"java se 8" notes for busy people

Now only to understand java8, is not after the understanding of the point?

New programming techniques, individuals do not like the first time to follow up.

Is it more cost-effective to have practice in the community?

A little shrewd Consideration. Not much to say, on the Code.

Read the note code for "java se 8" for busy people//i hope you're too busy to read this book, a quick glance, impress//wish programming Happy public class Maintest {//chapter i, speaking lambda Expression//lambda expression similar to J Avascript function literal, can be used to replace the Java anonymous inner class//basic type (formal parameter List)->{method body}, There are many shorthand methods, no redundancy//a method specifies the interface parameters, you can pass the lambda expression to the private static V        OID C1 () {list<integer> l = arrays.aslist (1, 2, 3);        function is Self-evident//foreach behind will speak, here face ripe l.foreach (i, print (i)); In addition, the interface can now declare the default method//so, the old interface + the default abstract class of the two declarations, can be combined to declare only one interface}//chapter ii, stream simplified collection using private static void C2 () {/        /filter, which can be understood as the WHERE clause of SQL list<integer> L = arrays.aslist (1, 2, 3); Long Bignumbercount = L.stream (). filter (i-i% 2 = = 1). Count ();//incidentally demonstrates aggregation print (bignumbercount);//2//projection        , which can be understood as Sql's specified stream<integer> PlusOne = l.stream (). map (i-i+1);        Plusone.foreach (i-print (i));//2,3,4//aggregation above has been demonstrated, can be understood as SQL Count/avg/max/min syntax//collection for {1:2, 2:3, 3:4} Dictionary map<integer, integer> result = L.streaM (). Collect (collectors.tomap (i-i, i-i+1));        Result.foreach ((k,v), Print (k + ":" +v));//by the way the lambda}//fifth, which demonstrates multiple parameters, tells the new DateTime API private static void C5 () {        Date Localdate today = Localdate.now ();        Print (today);//2016-08-15 localdate birthday = localdate.of (1988, 10, 31); Print (birthday);//1988-10-31//localdate Some practical methods such as Plusdays withdayofmonth//time localtime times = Localti        Me.of (10, 31); Print (time);//10:31//localtime Some practical methods such as Plushours withminute//datetime LocalDateTime dateTime = localdate        Time.now (); Print (dateTime);//2016-08-15t21:46:01.719//date to string, using default format print (DateTimeFormatter.ISO_DATE.format (birthday))        ; String to date, using the custom format datetimeformatter myformatter = Datetimeformatter.ofpattern ("yyyy". Mm..        DD ");        Localdate fromstr = (localdate) localdate.parse ("1988..10..31", myformatter);        Print (fromstr); Oldclass with old date date = Date.valUeof (birthday);    Localdate Newclass = oldclass.tolocaldate (); }//miscellaneous improvements to private static void C8 () {//string add join String Whoishero = string.join (",", "caocao", "liu bei", "sun Quan        ");        Print (whoishero);        iterable add foreach arrays.aslist ("guan yu", "zhang fei", "zhao yun"). foreach (i-and print (i)); Easy to read the file contents path Path = Paths.get ("/juqiuwang_logs", "juqiuwang.log");//by The way, show path using try (stream<string>        lines = Files.lines (path)) {//by the way the demo automatically closes the resource Lines.foreach (s-to print);        }catch (Exception e) {throw new RuntimeException (e); }}//JAVA7 attribute private static void C9 () {//auto-close Resource's try (xx) notation in C9 has been shown//path in C9 also used//easy to read files            Content try{list<string> lines = files.readalllines (paths.get ("/juqiuwang_logs", "juqiuwang.log"));            Lines.foreach (s-to print);        Files There are also some practical methods, not}catch (Exception e) {throw new RuntimeException (e); }    } public static void main (string[] Args) {c1 ();        C2 ();        The 3rd chapter is about the application of lambda, please read//4th chapter about javafx, such as interested please read C5 ();        The 6th chapter is about concurrency, such as interested please read//7th chapter about JavaScript engine, such as interested please read C8 ();    C9 ();    } private static void print (Object O) {System.out.println (o); }}

Java SE 8 notes for busy people