Scala example source code file (bugs.scala)

This example Scala source code file (bugs.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, array, c, i, inner, inner, int, s, string, string, t, unit, unit

The Scala bugs.scala source code

//############################################################################
// Bugs
//############################################################################

//############################################################################
// Bug 98

object Bug98Test {
  object MyCase { def name = "mycase" }
  def test(args: Array[String]) {
    println(MyCase.name)
  }
}

//############################################################################
// Bug 120

class Bug120A(x: Int) {
  println("A")
}

trait Bug120B {
  println("B")
}
class Bug120C(x: Int)
    extends Bug120A(Bug120Test.print("one", 1))
    with Bug120B {
  println("C")
}
object Bug120Test {
  def print[A](str: String, res: A): A = {
    println(str); res
  }
  def test(args: Array[String]) {
    val c = new Bug120C(1)
    ()
  }
}

//############################################################################
// Bug 135

object Bug135Test {

  import scala.collection.immutable.TreeMap

  def test(args: Array[String]) {
    val myMap:TreeMap[Int, String] = new TreeMap
    val map1 = myMap + Pair(42, "The answer")
    println(map1.get(42))
  }

}

//############################################################################
// Bug 142

abstract class Bug142Foo1 { class Inner; def foo: Inner; foo; }
abstract class Bug142Foo2 { class Inner; def foo: Inner = {Console.println("ok"); null};}
abstract class Bug142Foo3 { type  Inner; def foo: Inner; foo; }
abstract class Bug142Foo4 { type  Inner; def foo: Inner = {Console.println("ok"); null.asInstanceOf[Inner]}; }

trait Bug142Bar1 { type  Inner; def foo: Inner = {Console.println("ok"); null.asInstanceOf[Inner]}; }
trait Bug142Bar2 { type  Inner; def foo: Inner; foo; }
trait Bug142Bar3 { class Inner; def foo: Inner = {Console.println("ok"); null}; }
trait Bug142Bar4 { class Inner; def foo: Inner; foo; }

object Bug142Test1 extends Bug142Foo1 with Bug142Bar1 { def test(args: Array[String]) {} }
object Bug142Test2 extends Bug142Foo2 with Bug142Bar2 { def test(args: Array[String]) {} }
object Bug142Test3 extends Bug142Foo3 with Bug142Bar3 { def test(args: Array[String]) {} }
object Bug142Test4 extends Bug142Foo4 with Bug142Bar4 { def test(args: Array[String]) {} }
object Bug142Test5 extends Bug142Foo1 with Bug142Bar1 { def test(args: Array[String]) {} }
object Bug142Test6 extends Bug142Foo2 with Bug142Bar2 { def test(args: Array[String]) {} }
object Bug142Test7 extends Bug142Foo3 with Bug142Bar3 { def test(args: Array[String]) {} }
object Bug142Test8 extends Bug142Foo4 with Bug142Bar4 { def test(args: Array[String]) {} }

object Bug142Test {
  def test(args:Array[String]) {
    Bug142Test1;
    Bug142Test2;
    Bug142Test3;
    Bug142Test4;
    Bug142Test5;
    Bug142Test6;
    Bug142Test7;
    Bug142Test8;
    ()
  }
}

//############################################################################
// Bug 166

object Bug166Test {
  import scala.collection.mutable.HashMap
  def test(args: Array[String]) {
    val m: HashMap[String,String] = new HashMap[String, String]
    m.update("foo","bar")
  }
}

//############################################################################
// Bug 167

class Bug167Node(bar:Int) {
  val foo = {
    val bar = 1;
    bar
  }
}

object Bug167Test {
  def test(args: Array[String]) {
    if (new Bug167Node(0).foo != 1) println("bug 167");
  }
}

//############################################################################
// Bug 168

class Bug168Foo {
  class Bar
  def foo = new Bar
}

object Bug168Test {
  def test(args: Array[String]) {
    (new Bug168Foo).foo
    ()
  }
}

