fjbg.scala

#!/bin/sh
exec scala -deprecation "$0"
!#
// ScalaのfjbgでHello,World

import ch.epfl.lamp.fjbg._

val context = new FJBGContext()
import JAccessFlags._
val jclass = context.JClass(ACC_PUBLIC,
			    "Hello",
			    "java/lang/Object",
			    JClass.NO_INTERFACES,
			    "")

// コンストラクタ生成
val initMethod = jclass.addNewMethod(ACC_PUBLIC,
                                    "<init>",
                                    JType.VOID,
                                    JType.EMPTY_ARRAY,
                                    new Array[String](0))

val init = initMethod.getCode().asInstanceOf[JExtendedCode]
init.emitALOAD_0
init.emitINVOKESPECIAL("java/lang/Object",
		       "<init>",
		       JMethodType.ARGLESS_VOID_FUNCTION)
init.emitRETURN()

// main生成
val mainMethod =
  jclass.addNewMethod(ACC_PUBLIC | ACC_STATIC,
		      "main",
		      JType.VOID,
		      Array(new JArrayType(new JObjectType("java.lang.String"))),
		      Array("args"))

val maincode = mainMethod.getCode().asInstanceOf[JExtendedCode]

maincode.emitGETSTATIC("java.lang.System", "out", new
JObjectType("java.io.PrintStream"))
maincode.emitLDC("Hello,World")
maincode.emitINVOKEVIRTUAL("java.io.PrintStream",
			   "println",
			   new JMethodType(JType.VOID, Array(new JObjectType("java.lang.String"))))
maincode.emitRETURN()

jclass.writeTo("Hello.class")