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17 lines
587 B
Java
17 lines
587 B
Java
sealed interface List<T> permits LinkedElem, Elem {}
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public record LinkedElem<T>(T a, List<T> l) implements List<T> {}
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public record Elem<T>(T a) implements List<T> {}
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public class SwitchAppend {
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public append(l1, l2) {
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return switch(l1) {
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case LinkedElem(a, Elem(e)) -> new LinkedElem<>(a, new LinkedElem<>(e, l2));
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case LinkedElem(a, r) -> new LinkedElem<>(a, append(r, l2));
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//Alternativ:
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//case LinkedElem(a, LinkedElem(e, r)) -> new LinkedElem<>(a, append(new LinkedElem(e, r), l2));
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default -> null;
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};
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}
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}
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