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Core Java - Interview Questions and Answers for 'Boxing' - 4 question(s) found - Order By Newest

 Q1. What are concepts introduced with Java 5 ?Core Java
Anonymous
Ans. Generics , Enums , Autoboxing , Annotations and Static Import.

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   Like         Discuss         Correct / Improve     java   java5   generics   enum   autoboxing   annotations   static import        rare

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 Q2. Explain Autoboxing ?Core Java
Anonymous
Ans. Autoboxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes

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   Like         Discuss         Correct / Improve     java   java5   autoboxing   wrapper classes     Asked in 2 Companies      basic        frequent


 Q3. Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?

List list1 = new ArrayList<>();
list1.add(5);
list1.add("5");
Admin
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Ans. If we don't declare the list to be of specific type, it treats it as list of objects.

int 1 is auto boxed to Integer and "1" is String and hence both are objects.

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   Like         Discuss         Correct / Improve     java   collections   arraylist   list   autoboxing   wrapper classes      expert        rare


 Q4. What is Boxing conversion ?Core Java2017-06-06 12:31:36

Ans. Boxing conversion converts expressions of primitive type to corresponding expressions of reference type.

For example

boolean to Boolean
long to Long
double to Double

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   Like         Discuss         Correct / Improve     data type  boxing  wrapper classes



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