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Copy pathAnCreateStream.java
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51 lines (42 loc) · 2.19 KB
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import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Collection;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
public class AnCreateStream {
public static void main(String[] args) throws IOException {
System.out.println("Test build Stream start");
//Создание стрима из значений
Stream<String> streamFromValues = Stream.of("a1", "b2", "c3");
System.out.println("streamFromValues = " + streamFromValues.collect(Collectors.toList()));
// Создание стрима из массива
String[] array = {"a1", "b2", "c3"};
Stream<String> streamFromArrays = Arrays.stream(array);
System.out.println("streamFromArrays = " + streamFromArrays.collect(Collectors.toList()));
Stream<String> streamFromArrays2 = Stream.of(array);
System.out.println("streamFromArrays2 = " + streamFromArrays2.collect(Collectors.toList()));
// Создание стрима из файла (каждая запись в файле будет отдельной строкой в стриме)
File file = new File("1.txt");
PrintWriter out = new PrintWriter(file);
out.println("a1");
out.println("b2");
out.println("c3");
out.close();
Stream<String> streamFromFiles = Files.lines(Paths.get(file.getAbsolutePath()));
System.out.println("streamFromFiles = " + streamFromFiles.collect(Collectors.toList()));
// Создание стрима из коллекции
Collection<String> collection = Arrays.asList("a1", "b2", "c3");
Stream<String> streamFromCollection = collection.stream();
System.out.println("streamFromCollection = " + streamFromCollection.collect(Collectors.toList()));
// Создание числового стрима из строки
IntStream streamFromString = "123".chars();
System.out.print("streamFromString = ");
streamFromString.forEach((e) -> System.out.print(e + ", "));
System.out.println();
}
}