Cannot instantiate the abstract class Shape.

• Calculating area of Circle

• Runtime error: Abstract class method not implemented.

What will be the output of the following code?

interface Printable {

void print();

}

class Document implements Printable {

public void print() {

System.out.println("Printing Document");

}

}

public class Main { public static void main(String[] args) {

Printable doc = new Document();

doc.print();

}

• Compilation error: The class Document must be declared abstract.

• Printing Document

• Runtime error: Cannot create an instance of the interface Printable.

• Compilation error: Method print() in Document is not public.

What will be the output of the following code?

public class Main { public static void main(String[] args) {

try {

int result = 10 / 0;

}

catch (ArithmeticException e) {

System.out.println("ArithmeticException caught");

}

finally { System.out.println("Execution of finally block");

}

}

• Compilation error: The class Document must be declared abstract.

• ArithmeticException caught Execution of finally block

• Runtime error: Cannot create an instance of the interface

• Compilation error