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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.stream.*;
  7. import static java.util.Spliterator.*;
  8.  
  9. class Ideone
  10. {
  11. 	public static class Hoge implements Iterator<List<Integer>> {
  12. 		final Iterator<Integer> it;
  13. 		public Hoge(Iterator<Integer> it) {
  14. 			this.it=it;
  15. 		}
  16. 		private List<Integer> nextValue=null;
  17. 		private boolean isEof = false;
  18. 		@Override
  19. 		public boolean hasNext() {
  20. 			if (!this.isEof && this.nextValue == null) {
  21. 				if( !this.it.hasNext() ){
  22. 					this.isEof=true;
  23. 				}else{
  24. 					this.nextValue = new ArrayList<Integer>();
  25. 					for(int i=0;i<3;++i){
  26. 						if( this.it.hasNext() ){
  27. 							this.nextValue.add(this.it.next());
  28. 						}else{
  29. 							break;
  30. 						}
  31. 					}
  32. 				}
  33. 			}
  34. 			return !this.isEof;
  35. 		}
  36. 		@Override
  37. 		public List<Integer> next() {
  38. 			if( hasNext() ){
  39. 				List<Integer> result=nextValue;
  40. 				this.nextValue=null;
  41. 				return result;
  42. 			}
  43. 			throw new NoSuchElementException();
  44. 		}
  45. 	}
  46. 	public static void main (String[] args) throws java.lang.Exception
  47. 	{
  48. 		var stream = IntStream.range(0, 10);
  49. 		Spliterator<List<Integer>> spliterator = Spliterators.spliteratorUnknownSize(new Hoge(stream.iterator()), NONNULL);
  50. 		Stream<List<Integer>> result = StreamSupport.stream(spliterator, false);
  51. 		result.forEach(System.out::println);
  52. 	}
  53. }
  54.  
Success #stdin #stdout 0.07s 50504KB
comments (?)
stdin 
Standard input is empty
stdout 
[0, 1, 2]
[3, 4, 5]
[6, 7, 8]
[9]
https://ideone.com/X97Qfj
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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