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In Java, which of the following is an example of autounboxing?
Answer & Solution
Correct Answer:
Option
D
Autounboxing in Java refers to the automatic conversion of a wrapper class object to its corresponding primitive type.
For example, converting an Integer object to an int, or a Double object to a double.
Let's examine the options:
Option A: String text = "Hello"; — This is just assigning a String literal to a String variable, not related to autounboxing.
Option B: int value = Integer.parseInt("42"); — This parses a String to a primitive int, but it does not involve autounboxing because no wrapper object is involved.
Option C: Double result = 3.14; — This is an example of autoboxing (primitive to wrapper), not autounboxing.
Since none of the options demonstrate converting a wrapper object to a primitive type, the correct answer is None of These.
For example, converting an Integer object to an int, or a Double object to a double.
Let's examine the options:
Option A: String text = "Hello"; — This is just assigning a String literal to a String variable, not related to autounboxing.
Option B: int value = Integer.parseInt("42"); — This parses a String to a primitive int, but it does not involve autounboxing because no wrapper object is involved.
Option C: Double result = 3.14; — This is an example of autoboxing (primitive to wrapper), not autounboxing.
Since none of the options demonstrate converting a wrapper object to a primitive type, the correct answer is None of These.
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LoginA. "String text = "Hello";
This is just a String assignment and has nothing to do with autounboxing. Strings are not primitive types or their wrappers.
B. "int value = Integer.parseInt("42");
This is a method call (Integer.parseInt) that converts a String to a primitive int. It does not involve converting a wrapper object to a primitive type, so it's not autounboxing.
C. "Double result = 3.14;
This is an example of autoboxing, where the primitive double value 3.14 is automatically converted to its wrapper class Double. Autoboxing is the opposite of autounboxing.