Question

I’m trying to convert below Java code to Scala:

Map<String, List<String>> allEntriesMap = getEntries();
for (Map.Entry<String, List<String>> allEntriesMapEntry : allEntriesMap
        .entrySet()) {
}

Here is the current Scala version of above Java code:

var allEntriesMap : Map[String, List[String]] = getEntries();
for (allEntriesMap.entrySet[String, List[String]] allEntriesMapEntry :
        allEntriesMap.entrySet()) {
}

I’m receiving this error for line

for (allEntriesMap.entrySet[String, List[String]] allEntriesMapEntry : 

illegal start of simple pattern

How can above code be finished so that it performs same Java functionality but written in Scala?

Answer 1

The problem is that you use incorrect syntax. This

for (allEntriesMap.entrySet[String, List[String]] allEntriesMapEntry : allEntriesMap.entrySet()) {

    }

Should be written as:

for (entry: Map.Entry[String, List[String]] <- allEntriesMap.entrySet()) {

}

or simply

for (entry <- allEntriesMap.entrySet) {

}

Moreover, if you’re using java collections type you have to import scala.collections.JavaConversions._ into scope (that will implicitly convert java collections into scala ones, so you may use all set of operations on them).