32 lines
989 B
Java
32 lines
989 B
Java
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package com.baeldung.jupiter;
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import org.junit.jupiter.api.Test;
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import java.util.function.Supplier;
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import java.util.regex.Pattern;
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import java.util.stream.Collectors;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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class Spring5Java8NewFeaturesIntegrationTest {
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@FunctionalInterface
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public interface FunctionalInterfaceExample<Input, Result> {
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Result reverseString(Input input);
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}
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public class StringUtils {
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FunctionalInterfaceExample<String, String> functionLambdaString = s -> Pattern.compile(" +")
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.splitAsStream(s)
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.map(word -> new StringBuilder(word).reverse())
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.collect(Collectors.joining(" "));
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}
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@Test
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void givenStringUtil_whenSupplierCall_thenFunctionalInterfaceReverseString() throws Exception {
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Supplier<StringUtils> stringUtilsSupplier = StringUtils::new;
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assertEquals(stringUtilsSupplier.get().functionLambdaString.reverseString("hello"), "olleh");
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}
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}
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