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sproshev
suggested changes
May 1, 2018
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| public abstract boolean run(T obj); | ||
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| static public Predicate ALWAYS_TRUE = new Predicate() { |
| } | ||
| }; | ||
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| static public Predicate ALWAYS_FALSE = new Predicate() { |
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generic? надо написать так, чтобы оба предиката можно было использовать без warning'ов
| assertEquals(out1, 45); | ||
| assertEquals(out2, -45); | ||
| } | ||
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не проверяются ? extends ..., ? super ...
| @Test | ||
| public void testRun() { | ||
| assertTrue(100 == sq.run(10)); | ||
| assertTrue(100 == sq.run(-10)); |
| @Test | ||
| public void testCompose() { | ||
| Function1<Integer, Integer> tmp = sq.compose(inc); | ||
| assertTrue(5 == tmp.run(2)); |
sproshev
approved these changes
May 27, 2018
| public class Collections { | ||
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| public static <A, R> Collection<R> map(Function1<? super A, ? extends R> func, | ||
| Collection<? extends A> input) { |
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цитирую:
Cоздать класс Collections со следующими статическими методами, оперирующими Iterable, Function1, Function2 и Predicate:
map— принимаетfиa, применяетfк каждому элементуa_iи возвращает список[f(a_1), ..., f(a_n)]
и т.д.
| public static <A, R> R foldr(Function2<? super A, ? super R, ? extends R> func, | ||
| Collection<? extends A> input, | ||
| R init) { | ||
| List<A> elem = new ArrayList<>(); |
| R init) { | ||
| List<A> elem = new ArrayList<>(); | ||
| elem.addAll(input); | ||
| ListIterator<A> it = elem.listIterator(); |
| public void testRun(){ | ||
| assertTrue(42 == magic.run(2.0, "asdf")); | ||
| assertTrue(5 == minus.run(2, -3)); | ||
| assertTrue(5 == plus.run(2, 3)); |
| assertEquals(true, even.run(2)); | ||
| assertEquals(false, even.run(3)); | ||
| assertEquals(true, one.run("a")); | ||
| assertEquals(false, one.run("abacaba")); |
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