delete unnecessary interface

src/org/jetbrains/jet/j2k/ast/Statements.kt

@@ -119,5 +119,5 @@ public open class DefaultSwitchLabelStatement(): Statement() {
 // Other ------------------------------------------------------------------------------------------------------
 
 public open class SynchronizedStatement(val expression: Expression, val block: Block): Statement() {
-    public override fun toKotlin() = "synchronized (" + expression?.toKotlin() + ") "+ block.toKotlin()
+    public override fun toKotlin() = "synchronized (" + expression.toKotlin() + ") "+ block.toKotlin()
 }

src/org/jetbrains/jet/j2k/visitors/ElementVisitor.kt

@@ -7,10 +7,10 @@ import org.jetbrains.jet.j2k.ast.types.Type
 import java.util.List
 import org.jetbrains.jet.j2k.ConverterUtil.isAnnotatedAsNotNull
 
-public open class ElementVisitor(val myConverter : Converter) : JavaElementVisitor(), J2KVisitor {
+public open class ElementVisitor(val myConverter : Converter) : JavaElementVisitor() {
     private var myResult : Element = Element.EMPTY_ELEMENT
 
-    public override fun getConverter() : Converter {
+    public fun getConverter() : Converter {
         return myConverter
     }
 

src/org/jetbrains/jet/j2k/visitors/J2KVisitor.java

@@ -1,28 +0,0 @@
-/*
- * Copyright 2010-2012 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.jet.j2k.visitors;
-
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.jet.j2k.Converter;
-
-/**
- * @author abreslav
- */
-public interface J2KVisitor {
-    @NotNull
-    Converter getConverter();
-}

src/org/jetbrains/jet/j2k/visitors/TypeVisitor.kt

@@ -10,7 +10,7 @@ import org.jetbrains.jet.j2k.util.AstUtil
 import java.util.LinkedList
 import java.util.List
 
-public open class TypeVisitor(private val myConverter : Converter) : PsiTypeVisitor<Type>(), J2KVisitor {
+public open class TypeVisitor(private val myConverter : Converter) : PsiTypeVisitor<Type>() {
     private var myResult : Type = EmptyType()
     public open fun getResult() : Type {
         return myResult
@@ -120,8 +120,6 @@ public open class TypeVisitor(private val myConverter : Converter) : PsiTypeVisi
         return myResult
     }
 
-    public override fun getConverter() : Converter = myConverter
-
     class object {
         private fun createQualifiedName(classType : PsiClassType) : String {
             if (classType is PsiClassReferenceType)