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/*
* Try exception handling and finally blocks.
*
* $Id$
*/
trait Tree extends Exception;
case class Node(a: Tree, b: Tree) extends Tree;
case class Leaf(x: Int) extends Tree;
object NoExcep {
def a = true;
def b = false;
def c = true;
def method1(t: Tree) = try {
Console.println(t);
} catch {
case Node(Leaf(_), Leaf(_)) => a;
case Leaf(_) => b;
}
def method2 = try {
Console.println("Hello, world");
} catch {
case _: Error => Console.println("File error");
case t: Throwable => Console.println("Unknown error");
}
def method3 = try {
try {
Console.println("method3");
} catch {
case Node(Leaf(_), Leaf(_)) => Console.println("First one");
case Leaf(_) => Console.println("Second one");
}
} catch {
case _: Error => Console.println("File error");
case t: Exception => Console.println("Unknown error");
}
def method4 = try {
Console.println("..");
} catch {
case _ => error("..");
}
}
object Test {
def nested1: Unit = try {
try {
error("nnnnoooo");
} finally {
Console.println("Innermost finally");
}
} finally {
Console.println("Outermost finally");
}
def nested2 = try {
try {
error("nnnnoooo");
} finally {
Console.println("Innermost finally");
}
Console.println("Intermediary step");
} finally {
Console.println("Outermost finally");
}
def mixed =
try {
if (10 > 0)
throw Leaf(10);
Console.println("nooo oneeee can priiiint meee");
} catch {
case Leaf(a) => Console.println(a);
case _: Exception => Console.println("Exception occurred");
} finally {
Console.println("Finally!");
}
def method2: Unit = {
try {
if (10 > 0)
throw Leaf(10);
Console.println("nooo oneeee can priiiint meee");
} catch {
case Leaf(a) => Console.println(a);
case _: Exception => Console.println("Exception occurred");
}
try {
val a: Leaf = null;
a.x;
} catch {
case Leaf(a) => Console.println(a);
case _: NullPointerException => Console.println("Exception occurred");
}
}
def method3: Unit = try {
try {
val a: Leaf = null;
a.x;
} catch {
case Leaf(a) => Console.println(a);
}
} catch {
case npe: NullPointerException =>
Console.println("Cought an NPE");
}
def withValue1: Unit = {
val x = try {
10
} finally {
Console.println("Oh, oh");
};
Console.println(x);
}
def tryFinallyTry: Unit = {
try {
()
} finally {
try {
error("a");
} catch {
case _ => Console.println("Silently ignore exception in finally");
}
}
}
def valInFinally: Unit =
try {
} finally {
val fin = "Abc";
Console.println(fin);
};
def tryAndValInFinally: Unit =
try {
} finally {
val fin = "Abc";
try {
Console.println(fin);
} catch { case _ => () }
};
def returnInBody: Unit = try {
try {
Console.println("Normal execution...");
return
Console.println("non reachable code");
} finally {
Console.println("inner finally");
}
} finally {
Console.println("Outer finally");
}
def returnInBodySynch: Unit = try {
synchronized {
try {
Console.println("Synchronized normal execution...");
return
Console.println("non reachable code");
} finally {
Console.println("inner finally");
}
}
} finally {
Console.println("Outer finally");
}
def execute(f: => Unit) = try {
f;
} catch {
case _ => ();
}
def main(args: Array[String]): Unit = {
Console.println("nested1: ");
execute(nested1);
Console.println("nested2: ");
execute(nested2);
Console.println("mixed: ");
execute(mixed);
Console.println("withValue1:");
execute(withValue1);
Console.println("method2:");
execute(method2);
Console.println("method3:");
execute(method3);
Console.println("tryFinallyTry:");
execute(tryFinallyTry);
Console.println("valInFinally:");
execute(valInFinally);
Console.println("tryAndValInFinally");
execute(tryAndValInFinally);
Console.println("=================");
Console.println("NoExcep.method2:");
execute(NoExcep.method2);
Console.println("NoExcep.method3:");
execute(NoExcep.method3);
Console.println("NoExcep.method4:");
execute(NoExcep.method4);
Console.println("Return inside body:");
execute(returnInBody);
Console.println("Return inside synchronized body:");
execute(returnInBodySynch);
}
}
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