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  1. interface Collection<T> {
  2. 	void add(T t);
  3. 	void addRange(T[] ts);
  4. }
  5.  
  6. abstract class AbstractCollection<T> implements Collection<T> {
  7. 	@Override
  8. 	public void addRange(T[] ts) {
  9. 		for (T t : ts) {
  10. 			add(t);
  11. 		}
  12. 	}
  13. }
  14.  
  15. class CollectionWithCounter<T> extends AbstractCollection<T> {
  16. 	int elementsCount = 0;
  17.  
  18. 	@Override
  19. 	public void add(T t) {
  20. 		elementsCount++;
  21. 	}
  22.  
  23. 	@Override
  24. 	public void addRange(T[] ts) {
  25. 		elementsCount += ts.length;
  26. 		super.addRange(ts);
  27. 	}
  28. }
  29.  
  30. class Main {
  31. 	public static void main(String[] args) {
  32. 		CollectionWithCounter<Object> cc;
  33.  
  34. 		cc = new CollectionWithCounter<>();
  35. 		cc.add(null);
  36. 		cc.add(null);
  37. 		cc.add(null);
  38. 		System.out.println("elementsCount = " + cc.elementsCount);
  39.  
  40. 		cc = new CollectionWithCounter<>();
  41. 		cc.addRange(new Object[3]);
  42. 		System.out.println("elementsCount = " + cc.elementsCount);
  43. 	}
  44. }
Success #stdin #stdout 0.04s 711168KB
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elementsCount = 3
elementsCount = 6
https://ideone.com/72DWTf
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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