//############################################################################
// Bug 174

class Bug174Foo[X] {

  class Tree
  class Node extends Tree


  val inner: Inner = new SubInner

  trait Inner {
    def test: Bug174Foo[X]#Tree
  }

  class SubInner extends Inner {
    def test = new Node
  }

}

object Bug174Test {
  def test(args: Array[String]) {
    (new Bug174Foo[Int]).inner.test
    ()
  }
}


//############################################################################
// Bug 176

trait Bug176A {
  type T;
  def foo(x: T): Int;
  def bar: T;
  def test = foo(bar);
}
trait Bug176B {
  type S <: AnyRef;
  type T = S;
  def foo(x: S): Int;
  def bar: S;
}
class Bug176C extends Bug176A with Bug176B {
  class S;
  def foo(x: S) = 1;
  def bar = new S;
}
object Bug176Test {
  def test(args: Array[String]): Unit = {
    val x: Bug176A = new Bug176C;
    Console.println(x.test);
  }
}

//############################################################################
// Bug 199

class Bug199C { object o; }
object Bug199Test {
  def test(args: Array[String]) = {
    (new Bug199C).o; ()
  }
}

//############################################################################
// Bug 213

trait Bug213Foo {
  def testAll: Unit;
  def testAllRef: String;
}

class Bug213Bar extends Bug213Foo {
  def testAll = (().asInstanceOf[Nothing] : Nothing);
  def testAllRef = ("".asInstanceOf[Null] : Null);
}

object Bug213Test {
  def test(args: Array[String]): Unit = {
    val foo: Bug213Foo = new Bug213Bar;
    try {
      foo.testAll;
    } catch {
      case e: ClassCastException =>
        Console.println("Cannot cast unit to Nothing");
    }
    try {
      foo.testAllRef;
    } catch {
      case e: ClassCastException =>
        Console.println("Cannot cast empty string to Null");
    }
    ()
  }
}

//############################################################################
// Bug 217

object Bug217Test {
  def foo[t](fun: Function0[t]): t = fun();
  def bar(x: Int): Unit = {
    foo(() => 0);
    ()
  }
  def test(args: Array[String]): Unit = bar(32);
}

//############################################################################
// Bug 222

object Bug222Test {
  def test(args:Array[String]): Unit = {
    val array: Array[String] = new Array(16);
    ()
  }
}

//############################################################################
// Bug 225

case class Bug225C();

object Bug225Test {

  def test(args: Array[String]): Unit = {
    val a = new Array[Array[Bug225C]](2);
    a(0) = new Array[Bug225C](2);
    a(0)(0) = new Bug225C();
  }
}

//############################################################################
// Bug 226

object Bug226Test {

  def id[a](xs: Array[a]): Array[a] = xs;

  def test(args: Array[String]) {
    var xs = new Array[Int](1);
    class X { xs };
    xs = id(xs);
    id(xs);
    ()
  }

}

//############################################################################
// Bug 233

object Bug233Test {
  val b: Array[String] = null;
  def test(args: Array[String]): Unit =
    Console.println(b == null);
}

//############################################################################
// Bug 250

object Bug250Test {
  def test(args: Array[String]) {
    if (true) null;
    ()
  }
}

//############################################################################
// Bug 257

object Bug257Test {
  def sayhello(): Unit = { Console.println("I should come 1st and 2nd"); };  
  def sayhi(): Unit = { Console.println("I should come last"); };

  def f1(x: Unit): Unit = ();
  def f2(x: Unit)(y: Unit): Unit = ();

  def f(x: => Unit): Unit => Unit = {
    f1(x);
    f2(x);
  }

  def test(args: Array[String]) {
    f(sayhello())(sayhi())
  }
}

//############################################################################
// Bug 266

