Convert Java List to Scala Seq

Question

I need to implement a method that returns a Scala Seq, in Java.

But I encounter this error:

java.util.ArrayList cannot be cast to scala.collection.Seq 

Here is my code so far:

@Override public Seq<String> columnNames() {     List<String> a = new ArrayList<String>();     a.add("john");     a.add("mary");     Seq<String> b = (scala.collection.Seq<String>) a;     return b; } 

But scala.collection.JavaConverters doesn't seem to offer the possibility to convert as a Seq.

Answer 1

JavaConverters is what I needed to solve this.

import scala.collection.JavaConverters;  public Seq<String> convertListToSeq(List<String> inputList) {     return JavaConverters.asScalaIteratorConverter(inputList.iterator()).asScala().toSeq(); }