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  1. import java.util.*;
  2. import java.util.stream.*;
  3. import java.util.function.*;
  4.  
  5.  
  6. class Ideone
  7. {
  8. 	public static void main (String[] args) throws java.lang.Exception
  9. 	{
  10. 		List<Integer> list = Arrays.asList(4,3,7,1,5,2,9);
  11. 		System.out.println(list.stream().collect(COLLECT_MIN));
  12. 	}
  13.  
  14. 	static Collector<Integer, Minimum, Integer> COLLECT_MIN = new Collector<Integer, Minimum, Integer>() {
  15.             @Override
  16.             public Supplier<Minimum> supplier() {
  17.                 return Minimum::new;
  18.             }
  19.             @Override
  20.             public BiConsumer<Minimum, Integer> accumulator() {
  21.                 return Minimum::accept;
  22.             }
  23.             @Override
  24.             public BinaryOperator<Minimum> combiner() {
  25.                return Minimum::combine;
  26.             }
  27.             @Override
  28.             public Function<Minimum, Integer> finisher() {
  29.                 return Minimum::getIndex;
  30.             }
  31.             @Override
  32.             public Set<Collector.Characteristics> characteristics() {
  33.                 return Collections.emptySet();
  34.             }
  35.         };
  36.  
  37. 	static class Minimum {
  38.         int index = -1; 
  39.         int range = 0;
  40.         int value;
  41.  
  42.         public void accept(int value) {
  43.             if (range == 0 || value < this.value) {
  44.                 index = range;
  45.                 this.value = value;
  46.             }
  47.             range++;
  48.         }
  49.  
  50.         public Minimum combine(Minimum other) {
  51.             if (value > other.value) {
  52.                 index = range + other.index;
  53.                 value = other.value;
  54.             }
  55.             range += other.range;
  56.             return this;
  57.         }
  58.  
  59.         public int getIndex() {
  60.             return index;
  61.         }
  62.     }
  63. }
Success #stdin #stdout 0.19s 320576KB
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https://ideone.com/1af1EQ
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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