convert .length on arrays to .size

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

@@ -219,17 +219,21 @@ public open class ExpressionVisitor(converter: Converter): StatementVisitor(conv
         val isThis: Boolean = isThisExpression(expression!!)
         val isNullable: Boolean = getConverter().typeToType(expression?.getType()).nullable
         val className: String = getClassNameWithConstructor(expression!!)
-        var identifier: Expression = Identifier(expression?.getReferenceName()!!, isNullable)
+        val referencedName = expression?.getReferenceName()!!
+        var identifier: Expression = Identifier(referencedName, isNullable)
         val __: String = "__"
+        val qualifier = expression?.getQualifierExpression()
         if (hasReceiver){
-            identifier = CallChainExpression(Identifier(__, false), Identifier(expression?.getReferenceName()!!, isNullable))
+            identifier = CallChainExpression(Identifier(__, false), Identifier(referencedName, isNullable))
+        }
+        else if (insideSecondaryConstructor && isThis) {
+            identifier = Identifier("val __ = " + className)
+        }
+        else if (qualifier != null && qualifier.getType() is PsiArrayType && referencedName == "length") {
+            identifier = Identifier("size", isNullable)
         }
-        else
-            if (insideSecondaryConstructor && isThis) {
-                identifier = Identifier("val __ = " + className)
-            }
 
-        myResult = CallChainExpression(getConverter().expressionToExpression(expression?.getQualifierExpression()), identifier)
+        myResult = CallChainExpression(getConverter().expressionToExpression(qualifier), identifier)
     }
 
     public override fun visitSuperExpression(expression: PsiSuperExpression?): Unit {

tests/testData/ast/issues/file/arrayLength.jav

@@ -0,0 +1,5 @@
+class Test {
+  public static int foo(String[] args) {
+    return args.length;
+  }
+}

tests/testData/ast/issues/file/arrayLength.kt

@@ -0,0 +1,7 @@
+open class Test() {
+class object {
+public open fun foo(args : Array<String?>?) : Int {
+return args?.size!!
+}
+}
+}