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  1. import java.util.Comparator;
  2. import java.util.List;
  3. import java.util.stream.Collectors;
  4. import java.util.stream.Stream;
  5.  
  6. class Ideone {
  7. 	public static void main (String[] args) {
  8. 		final AtoBConverter converter = new AtoBConverter();
  9. 		final List<B> bs = Stream.<A>of(new B(), new B(), new B(), new A())
  10. 			.map(converter::convert)
  11. 			.sorted(Comparator.comparingInt(B::getValue))
  12. 			.collect(Collectors.toList());
  13. 		System.out.println(bs);
  14. 	}
  15. }
  16.  
  17. class A {}
  18.  
  19. class B extends A {
  20. 	private static int globalValue = 5;
  21.  
  22. 	private int value;
  23.  
  24. 	public B() {
  25. 		value = globalValue--;
  26. 	}
  27.  
  28. 	public B(final int value) {
  29. 		this.value = value;
  30. 	}
  31.  
  32. 	public int getValue() {
  33. 		return value;
  34. 	}
  35.  
  36. 	@Override
  37. 	public String toString() {
  38. 		return String.format("B={value: %s}", getValue());
  39. 	}
  40. }
  41.  
  42. class AtoBConverter {
  43. 	public B convert(final A a) {
  44. 		if (a instanceof B) {
  45. 			return (B) a;
  46. 		}
  47. 		return new B(Integer.MIN_VALUE);
  48. 	}
  49. }
Success #stdin #stdout 0.08s 34704KB
comments (?)
stdin 
Standard input is empty
stdout 
[B={value: -2147483648}, B={value: 3}, B={value: 4}, B={value: 5}]
https://ideone.com/NqSuAh
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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