Java Autoboxing MCQs Questions | Java Program MCQs Page-2 section-1

11.
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`

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12.
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`

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13.
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

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14.
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`

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15.
In Java, which method can be used to perform autounboxing?

A. `.valueOf()`

B. `.equals()`

C. `.intValue()`

D. `.compareTo()`

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16.
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

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17.
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`

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18.
Which wrapper class corresponds to the `char` primitive type in Java?

A. `String`

B. `Integer`

C. `Float`

D. `Character`

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19.
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`

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20.
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()`

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Java Autoboxing MCQs Questions | Java Program MCQs

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

Answer & Solution

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

Answer & Solution

13. What is autounboxing in Java?

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

11.
What is the result of the following code in Java?
Integer a = 1000;
Integer b = 1000;
System.out.println(a == b);

12.
In Java, which of the following is a valid autoboxing conversion?

13.
What is autounboxing in Java?

14.
What happens if you try to unbox a `null` reference in Java?

15.
In Java, which method can be used to perform autounboxing?

16.
What is the result of the following code in Java?
Double x = 3.5;
Double y = 3.5;
System.out.println(x.equals(y));

17.
In Java, what is the result of the expression `Integer.valueOf(10) + Integer.valueOf(20)`?

18.
Which wrapper class corresponds to the `char` primitive type in Java?

19.
What is the result of the following code in Java?
Integer a = 100;
int b = a;

20.
In Java, which method can be used to convert a string to an integer?