[GitHub] HyukjinKwon commented on issue #21455: [SPARK-24093][DStream][Minor]Make some fields of KafkaStreamWriter/In…

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HyukjinKwon commented on issue #21455: [SPARK-24093][DStream][Minor]Make some fields of KafkaStreamWriter/In…
URL: https://github.com/apache/spark/pull/21455#issuecomment-446943340
 
 
   BTW, fields in class constructors is not visible without `val`. For instance,
   
   ```scala
   class A(fieldA: String) { }
   ```
   
   generates:
   
   ```bash
   $ javap -private A.class
   Compiled from "A.scala"
   public class A {
     public A(java.lang.String);
   }
   ```
   
   FYI, when `val` is added:
   
   ```bash
   $ javap -private A.class
   Compiled from "A.scala"
   public class A {
     private final java.lang.String fieldA;
     private java.lang.String fieldA();
     public A(java.lang.String);
   }
   ```

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