CODEWITHSUNDEEP
javascalagenericsscala-java-interopexistential-type
Michael Heil
Michael Heil

Reputation: 18475

Scala inheritance from Java class with generic types in constructor

How can I extends a Java class that expects a Map<?, ?> in its constructor in Scala?

The Java class looks like

public class MyJavaClass {

  private final Map<String, ?> originals;

  public MyJavaClass(Map<?, ?> originals,  Map<String, ?> configProviderProps, boolean doLog) { ... }

  public MyJavaClass(Map<?, ?> originals) {
    this(originals, Collections.emptyMap(), true);
  }
}

In Scala I was trying to do something like below but my IDE tells my that it "cannot resolve overloaded Constructor":

class myScalaClass[K <: AnyRef, V <: AnyRef](origi: Map[K, V]) extends MyJavaClass(origi) { ... }

Also tried to replace AnyRef with java.lang.Object without success. I am using Java 8 and Scala 2.12.11.

Upvotes: 0

Views: 317

Answers (1)

Dmytro Mitin
Dmytro Mitin

Reputation: 51658

Try

class myScalaClass(origi: java.util.Map[_, _]) extends MyJavaClass(origi) {  }

Upvotes: 3

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