StackOverflow2013

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Id
3952292
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0
AnswerCount
0
ClosedDate
CommentCount
7
CommunityOwnedDate
CreationDate
2010-10-17T06:44:49.880
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0
LastActivityDate
2017-05-04T12:57:14.477
LastEditDate
2017-05-23T12:02:48.590
LastEditorUserId
-1
OwnerUserId
139985
ParentId
141284
PostTypeId
2
Score
231
ViewCount
0
LastEditorDisplayName
text
Body
<blockquote> What are the differences in the applications of <code>Runnable</code> and <code>Callable</code>. Is the difference only with the return parameter present in <code>Callable</code>? </blockquote> Basically, yes. See the answers to <a href="https://stackoverflow.com/questions/141284/the-difference-between-the-runnable-and-callable-interfaces-in-java">this question</a>. And the <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Callable.html" rel="noreferrer">javadoc for <code>Callable</code></a>. <blockquote> What is the need of having both if <code>Callable</code> can do all that <code>Runnable</code> does? </blockquote> Because the <code>Runnable</code> interface cannot do everything that <code>Callable</code> does! <code>Runnable</code> has been around since Java 1.0, but <code>Callable</code> was only introduced in Java 1.5 ... to handle use-cases that <code>Runnable</code> does not support. In theory, the Java team could have changed the signature of the <code>Runnable.run()</code> method, but this would have broken binary compatiblity with pre-1.5 code, requiring recoding when migrating old Java code to newer JVMs. That is a BIG NO-NO. Java strives to be backwards compatible ... and that's been one of Java's biggest selling points for business computing. And, obviously, there are use-cases where a task doesn't need to return a result or throw a checked exception. For those use-cases, using <code>Runnable</code> is more concise than using <code>Callable<Void></code> and returning a dummy (<code>null</code>) value from the <code>call()</code> method.
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1. POThe difference between the Runnable and Callable interfaces in Java
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1. PTAnswer
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1. USCommunity
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1. USStephen C
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1. POJava: Runnable vs Callable - When to use
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