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Amazon Interview Question for Development Support Engineers






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I said int is a primitive data type and Integer is a wrapper class around it. The need for Integer is to have methods on the primitive data type like say conversion of an String to integer we user Integer.parseInt()

- perllove January 19, 2008 | Flag Reply
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I said int is a primitive data type and Integer is a wrapper class around it. The need for Integer is to have methods on the primitive data type like say conversion of an String to integer we user Integer.parseInt()

- perllove January 19, 2008 | Flag Reply
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IT is required to achieve portability between languages and platforms. All JVM compliant languages can use Integer type without having to worry about internal representation. Else code becomes language specific and platform specific. It is called Common Type system

- Anonymous September 23, 2009 | Flag Reply
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I agree with all above reasons but the main reason i think that makes the presence of Integer justified is its use in generics. How will otherwise you use int in an ArrayList or HashMap when you have no equals() or hashcode() method associated with it (since int is primitve and do not extend Object)

- am March 07, 2010 | Flag Reply
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definitely....to make primitive data types as other class-objects..........an OOPs feature of java

- chandan.here4u May 22, 2011 | Flag
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I think Wrapper classes were part of java even before generics

- anshulzunke September 16, 2011 | Flag
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agreed with anshulzunke.

there were no primitive data types in the very first version of Java but this made the java language very slower, because it is expensive to have even the numbers in the object form.
That is when 'primitive data types' were introduced, which is why we can not say java is 100% object-oriented language.

- Sr March 16, 2012 | Flag
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Integer class is available since v.1.0 of Java. It is wrapper for primitive "int".

- bamba May 10, 2012 | Flag


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