Autoboxing in Java is the automatic conversion of primitive types to their corresponding wrapper classes, while Unboxing is the reverse — converting wrapper objects back to primitives. Introduced in Java 5, these features simplify code and allow primitives to work seamlessly with collections and generics.
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Which Java version introduced autoboxing and unboxing?
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Question 4 of 15
4. Question
Which of the following demonstrates autoboxing?
Integer num = 5;
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Question 5 of 15
5. Question
Which class is used in autoboxing of double?
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Question 6 of 15
6. Question
Which is an example of unboxing?
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Question 7 of 15
7. Question
Which of these collections rely on autoboxing?
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Question 8 of 15
8. Question
Which primitive type matches the wrapper class Character?
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Question 9 of 15
9. Question
Which is not a wrapper class in Java?
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Question 10 of 15
10. Question
Can autoboxing cause NullPointerException?
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Question 11 of 15
11. Question
What is the wrapper class for primitive byte?
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Question 12 of 15
12. Question
Which code causes unboxing?
Integer obj = new Integer(20); int val = obj;
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Question 13 of 15
13. Question
What will happen in this code?
Integer x = null; int y = x;
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Question 14 of 15
14. Question
Which method manually converts primitive to wrapper?
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Question 15 of 15
15. Question
Which of the following is true?
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Summary
Autoboxing and Unboxing are powerful features introduced in Java 5 that automate conversion between primitive types and wrapper classes. This enables smoother use of collections, better readability, and less manual code. However, developers must handle null values carefully during unboxing to avoid runtime exceptions.
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