java 8 parallel stream

traversed. The Foreach method uses only lambda to make the code more concise relative to the previous for loop, but it is also a serial operation of each element, and there is no elevation relative to the for loop performance, whereas the previously mentioned parallel execution is due to the stream introduced in the collection. The stream definition given in the

to determine whether the original file at the end.1 Public classFileIO {2 Public Static voidMain (string[] args)throwsIOException {3String filename= "D:" +file.separator+ "Io.txt";4File file=NewFile (FileName);5InputStream inputstream=Newfileinputstream (file);6 byte[] by=New byte[1024];7 intCount=0;8 intTemp=0;9 while((Temp=inputstream.read ())!=-1){TenBy[count++]= (byte) temp; One A } - inputstream.close (); -SYSTEM.OUT.PRINTLN ("read-in length

and close the channel in}Catch(Exception e) { - System.out.println (e.tostring ()); to } + } - } the *}3. Writing files1 PackageCom.newdream.class4;2 3 ImportJava.io.BufferedReader;4 ImportJava.io.BufferedWriter;5 ImportJava.io.File;6 ImportJava.io.FileWriter;7 ImportJava.io.StringReader;8 9 Public classChariowriter {Ten One //writes text to the specified file A - - Public StaticString data=

When uploading images using jsp, you can directly change the java code to jsp. The following exception occurs during the upload: 2012-12-31 8:59:21 org. apache. catalina. core. StandardWrapperValve invoke Severe: Servlet. service () for servlet jsp threw exception Java. io. IOException: Stream closed ... Think twice ab

1 PackageHahaa;2 3 Importjava.io.FileNotFoundException;4 ImportJava.io.PrintStream;5 6 Public classha {7 Public Static voidMain (string[] args) {8 Try { 9PrintStream out =System.out; Save the original output streamTenPrintStream PS =NewPrintStream ("./log.txt");//create file output stream One A System.setout (PS); Setting up a stream with a new

The so-called input stream is to read the data in the fileSimilarly, the character input stream InputStreamReader4 Construction methods, but 2 are more commonly used:Construction Method:　A:inputstreamreader (InputStream is): reads data with default encodingB:inputstreamreader (InputStream is,string charsetname): reads data with the specified encodingA:inputstreamreader (InputStream is): reads data with defa

1. Copying multi-level folder casesRequirements: Copying multi-level foldersdata Source: E:\JavaSE\day21\code\demosDestination: E:\Analysis:A: Encapsulating the data source file B: Package destination file C: Determine if the file is a document or a folder A: is a folder Create the folder in the destination directorygets all files or folders under this file object file object iterate to get each file objectback to CB: It's a file. just copy (Byte stream