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- import java.util.Collection;
- public abstract class Laatikko {
- public abstract void lisaa(Tavara tavara);
- public void lisaa(Collection<Tavara> tavarat) {
- for (Tavara t: tavarat) {
- lisaa(t);
- }
- }
- public abstract boolean onkoLaatikossa(Tavara tavara);
- }
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