Converter tests:

Change test data files extension to "java"

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

@@ -0,0 +1,34 @@
+//file
+public class Identifier<T> {
+  private final T myName;
+  private boolean myHasDollar;
+  private boolean myNullable = true;
+
+  public Identifier(T name) {
+    myName = name;
+  }
+
+  public Identifier(T name, boolean isNullable) {
+    myName = name;
+    myNullable = isNullable;
+  }
+
+  public Identifier(T name, boolean hasDollar, boolean isNullable) {
+    myName = name;
+    myHasDollar = hasDollar;
+    myNullable = isNullable;
+  }
+
+  @Override
+  public T getName() {
+    return myName;
+  }
+}
+
+public class User {
+  public static void main() {
+     Identifier<?> i1 = new Identifier<String>("name", false, true);
+     Identifier i2 = new Identifier<String>("name", false);
+     Identifier i3 = new Identifier<String>("name");
+  }
+}