Why does LongSummaryStatistics implement IntConsumer?












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Why does LongSummaryStatistics implement IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






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    11














    Why does LongSummaryStatistics implement IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






    java java-8 java-stream







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      Why does LongSummaryStatistics implement IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






      java java-8 java-stream







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      Why does LongSummaryStatistics implement IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






      java java-8 java-stream




      java java-8 java-stream






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      edited 59 mins ago









      Boann

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      asked 6 hours ago









      mkjh

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          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer



















          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            5 hours ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            5 hours ago






          • 2




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            5 hours ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            5 hours ago






          • 1




            @AndyTurner Thanks for sharing this view. I have never thought along this perspective. I always wonder why implement IntConsumer accept(int i) when accept(long i) can take in int as well
            – mkjh
            2 hours ago











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          active

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          13














          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer



















          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            5 hours ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            5 hours ago






          • 2




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            5 hours ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            5 hours ago






          • 1




            @AndyTurner Thanks for sharing this view. I have never thought along this perspective. I always wonder why implement IntConsumer accept(int i) when accept(long i) can take in int as well
            – mkjh
            2 hours ago
















          13














          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer



















          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            5 hours ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            5 hours ago






          • 2




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            5 hours ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            5 hours ago






          • 1




            @AndyTurner Thanks for sharing this view. I have never thought along this perspective. I always wonder why implement IntConsumer accept(int i) when accept(long i) can take in int as well
            – mkjh
            2 hours ago














          13












          13








          13






          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer














          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 5 hours ago

























          answered 5 hours ago









          Andy Turner

          80.4k880134




          80.4k880134








          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            5 hours ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            5 hours ago






          • 2




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            5 hours ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            5 hours ago






          • 1




            @AndyTurner Thanks for sharing this view. I have never thought along this perspective. I always wonder why implement IntConsumer accept(int i) when accept(long i) can take in int as well
            – mkjh
            2 hours ago














          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            5 hours ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            5 hours ago






          • 2




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            5 hours ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            5 hours ago






          • 1




            @AndyTurner Thanks for sharing this view. I have never thought along this perspective. I always wonder why implement IntConsumer accept(int i) when accept(long i) can take in int as well
            – mkjh
            2 hours ago








          1




          1




          A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
          – nullpointer
          5 hours ago




          A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
          – nullpointer
          5 hours ago




          1




          1




          @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
          – Andy Turner
          5 hours ago




          @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
          – Andy Turner
          5 hours ago




          2




          2




          I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
          – Andy Turner
          5 hours ago






          I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
          – Andy Turner
          5 hours ago














          True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
          – nullpointer
          5 hours ago




          True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
          – nullpointer
          5 hours ago




          1




          1




          @AndyTurner Thanks for sharing this view. I have never thought along this perspective. I always wonder why implement IntConsumer accept(int i) when accept(long i) can take in int as well
          – mkjh
          2 hours ago




          @AndyTurner Thanks for sharing this view. I have never thought along this perspective. I always wonder why implement IntConsumer accept(int i) when accept(long i) can take in int as well
          – mkjh
          2 hours ago


















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