// version - A

abstract class Bug266AFoo {
  type T >: Null <: AnyRef;
  abstract class I0 { def f(x: T): Unit; f(null); }
}

object Bug266ATest extends Bug266AFoo {
  type T = String;
  class I1 extends I0 { def f(x: String) { Console.println("hello") } }
  def test(args: Array[String]): Unit = { new I1; () }
}

// version - B

abstract class Bug266BA {
  type t
  abstract class P {
    def f(x: t): Unit
  }
}

abstract class Bug266BA1 extends Bug266BA {
  def mkP: Bug266BA1.this.P;
  val in: t;
}

trait Bug266BB extends Bug266BA {
  type t = Int;
  class P1 extends Bug266BB.this.P {
    def f(x: Int) { Console.println(x + 1) }
  }
  def mkP = new P1;
  val in = 3;
}

object Bug266BTest {
  val a: Bug266BA1 = new Bug266BA1 with Bug266BB;
  def test(args: Array[String]): Unit = a.mkP.f(a.in);
}

// main

object Bug266Test {
  def test(args: Array[String]) {
    Bug266ATest.test(args);
    Bug266BTest.test(args);
  }
}

//############################################################################
// Bug 316

class Bug316MyIterator extends Iterator[Int] {
  def hasNext = false
  def next = 42
}

object Bug316Test {
  def test(args: Array[String]): Unit =
    (new Bug316MyIterator) filter { x: Int => x == 1 };
}

//############################################################################
// Bug 328

object Bug328Test {
  def test0(f: Function1[Int,String]) {}
  def test(args: Array[String]): Unit = test0(args);
}

//############################################################################
// Bug 396

trait Bug396A {
  class I {
    def run = Console.println("A");
  }
}
trait Bug396B extends Bug396A {
  class I extends super.I {
    override def run = { super.run; Console.println("B"); }
  }
}
trait Bug396C extends Bug396A {
  trait I extends super.I {
    override def run = { super.run; Console.println("C"); }
  }
}
object Bug396Test extends Bug396B with Bug396C {
  class I2 extends super[Bug396B].I with super[Bug396C].I;
  def test(args: Array[String]): Unit = (new I2).run
}

//############################################################################
// Bug 399

object Bug399Test {
  def f(x: String): String = {
    trait C { def f: String = x; }
    class D extends C;
    trait F extends C;
    class G extends D with F;
    (new G).f
  }

  def test(args: Array[String]) {
    Console.println(f("a"));
  }
}

//############################################################################
// Main

object Test  {
  var errors: Int = 0
  def test(bug: Int, test: => Unit) {
    Console.println("<<< bug " + bug)
    try {
      test;
    } catch {
      case exception =>
        val curr: String = currentThread.toString();
        Console.print("Exception in thread \"" + curr + "\" " + exception);
        Console.println;
        errors += 1
    }
    Console.println(">>> bug " + bug)
    Console.println
  }

  def main(args: Array[String]) {

    test( 98, Bug98Test.test(args));
    test(120, Bug120Test.test(args));
    test(135, Bug135Test.test(args));
    test(142, Bug142Test.test(args));
    test(166, Bug166Test.test(args));
    test(167, Bug167Test.test(args));
    test(168, Bug168Test.test(args));
    test(174, Bug174Test.test(args));
    test(176, Bug176Test.test(args));
    test(199, Bug199Test.test(args));
    test(213, Bug213Test.test(args));
    test(217, Bug217Test.test(args));
    test(222, Bug222Test.test(args));
    test(225, Bug225Test.test(args));
    test(226, Bug226Test.test(args));
    test(233, Bug233Test.test(args));
    test(250, Bug250Test.test(args));
    test(257, Bug257Test.test(args));
    test(266, Bug266Test.test(args));
    test(316, Bug316Test.test(args));
    test(328, Bug328Test.test(args));
    test(396, Bug396Test.test(args));
    test(399, Bug399Test.test(args));

    if (errors > 0) {
      Console.println;
      Console.println(errors + " error" + (if (errors > 1) "s" else ""));
    }
  }
}

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