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15 lines
414 B
Java
15 lines
414 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 PaternMatchingHaskellStyle {
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public append(LinkedElem(a, Elem(e)), l2) {
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return new LinkedElem<>(a, new LinkedElem<>(e, l2));
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}
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public append(LinkedElem(a, r), l2) {
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new LinkedElem<>(a, append(r, l2));
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}
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}
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