Scala example source code file (NestedClasses.scala)

This example Scala source code file (NestedClasses.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

a, a, a1, aaa, aaa1, b, bbb, bbb, c, c, d, int, int, m

The Scala NestedClasses.scala source code

//############################################################################
// Test nested classes
//############################################################################

// The following set of classes tests nasty references to "outer"
// values.

class A(pa : Int) {
  def a1 = pa;
  class B(pb : Int) {
    def b1 = pa+pb+a1;
    class C(pc : Int) extends A(b1) {
      def c1 = pc+pb+pa
    }
    val c1 = new C(13)
  }
}

trait M {
  def m1 = 1
}

class A1(x : Int) extends A(x) with M {
  class D extends B(14) {
    val c2 = new C(15);
    class E extends C(16) {
      def e1 = c1+b1+a1+m1;
      def e2 = new D();
    }
  }
}

// The following set of classes test qualified "this" and "super"
// references.

class AA {
  def m = 1;
  class BB {
    def m = 2;
    class CC {
      def m = 3;
      def am = AA.this.m;
      def bm = BB.this.m;
    }
  }
}

class AAA {
  def f = 42;
}

class BBB extends AAA {
  override def f = 24;
}

class AAA1 extends AAA {
  override def f = 111;
  class BBB1 extends BBB {
    override def f = AAA1.super.f;
  }
  class BBB2 extends BBB {
    override def f = BBB2.super.f;
  }
  class BBB3 extends BBB {
    override def f = super.f;
  }
  class BBB4 extends BBB { }
}

object Test {
  def main(args: Array[String]): Unit = {
    val a = new A1(12);
    val d = new a.D;
    val e = new d.E;
    Console.println("e.e1 = " + e.e1);

    val aa = new AA;
    val bb = new aa.BB;
    val cc = new bb.CC;
    Console.println("cc.m = " + cc.m);
    Console.println("cc.am = " + cc.am);
    Console.println("cc.bm = " + cc.bm);

    val aaa = new AAA1;
    val bbb1 = new aaa.BBB1;
    val bbb2 = new aaa.BBB2;
    val bbb3 = new aaa.BBB3;
    val bbb4 = new aaa.BBB4;
    Console.println("aaa.f = " + aaa.f);
    Console.println("bbb1.f = " + bbb1.f);
    Console.println("bbb2.f = " + bbb2.f);
    Console.println("bbb3.f = " + bbb3.f);
    Console.println("bbb4.f = " + bbb4.f);
  }
}

//############################################################################