Java8-Stream-No.05

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import java.util.Arrays;import java.util.List;import java.util.function.Supplier;import java.util.stream.Stream;public class Streams5 {    public static void main(String[] args) {        List<String> strings =            Arrays.asList("d2", "a2", "b1", "b3", "c");//        test1(strings);//        test2(strings);//        test3(strings);//        test4(strings);//        test5(strings);//        test6(strings);//        test7(strings);        test8(strings);    }    private static void test8(List<String> stringCollection) {        Supplier<Stream<String>> streamSupplier =            () -> stringCollection                .stream()                .filter(s -> s.startsWith("a"));        streamSupplier.get().anyMatch(s -> true);        streamSupplier.get().noneMatch(s -> true);    }    // stream has already been operated upon or closed    private static void test7(List<String> stringCollection) {        Stream<String> stream = stringCollection            .stream()            .filter(s -> s.startsWith("a"));        stream.anyMatch(s -> true);        stream.noneMatch(s -> true);    }    // short-circuit    private static void test6(List<String> stringCollection) {        stringCollection            .stream()            .map(s -> {                System.out.println("map:      " + s);                return s.toUpperCase();            })            .anyMatch(s -> {                System.out.println("anyMatch: " + s);                return s.startsWith("A");            });    }    private static void test5(List<String> stringCollection) {        stringCollection            .stream()            .filter(s -> {                System.out.println("filter:  " + s);                return s.toLowerCase().startsWith("a");            })            .sorted((s1, s2) -> {                System.out.printf("sort:    %s; %s\n", s1, s2);                return s1.compareTo(s2);            })            .map(s -> {                System.out.println("map:     " + s);                return s.toUpperCase();            })            .forEach(s -> System.out.println("forEach: " + s));    }    // sorted = horizontal    private static void test4(List<String> stringCollection) {        stringCollection            .stream()            .sorted((s1, s2) -> {                System.out.printf("sort:    %s; %s\n", s1, s2);                return s1.compareTo(s2);            })            .filter(s -> {                System.out.println("filter:  " + s);                return s.toLowerCase().startsWith("a");            })            .map(s -> {                System.out.println("map:     " + s);                return s.toUpperCase();            })            .forEach(s -> System.out.println("forEach: " + s));    }    private static void test3(List<String> stringCollection) {        stringCollection            .stream()            .filter(s -> {                System.out.println("filter:  " + s);                return s.startsWith("a");            })            .map(s -> {                System.out.println("map:     " + s);                return s.toUpperCase();            })            .forEach(s -> System.out.println("forEach: " + s));    }    private static void test2(List<String> stringCollection) {        stringCollection            .stream()            .map(s -> {                System.out.println("map:     " + s);                return s.toUpperCase();            })            .filter(s -> {                System.out.println("filter:  " + s);                return s.startsWith("A");            })            .forEach(s -> System.out.println("forEach: " + s));    }    private static void test1(List<String> stringCollection) {        stringCollection            .stream()            .filter(s -> {                System.out.println("filter:  " + s);                return true;            })            .forEach(s -> System.out.println("forEach: " + s));    }}
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