Wrapper classes in Java are used to convert primitive data types into object form, enabling their use in collections, object-oriented programming, and frameworks like JDBC and Hibernate. Understanding wrapper classes helps developers work with autoboxing, null safety, and collections more effectively.
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Which of the following is a wrapper class for int?
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Question 3 of 15
3. Question
Wrapper classes are located in which package?
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Question 4 of 15
4. Question
Which primitive type does the Character wrapper class represent?
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Question 5 of 15
5. Question
Which method converts an Integer object to a primitive int?
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Question 6 of 15
6. Question
What is the output of: Integer x = 10; int y = x;?
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Question 7 of 15
7. Question
What is the process of converting a primitive type into its wrapper object?
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Question 8 of 15
8. Question
Which of the following can hold a null value?
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Question 9 of 15
9. Question
Why are wrapper classes useful in Java collections like ArrayList?
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Question 10 of 15
10. Question
What will Integer.valueOf(“10”) return?
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Question 11 of 15
11. Question
Which method is used to convert a String to int in Java?
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Question 12 of 15
12. Question
Which one of these is not a valid wrapper class?
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Question 13 of 15
13. Question
Wrapper classes in Java are ____________.
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Question 14 of 15
14. Question
What is autoboxing in Java?
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Question 15 of 15
15. Question
What is the wrapper class for boolean in Java?
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Summary
Wrapper Classes in Java provide a bridge between primitive data types and object-oriented features like collections, method arguments, and null handling. With support for autoboxing and unboxing, Java makes it seamless to use primitives and objects together efficiently.
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