core java 8

Jody Domingre Jody"How do you doing, dummy?" Are you all right, fool?First, the basic introductionJava8 not only added stream, but also added parallelstream (parallel stream). In addition to parallel streams, JAVA8 provides simple parallel functionality for normal arrays. Array sorting, generally using the Arrays.sort () method serial sorting, Java8 new Method Arrays.parallelsort () parallel sorting.Second, use1, Parallelsort ()Java

Package Demo0809.demo1;import Java.io.unsupportedencodingexception;import Java.net.urlencoder;public class Test333 { public static void Main (string[] args) throws unsupportedencodingexception {String str = urlencoder.encode ("China", "UTF-8") ; String[] s = str.substring (1). Split ("%"); StringBuffer s8 = new StringBuffer (); for (int i=0;iUsing Java to transcode a string into

. "); Ise.initcause (ISE); Throw Ise; }} return encoding; }/** * Read-ahead four bytes and check for BOM marks. Extra Bytes is unread * The stream, only BOM bytes is skipped. */protected void init () throws IOException {if (isinited) return; byte bom[] = new Byte[bom_size]; int n, unread; n = internalin.read (BOM, 0, bom.length); if ((bom[0] = = (byte) 0x00) (bom[1] = = (byte) 0x00) (bom[2] = = (byte) 0xFE) amp ; (Bom[3] = = (byte) 0

[Java Study Notes] java language core-this keyword of object-oriented, java Study NotesI. this keyword Embodiment: You can useThis keywordIn the constructor to call other constructor.Principle:Indicates the current object.This is the reference of the object to which the function belongs.Simply put, this indicates the

).The StringBuffer class is less efficient than the StringBuilder class, but is allowed to be used in multiple threads.7 input/Output 7.1 read inputInput visible: Scanner in=new Scanner (system.in);Input not visible: Console cons=system.console ();String username=cons.readline ("User name:");Char[] Passwd=cons.readpassword ("Password:");--only one line of input can be read at a time, and there is no way to read a word or a number7.2 Format outputsystem.printf ("hello,%s. Next year,you ' ll be%d

precision of 2 characters after the decimal point, for example, for 10000.0/3.0, output 3333.33, which is a space and seven characters.(2) printf can also use multiple parametersSee the explanation of the conversion character7.3 File input and outputSimilar to input, to read a file, you need to construct a scanner object with one file object, such as Scanner in = new Scanner (Paths.get ("MyFile.txt")); Of course, if the file name contains the symbol \, you need to add an extra \ T

java MyProg >log.txt 5) The processor that can change non-default catch exception Thread.setDefaultUncaughtExceptionHandler{ new Thread.UncaughtExceptionHandler(){ public void uncaughtException(Thread t, Throwable e){ //save info to file } } } 6) If you want to see the class loading process, you can invoke the-verbose flag to start the Java