How to access scala object inside scala class in java?

Question

I have scala class like:

class A {
  object B {
    def c(d: Int) = d + 4
  }
}

How do i access function c from a java code?

Edit: assume that I can't change scala class anyhow.

Edit#2: Here is example of

public class Q {
    public void qwe() {
        A a = new A();
        a.B().c(4); //Cannot resolve method 'B' in 'A'
    }
}

Pritam Kadam · Accepted Answer · 2020-10-12 15:28:32Z

4

object B from class gets converted to public method B() which you can access as follows:

  A a = new A();
  System.out.println(a.B().c(4));

Under The Hood

A.scala

class A {
  object B {
    def c(d: Int) = d + 4
  }
}

Above class when compiled to java looks like below

scalac A.scala

javap -p A.class

public class A {
  private volatile A$B$ B$module;
  public A$B$ B();
  private final void B$lzycompute$1();
  public A();
}

answered Oct 12, 2020 at 15:28

Pritam Kadam

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2 Comments

Vasilisck Over a year ago

This doesn't work in idea. And Gradle also throw error when i try to compile it. here is example of java class ``` public class Q { public void qwe() { A a = new A(); a.B().d(4); } } ```

Pritam Kadam Over a year ago

Idea does not understand, maybe bug with intellij. You can still run and should print 8

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