StackOverflow2013

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plurals

PO
primarykey
Id
1567213
data
AcceptedAnswerId
0
AnswerCount
0
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CommentCount
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CreationDate
2009-10-14T15:49:21.280
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2012-12-05T17:02:34.590
LastEditDate
2017-05-23T12:24:56.423
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OwnerUserId
149284
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1566315
PostTypeId
2
Score
19
ViewCount
0
LastEditorDisplayName
text
Body
This question is almost a duplicate of: <a href="https://stackoverflow.com/questions/1545229/scala-cant-multiply-java-doubles">Scala can't multiply java Doubles?</a> - you can look at <a href="https://stackoverflow.com/questions/1545229/scala-cant-multiply-java-doubles/1545418#1545418">my answer</a> as well, as the idea is similar. As <a href="https://stackoverflow.com/users/172677/eastsun">Eastsun</a> already hinted, the answer is an implicit conversion from an <code>java.lang.Integer</code> (basically a boxed <code>int</code> primitive) to a <code>scala.Int</code>, which is the Scala way of representing JVM primitive integers. <pre><code>implicit def javaToScalaInt(d: java.lang.Integer) = d.intValue </code></pre> And interoperability has been achieved - the code snipped you've given should compile just fine! And code that uses <code>scala.Int</code> where <code>java.lang.Integer</code> is needed seems to work just fine due to autoboxing. So the following works: <pre><code>def foo(d: java.lang.Integer) = println(d) val z: scala.Int = 1 foo(z) </code></pre> Also, as <a href="https://stackoverflow.com/users/189058/michaelkebe">michaelkebe</a> said, do not use the <code>Integer</code> type - which is actually shorthand for <code>scala.Predef.Integer</code> as it is deprecated and most probably is going to be removed in Scala 2.8. EDIT: Oops... forgot to answer the why. The error you get is probably that the <code>scala.Predef.Integer</code> tried to mimic Java's syntactic sugar where <code>a + "my String"</code> means string concatenation, <code>a</code> is an <code>int</code>. Therefore the <code>+</code> method in the <code>scala.Predef.Integer</code> type only does string concatenation (expecting a <code>String</code> type) and no natural integer addition. -- Flaviu Cipcigan
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1. POInt vs Integer: type mismatch, found: Int, required: String
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1. POInt vs Integer: type mismatch, found: Int, required: String
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