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functional work

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This commit is contained in:
Eugen Paraschiv 2013-10-30 13:00:28 +02:00
parent c257a33969
commit 625f4e126d
1 changed files with 17 additions and 3 deletions
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20
guava/src/test/java/org/baeldung/guava/GuavaFunctionalExamplesTest.java
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@ -98,7 +98,7 @@ public class GuavaFunctionalExamplesTest {
} }
} }
// char predicates // other predicates
@Test @Test
public final void when_thenCorrect() { public final void when_thenCorrect() {
@ -126,7 +126,7 @@ public class GuavaFunctionalExamplesTest {
@Test @Test
public final void whenChainingPredicatesAndFunctions_thenCorrectResults() { public final void whenChainingPredicatesAndFunctions_thenCorrectResults() {
final List<Integer> numbersToSort = Arrays.asList(2, 1, 11, 100, 8, 14); final List<Integer> numbers = Arrays.asList(2, 1, 11, 100, 8, 14);
final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() { final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
@Override @Override
public final boolean apply(final Integer number) { public final boolean apply(final Integer number) {
@ -140,10 +140,24 @@ public class GuavaFunctionalExamplesTest {
} }
}; };
final FluentIterable<Integer> powerOfTwoOnlyForEvenNumbers = FluentIterable.from(numbersToSort).filter(acceptEvenNumber).transform(powerOfTwo); final FluentIterable<Integer> powerOfTwoOnlyForEvenNumbers = FluentIterable.from(numbers).filter(acceptEvenNumber).transform(powerOfTwo);
assertThat(powerOfTwoOnlyForEvenNumbers, contains(4, 10000, 64, 196)); assertThat(powerOfTwoOnlyForEvenNumbers, contains(4, 10000, 64, 196));
} }
@Test
public final void whenUsingFunctionComposition_thenCorrectResults() {
final List<Integer> numbers = Arrays.asList(2, 3);
final Function<Integer, Integer> powerOfTwo = new Function<Integer, Integer>() {
@Override
public final Integer apply(final Integer input) {
return (int) Math.pow(input, 2);
}
};
final List<Integer> result = Lists.transform(numbers, Functions.compose(powerOfTwo, powerOfTwo));
assertThat(result, contains(16, 81));
}
// Set+Function => Map // Set+Function => Map
/** /**