object内での private と private[this] の違い

A$.java

import scala.ScalaObject;

public final class A$
    implements ScalaObject
{

    private int b()
    {
        return b;
    }

    private A$()
    {
    }

    public static final A$ MODULE$ = this;
    private final int a = 1;
    private final int b = 2;

    static 
    {
        new A$();
    }
}

A.java

public final class A
{
}

A.scala

object A{

  private[this] val a = 1
  
  private val b = 2
  
}