Converter tests:

Change test data files extension to "java"

j2k/tests/testData/ast/issues/kt-1074.java

@@ -0,0 +1,14 @@
+//file
+package demo;
+
+class Test {
+    static void subListRangeCheck(int fromIndex, int toIndex, int size) {
+        if (fromIndex < 0)
+            throw new IndexOutOfBoundsException("fromIndex = " + fromIndex);
+        if (toIndex > size)
+            throw new IndexOutOfBoundsException("toIndex = " + toIndex);
+        if (fromIndex > toIndex)
+            throw new IllegalArgumentException("fromIndex(" + fromIndex
+                    + ") > toIndex(" + toIndex + ")");
+    }
+}