Java Autoboxing MCQs Questions

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What is the result of the following code in Java?
Integer a = 1000;
Integer b = 1000;
System.out.println(a == b);

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

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

In Java, which of the following is a valid autoboxing conversion?

A) `String` to `Integer` B) `Integer` to `double` C) `boolean` to `String` D) `int` to `Integer`

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

What is autounboxing in Java?

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

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

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

Discuss

Answer & Solution

Answer: Option D

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

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

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Answer & Solution

Answer: Option C

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What is the result of the following code in Java?
Double x = 3.5;
Double y = 3.5;
System.out.println(x.equals(y));

A) Compilation error B) `true` C) Runtime error D) None of These

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

In Java, what is the result of the expression `Integer.valueOf(10) + Integer.valueOf(20)`?

A) Runtime error B) Compilation error C) `30` D) `1020`

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

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

A) `String` B) `Integer` C) `Float` D) `Character`

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

What is the result of the following code in Java?
Integer a = 100;
int b = a;

A) `No error, it compiles successfully` B) `Compilation error` C) `Runtime error` D) `NullPointerException`

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

In Java, which method can be used to convert a string to an integer?

A) `Integer.toString()` B) `String.valueOf()` C) `Integer.valueOf()` D) `Integer.parseInt()`

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

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Java Autoboxing MCQs Questions | Java Program MCQs