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sum(T[] array, T zero, BinaryOperator<T> accumulator)

DulcetAirman Jul 25th, 2018 (edited) 84 Never
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  1. package ch.claude_martin.foo;
  2.  
  3. import java.util.Arrays;
  4. import java.util.function.BinaryOperator;
  5.  
  6. public class SomeClass {
  7.     static class Binary {
  8.  
  9.         public static Binary ZERO = new Binary(false);
  10.         public static Binary ONE = new Binary(true);
  11.         private final boolean value;
  12.  
  13.         private Binary(boolean value) {
  14.             this.value = value;
  15.         }
  16.  
  17.         public static Binary of(boolean b) {
  18.             return b ? ONE : ZERO;
  19.         }
  20.  
  21.         public Binary add(Binary b) {
  22.             return new Binary(b.get() || value);
  23.         }
  24.  
  25.         public boolean get() {
  26.             return value;
  27.         }
  28.  
  29.         @Override
  30.         public String toString() {
  31.             return value ? "1" : "0";
  32.         }
  33.     }
  34.  
  35.     public static void main(String[] args) {
  36.         Binary[] numbers = new Binary[] { Binary.ZERO, Binary.ZERO, Binary.ONE, Binary.ZERO };
  37.         System.out.println(sum(numbers, Binary.ZERO, Binary::add));
  38.     }
  39.  
  40.     public static <T> T sum(T[] array, T zero, BinaryOperator<T> accumulator) {
  41.         return Arrays.stream(array).reduce(zero, accumulator);
  42.     }
  43. }
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