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scala.MatchError: J (of class java.lang.String)	at undefined.PatternMatch3_2$$anonfun$main$1.apply(PatternMatch3_2.scala:7)	at undefined.PatternMatch3_2$$anonfun$main$1.apply(PatternMatch3_2.scala:6)	at scala.collection.immutable.List.foreach(List.scala:318)	at undefined.PatternMatch3_2$.main(PatternMatch3_2.scala:6)	at undefined.PatternMatch3_2.main(PatternMatch3_2.scala)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at scala.tools.nsc.util.ScalaClassLoader$$anonfun$run$1.apply(ScalaClassLoader.scala:71)	at scala.tools.nsc.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:31)	at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:139)	at scala.tools.nsc.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:71)	at scala.tools.nsc.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:139)	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:28)	at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:45)	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:35)	at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:45)	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:74)	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:96)	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:105)	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)