Converter tests:

Change test data files extension to "java"

j2k/tests/testData/ast/constructors/withManyDefaultParams.java

@@ -0,0 +1,25 @@
+//file
+public class Test {
+  private final String myName;
+  private boolean a;
+  private double b;
+  private float c;
+  private long d;
+  private int e;
+  private short f;
+  private char g;
+
+  public Test() {}
+
+  public Test(String name) {
+    myName = foo(name);
+  }
+
+  static String foo(String n) {return "";}
+}
+
+public class User {
+  public static void main() {
+     Test t = new Test("name");
+  }
+}