Tags "java-stream" Result

Java 8 stream emitting a stream

I have the following file format: Text1 continuation of Text1 more continuation of Text1 Text2 continuation of Text2 more continuation of Text2 even more continuation of Text2 Continuations are marked by \n . (Newline, plus character, space as a three character string.) Continuations can be any number of lines, including 0. I want th

it1352 2 2019-05-22

Java stream reduce

I have the following example data set that I want to transform / reduce using Java stream api based on direction's value Direction int[] IN 1, 2 OUT 3, 4 OUT 5, 6, 7 IN 8 IN 9 IN 10, 11 OUT 12, 13 IN 14 to Direction int[] IN 1, 2, OUT 3, 4, 5

it1352 0 2019-05-22

Why Stream operations is duplicated with Collectors?

Please allow me to make some complaints, maybe it is boringly but I want to describe:"Why did this question will be raised?". I have answered questions is different from others here, here and here last night. After I get dig into it, I found there are many duplicated logic between Stream and Collector that violates Don't repeat yourself principle,

it1352 1 2019-05-22

Java 8 Streams FlatMap method example

I have been checking the upcoming Java update, namely: Java 8 or JDK 8. Yes, I am impatient, there's a lot of new stuff, but, there is something I don't understand, some simple code: final Stream<Integer>stream = Stream.of(1,2,3,4,5,6,7,8,9,10); stream.flatMap(); the javadocs are public <R> Stream<R> flatMap(Function<? s

it1352 0 2019-05-21

Close Java 8 Stream

If we use Java 8 Stream like list.stream().filter(....).collect(..)..... When is it closed this stream? Is it good practice that we close the stream us as the next example? Stream<String> stream = list.stream(); String result = stream.limit(10).collect(Collectors.joining("")); stream.close(); Solution It is generally not necessary to clo

it1352 1 2019-05-22

Trace java bytecode stream

I would like to see the current (bytecode) instruction stream of the JVM it is executing. After some googleing, I found that the jvm debug build offers the -XX: TraceBytecodesoption (see here). However, the mentioned link to the hotspot JVM debug build is dead and I could not find a debug build online :/ Is there another way to trace the jvm bytec

it1352 5 2019-05-21

Live audio stream java

I am implementing live streaming from MIC to java server at another PC. But I am only hearing a white noise. I have attached both client and server program Client: import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import java.net.SocketException; import java.net.UnknownHostEx

it1352 0 2019-05-22

java reader vs. stream

I was reading about Java I/O and found some interesting areas like streams, readers etc. InputStream input = new FileInputStream("input-file.txt"); int data = input.read(); while(data != -1){ data = input.read(); } I can do the same thing by using Readers as follows: Reader reader = new FileReader("input-file.txt"); int data = reader.r

it1352 0 2019-05-22

Where does official documentation say that Java's parallel stream operations use fork/join?

Here's my understanding of the Stream framework of Java 8: Something creates a source Stream The implementation is responsible for providing a BaseStream#parallel() method, which in turns returns a Stream that can run it's operations in parallel. While someone has already found a way to use a custom thread pool with Stream framework's paralle

it1352 3 2019-05-22

How to make a Stream from a DirectoryStream

When reading the API for DirectoryStream I miss a lot of functions. First of all it suggests using a for loop to go from stream to List. And I miss the fact that it a DirectoryStream is not a Stream. How can I make a Stream<Path> from a DirectoryStream in Java 8? Solution DirectoryStream is not a Stream (it's been there since Java 7, befor

it1352 0 2019-05-22