import org.junit.Test

class ScalaTest {
  @Test
  def test1() {
    println("test1")
  }

  @Test(timeout = 1L)
  def test2() {
    println("test2")
  }
}

@deprecated
class Test {
  @deprecated
  val t = "unuse"
  
  @deprecated(message = "unuse")
  def hello() {
      println("hello")
  }   
} 

@deprecated
object Test extends App {
  val t = new Test()
  t.hello 
}

略

import annotation.varargs
class sumTest {
  @varargs
  def sum(nums: Int*): Int = {
    nums.sum
  }
}

public class Hello {
    public static void main(String[] args) {
        sumTest t = new sumTest();
        System.out
 
.println(t.sum(1, 3, 4));
    }
}

import io.Source

object FileTest {
  def read(path: String): String = {
    Source.fromFile(path).mkString
  }
}

public class FileRead {
    public static void main(String[] args) {
        System.out.println(FileTest.read("/tmp/a.txt"));
    }
}

import scala.actors.Actor
class T1(obj: Obj) extends Actor {
  def act() {
    println("T1 is waiting")
    Thread.sleep(5000)
    obj.flag = true
    println("T1 set flag = true")
  }
}

class T2(obj: Obj) extends Actor {
  def act() {
    var f = true
    while (f) {
      if (obj.flag) {
        println("T2 is end")
        f = false
      } else {
        println("T2 is waiting")
        Thread.sleep(1000)
      }
    }
  }
}

class Obj {
  @volatile 
  var flag: Boolean = false
}

object Test {
  def main(args : Array[String]) {
    val obj = new Obj()
    val t1 = new T1(obj)
    val t2 = new T2(obj)
    t1.start()
    t2.start()
  }
}

object SpecTest {
  def allDifferent[@specialized T](x:T,y:T,z:T) = x != y && x!= z && y != z
}

[root@devswan scala]# javap ../../../target/scala-2.10/classes/SpecTest\$.class 
Compiled from "spec.scala"
public final class SpecTest$ {
  public static final SpecTest$ MODULE$;
  public static {};
  public <T extends java/lang/Object> boolean allDifferent(T, T, T);
  public boolean allDifferent$mZc$sp(boolean, boolean, boolean);
  public boolean allDifferent$mBc$sp(byte, byte, byte);
  public boolean allDifferent$mCc$sp(char, char, char);
  public boolean allDifferent$mDc$sp(double, double, double);
  public boolean allDifferent$mFc$sp(float, float, float);
  public boolean allDifferent$mIc$sp(int, int, int);
  public boolean allDifferent$mJc$sp(long, long, long);
  public boolean allDifferent$mSc$sp(short, short, short);
  public boolean allDifferent$mVc$sp(scala.runtime.BoxedUnit, scala.runtime.BoxedUnit, scala.runtime.BoxedUnit);
}

javap -classpath /path/to/scala/lib/scala-library.jar scala.collection.immutable.Range

......
trait Function1[@specialized(scala.Int, scala.Long, scala.Float, scala.Double/*, scala.AnyRef*/) -T1, @specialized(scala.Unit, scala.Boolean, scala.Int, scala.Float, scala.Long, scala.Double/*, scala.AnyRef*/) +R] extends AnyRef { self =>
  /** Apply the body of this function to the argument.
   *  @return   the result of function application.
   */
  def apply(v1: T1): R
......

...... 
@inline final override def foreach[@specialized(Unit) U](f: Int => U) {
    if (validateRangeBoundaries(f)) {
      var i = start
      val terminal = terminalElement
      val step = this.step
      while (i != terminal) {
        f(i)
        i += step
      }
    }
  }
......

object Test {
  def factorial(n: Int): Int = {
    assert(n > 0)
    n
  }

  def main(args: Array[String]) {
    factorial(-1)
  }
}

Exception in thread "main" java.lang.AssertionError: assertion failed
        at scala.Predef$.assert(Predef.scala:165)
        at Test$.factorial(Test.scala:6)
        at Test$.main(Test.scala:11)
        at Test.main(Test.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

-Xelide-below 2011

......
public int factorial(int);
  Code:
   0:   getstatic       #19; //Field scala/Predef$.MODULE$:Lscala/Predef$;
   3:   iload_1
   4:   iconst_0
   5:   if_icmple       12
   8:   iconst_1
   9:   goto    13
   12:  iconst_0
   13:  invokevirtual   #23; //Method scala/Predef$.assert:(Z)V
   16:  iload_1
   17:  ireturn
......