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21 lines
659 B
21 lines
659 B
package com.whn.hellospring.utils;
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import java.util.Collections;
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import java.util.List;
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import java.util.Optional;
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import java.util.stream.Collector;
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public class MyOptional {
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public static <T> List<T> toList(Optional<T> option) {
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return option.
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map(Collections::singletonList).
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orElse(Collections.emptyList());
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}
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public static <R, A, T> R collect(Optional<T> option, Collector<? super T, A, R> collector) {
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final A container = collector.supplier().get();
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option.ifPresent(v -> collector.accumulator().accept(container, v));
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return collector.finisher().apply(container);
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}
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}
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