Scala example source code file (protectedacc.scala)

This example Scala source code file (protectedacc.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, array, b, globalext, highlighterxxx, inner, inner, int, io, node, node, tree, tree, unit, unit

The Scala protectedacc.scala source code

//############################################################################
// Test Java interaction with scala inner classes
//############################################################################

import java.io.{BufferedReader, File, FileWriter, InputStreamReader}

/** The entry point of this test. It has to come first,
 *  before the package declarations. The parser wouldn't want it
 *  any other way.
 */
object Test {
  def main(args: Array[String]): Unit = {
    val b = new p.b.B;
    val c = new b.C;
    c.m

    val ji = new p.b.JavaInteraction(Array('a', 'b', 'c'));
    (new ji.Inner).m;
    
    (new p.b.OuterObj.Inner).m
  }
}

package p {
  package a {

    class A {
      protected val x = 10;

      protected def meth1(x: Int) = x + 1;
      protected def meth1(x: Double) = x + 1
      protected def meth2(x: Int)(y: String) = y + (x - 1);
      protected def meth3 = Array(1, 2)

      protected def f[a](x: a) = x

      def getA: this.type = this;
    }
    
    /** Test type members */
    trait HighlighterXXX {
      type Node;
      protected def highlight(node : Node) : Unit;
    }
    
    /** Test type parameters */
    abstract class PolyA[a] {
      protected def m(x: a): Unit;

      class B {

        trait Node {
          def s: String = "";
        }
        protected def tie(x: Node): Unit = { x.s; () }
      }
    }

    /** bug 853, longer path members */
    class Global {
      abstract class Tree;
    }

    trait HasNSC {
      trait GlobalExt extends Global;
      val global : GlobalExt;
      import global._;
      protected def doTyped(tree : Tree): Tree = tree;
      def mkTree : Tree;
      doTyped(mkTree);
    }
  }

  package b {
    import a._;

    /** Test interraction with Scala inherited methods and currying. */
    class B extends A {
      class C {
        def m = {
          Console.println(x);
          Console.println("meth1(1) = " + meth1(1));
          Console.println("meth1(1.0) = " + meth1(1.0));
          // test accesses from closures
          for (val x <- 1 until 3)
            Console.println("meth2(1)(1) = " + meth2(1)("prefix: "));

          Console.println("meth3 = " + meth3.getClass);

          val inc = meth2(1)_;
          Console.println("100 = " + inc("10"));

          Console.println("id(1) = " + f(1))
          Console.println("id('a') = " + f("a"))

          getA.x;
        }
      }
    }

    /** Test interaction with Java inherited protected fields. */
    class JavaInteraction(arr: Array[Char]) extends java.io.CharArrayReader(arr) {
      class Inner {
        def m = {
          Console.println("count before: " + count);
          count = count + 1;
          Console.println("count after: " + count);
        }
      }
    }

    /** Test interaction when outer is an object. */
    object OuterObj extends p.a.A {
      class Inner {
        def m = {
          Console.println(x);
          Console.println("meth1(1) = " + meth1(1));
          Console.println("meth2(1)(1) = " + meth2(1)("1"));

          val inc = meth2(1)_;
          Console.println("100 = " + inc("10"));
          
          getA.x;
        }
      }
    }
    
    trait ScalaAutoEditXXX extends HighlighterXXX {
      trait NodeImpl { 
        def self : Node;
        highlight(self);
      }
    }
    
    abstract class X[T] extends PolyA[T] {

      trait Inner extends B { 
        def self: T;
        def self2: Node;
        def getB: Inner;

        m(self)

        trait InnerInner {
          val g = getB
          g.tie(self2.asInstanceOf[g.Node])
        }
      }
    }

    trait ScalaTyperXXX extends HasNSC {
      val global : GlobalExt;
      import global._;
      trait XXX {
        def foo(tree : Tree) = doTyped(tree);
      }
    }
  }
}