StackOverflow2013

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plurals

PO
primarykey
Id
8660812
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2011-12-28T20:18:13.723
FavoriteCount
0
LastActivityDate
2015-12-04T13:13:10.093
LastEditDate
2015-12-04T13:13:10.093
LastEditorUserId
923720
OwnerUserId
923720
ParentId
8660691
PostTypeId
2
Score
244
ViewCount
0
LastEditorDisplayName
text
Body
<code>int</code> is a primitive type. Variables of type <code>int</code> store the actual binary value for the integer you want to represent. <code>int.parseInt("1")</code> doesn't make sense because <code>int</code> is not a class and therefore doesn't have any methods. <code>Integer</code> is a class, no different from any other in the Java language. Variables of type <code>Integer</code> store references to <code>Integer</code> objects, just as with any other reference (object) type. <code>Integer.parseInt("1")</code> is a call to the static method <code>parseInt</code> from class <code>Integer</code> (note that this method actually returns an <code>int</code> and not an <code>Integer</code>). To be more specific, <code>Integer</code> is a class with a single field of type <code>int</code>. This class is used where you need an <code>int</code> to be treated like any other object, such as in generic types or situations where you need nullability. Note that every primitive type in Java has an equivalent wrapper class: <ul> <li><code>byte</code> has <code>Byte</code></li> <li><code>short</code> has <code>Short</code></li> <li><code>int</code> has <code>Integer</code></li> <li><code>long</code> has <code>Long</code></li> <li><code>boolean</code> has <code>Boolean</code></li> <li><code>char</code> has <code>Character</code></li> <li><code>float</code> has <code>Float</code></li> <li><code>double</code> has <code>Double</code></li> </ul> Wrapper classes inherit from Object class, and primitive don't. So it can be used in collections with Object reference or with Generics. Since java 5 we have autoboxing, and the conversion between primitive and wrapper class is done automatically. Beware, however, as this can introduce subtle bugs and performance problems; being explicit about conversions never hurts.
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1. POWhat is the difference between Integer and int in Java?
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1. PTAnswer
UserLastEditorUserId
1. USDarkhogg
UserOwnerUserId
1. USDarkhogg
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1. POWhat is the difference between Integer and int in Java?
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1. VO
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2. VO
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