Java Autoboxing MCQs Questions

1

What is autoboxing in Java?

A) The automatic conversion of primitive types to their corresponding wrapper classes B) The process of creating a new box C) A feature for manually converting wrapper classes to primitive types D) A feature for boxing objects

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Answer & Solution

Answer: Option A

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2

Which primitive type corresponds to the `Integer` wrapper class in Java?

A) `char` B) `boolean` C) `float` D) `int`

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Answer & Solution

Answer: Option D

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3

What is the primary benefit of autoboxing in Java?

A) It improves memory management B) It reduces code complexity C) It simplifies code by automatically converting between primitive types and their corresponding wrapper classes D) It speeds up code execution

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Answer & Solution

Answer: Option C

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4

In Java, which classes are used for autoboxing and unboxing operations?

A) Exception classes (e.g., `RuntimeException`) B) Wrapper classes (e.g., `Integer`, `Double`) C) Collection classes (e.g., `ArrayList`, `HashMap`) D) None of These

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Answer & Solution

Answer: Option B

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5

What happens if you try to unbox a `null` reference in Java?

A) It throws a `ClassCastException` B) It returns `null` C) It throws a `NullPointerException` D) It returns the default value for the primitive type

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Answer & Solution

Answer: Option C

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6

Which operator is used for autoboxing and unboxing in Java?

A) `==` B) `+` C) `&` D) `=`

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Answer & Solution

Answer: Option D

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7

Which of the following statements is true about autoboxing in Java?

A) Autoboxing is introduced in Java 5.0 and later versions B) Autoboxing requires explicit casting C) Autoboxing is used only for primitive types D) Autoboxing is not used in Java

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Answer & Solution

Answer: Option A

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8

In Java, which method can be used to perform unboxing?

A) `.compareTo()` B) `.equals()` C) `.valueOf()` D) `.intValue()`

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Answer & Solution

Answer: Option D

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9

What is the result of the following code in Java?
Integer x = 5;
Integer y = 5;
System.out.println(x == y);

A) `false` B) Compilation error C) `true` D) Runtime error

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Answer & Solution

Answer: Option C

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10

Which of the following is an example of autoboxing in Java?

A) `String text = "Hello";` B) `Integer num = 42;` C) `Double result = 3.14;` D) None of These

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Answer & Solution

Answer: Option B

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Java Autoboxing MCQs Questions | Java Program MCQs