View difference between Paste ID: ipVL8ipX and

-
+/**
  * Example of an immutable pojo with a built-in builder. (getters left out for brevity)
  * Admittedly most of the ugliness comes from the syntactic cruft of Java's way of doing closures
  * and the lack of method aliases. Scala translation is here: http://pastebin.com/TASbJC5y
  * I think this kind of builder could be automatically generated by a compile-time tool - for
  * my next trick I'll write one.
  * @author twitter.com/benhardy
  */
 public final class PersonFeatures {
     public final int userId;
     public final int age;
     public final int children;
     public final int dogs;
 
     private PersonFeatures(int userId, int age, int children, int dogs) {
         this.userId = userId;
         this.age = age;
         this.children = children;
         this.dogs = dogs;
     }
 
     // give each stage of the builder only one callable method,
     // which returns the next stage
 
     public interface BuilderUserIdSpec {
         public BuilderAgeSpec userId(int v);
     }
     public interface BuilderAgeSpec {
         public BuilderChildrenSpec age(int v);
     }
     public interface BuilderChildrenSpec {
         public BuilderDogsSpec children(int v);
     }
     public interface BuilderDogsSpec {
         public BuilderFinal dogs(int v);
     }
     public interface BuilderFinal {
         public PersonFeatures build();
     }
 
     /* the builder method returns its first stage which allows you to set userId, and so on */
 
     public static BuilderUserIdSpec builder() {
         return new BuilderUserIdSpec() {
             @Override public BuilderAgeSpec userId(final int _userId) {
                  return new BuilderAgeSpec() {
                      @Override public BuilderChildrenSpec age(final int _age) {
                          return new BuilderChildrenSpec() {
                              @Override public BuilderDogsSpec children(final int _children) {
                                  return new BuilderDogsSpec() {
                                      public BuilderFinal dogs(final int _dogs) {
                                          return new BuilderFinal() {
                                             @Override public PersonFeatures build() {
                                                 return new PersonFeatures(_userId, _age, _children, _dogs);
                                             }
                                          };
                                      }
                                  };
                              }
                          };
                      }
                  };
             }
         };
     }
 
     /**
      * example usage. pretty obvious what is going on. only one way to do it. IDE will help.
      */
     public static void main(String[]args) {
         PersonFeatures person = PersonFeatures.builder().userId(4437).age(22).children(0).dogs(1).build();
     }
 }