Understanding Autoboxing and Unboxing

What is the definition of Autoboxing in Java?

• Autoboxing is the automatic conversion between primitive types and their corresponding wrapper classes in Java.

• Autoboxing is the manual conversion of wrapper classes to primitive types.

• Autoboxing refers to the process of creating new primitive types.

• Autoboxing is a method to convert strings to integers.

How does Unboxing differ from Autoboxing?

• Autoboxing and unboxing are the same process.

• Unboxing is a method to convert strings to integers.

• Autoboxing converts primitives to wrappers; unboxing converts wrappers to primitives.

• Autoboxing converts wrappers to primitives; unboxing converts primitives to wrappers.

What is the purpose of Wrapper Classes in Java?

• To provide additional methods for primitive types.

• To enhance the performance of primitive data types.

• The purpose of Wrapper Classes in Java is to convert primitive data types into objects.

• To replace primitive types with more efficient data structures.

What happens during the Unboxing process?

• The unboxing process involves opening the packaging and revealing the product inside.

• The unboxing process is when the product is returned to the store.

• The unboxing process refers to the product being displayed in a store.

• The unboxing process involves assembling the product from its parts.

What are the performance implications of Autoboxing?

• Autoboxing eliminates the need for garbage collection.

• Autoboxing has no impact on performance whatsoever.

• Autoboxing can lead to performance overhead due to increased object creation and garbage collection.

• Autoboxing improves performance by reducing memory usage.

How does Java handle primitive types and their corresponding Wrapper Classes?

• Primitive types and Wrapper Classes are the same in Java and do not require conversion.

• Java requires explicit casting between primitive types and Wrapper Classes at all times.

• Java does not support primitive types and only uses Wrapper Classes.

• Java handles primitive types and their corresponding Wrapper Classes through autoboxing and unboxing, allowing seamless conversion between them.

class Function {

public void change ( Integer i )

{

System.out.println(i);

}

}

class Main {

public static void main ( String args [ ] )

{

int i = 10;

change(i);

}

}

What is the output of the program ?

• 10

• i

• change(i)

• Compilation Error

Autoboxing in Java eliminates which function in the program ?

• Main function

• Implicit type casting

• Explicit type casting

• Operator overloading.

class Casting {

public static void main ( String args [ ] )

{

long l = 12345;

Byte b = l;

}

}

What is the output of the program ?

• Compilation error.

• Compiled but no output.

• b

• 1

class Main {

public static void main ( String args [ ] )

{

Integer i = new Integer();

i = 100;

Short s = i;

System.out.println(s);

}

}

What will be the output of the program ?

• s

• i

• (s)

• 100