Converter tests:

Change test data files extension to "java"

j2k/tests/testData/ast/switch/nondefault.java

@@ -0,0 +1,14 @@
+//file
+public class NonDefault {
+    public static void main(String[] args) {
+
+        int value = 3;
+        String valueString = "";
+        switch (value) {
+            case 1:  valueString = "ONE";      break;
+            case 2:  valueString = "TWO";      break;
+            case 3:  valueString = "THREE";    break;
+        }
+        System.out.println(valueString);
+    }
+}