package java8stream; import java.util.Optional; import java.util.stream.Stream; /** * @web http://java-buddy.blogspot.com/ */ public class Java8Stream { static String lyrics = "Hello darkness, my old friend,\n" + "I've come to talk with you again,\n" + "Because a vision softly creeping,\n" + "Left its seeds while I was sleeping,\n" + "And the vision that was planted in my brain\n" + "Still remains\n" + "Within the sound of silence."; public static void main(String[] args) { System.out.println("--- lyrics ---"); System.out.println(lyrics); System.out.println("--- Some examples of using Stream ---"); //print all element in Stream<String> Stream.of(lyrics.split("[\\P{L}]+")) .forEach((String element) -> System.out.println(element)); //count number of element in Stream System.out.println("count of words = " + Stream.of(lyrics.split("[\\P{L}]+")).count()); System.out.println("--- Sorted Stream ---"); Stream<String> sortedStream = Stream.of(lyrics.split("[\\P{L}]+")).sorted(); sortedStream.forEach((String element) -> System.out.println(element)); System.out.println("--- Convert to lower case ---"); Stream<String> sortedStreamLower = Stream.of(lyrics.split("[\\P{L}]+")) .map(String::toLowerCase); sortedStreamLower.forEach((String element) -> System.out.println(element)); System.out.println("--- Find the maximum, ignore case, in Stream<String> ---"); Optional<String> max = Stream.of(lyrics.split("[\\P{L}]+")) .max(String::compareToIgnoreCase); if(max.isPresent()){ System.out.println("max = " + max.get()); } System.out.println("--- Find the first word starts with 'c' ---"); Optional<String> startsWithC = Stream.of(lyrics.split("[\\P{L}]+")) .filter(s->s.startsWith("c")).findFirst(); if(startsWithC.isPresent()){ System.out.println("the first word starts with 'c' = " + startsWithC.get()); } } }
Thursday, April 17, 2014
Some examples of using Stream of Java 8
This post show some example of using Stream<String> of Java 8; such as splite String to Stream<String> of words, print all element in Stream, count number of element, sort Stream, convert to lower case, find the maximum, and Find the first word starts with.
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