java 8 foreach vs for loop

3. Enhanced for Loop1) Function:Iterate over the container of the storage object2) How Jdk5 used to iterate 3) enhance the For loop iterative algebra GroupString [] arr = {"A", "B", "C"}; Static definition of an array, only when the array is first definedTraditional wayfor (int i=0; iI, in turn, represent the array's Corner labelStrings = Arr[i];System.out.println (s);}System.out.println ("-------------------------------------");In Jdk5 we can use the

each row has been assigned.//The current value--the number of the column on the previous row + the first number on the left of the column on the previous line (see image)Arr[i][j]=arr[i-1][j]+arr[i-1][j-1]; } } //Print Output for(inti = 0; i ) { for(intj = 0; J ) {System.out.print (Arr[i][j]+ "\ T");　　No Line break} System.out.println (); Line Change}}}Operation Result:1 1 1 1 2 1 1 3 3 1

happens to be fulfill mode, it will help the fulfill node to be executed as soon as possible:}Else{//Help a FulfillerSNode m =h.next;//M is the match of H if(M = =NULL)//There are no waiting personsCashead (H,NULL);//Eject Fulfill node Else{SNode mn=M.next; if(M.trymatch (h))//try MatchCashead (H, MN);//eject H and M Else //Match failedH.casnext (M,MN);//Help removing Nodes } } The above code is executed in exactly the same principle as step

LinkedList source code, there are a lot of source code is about iterator, which makes me even more puzzled: since it is a dispensable alternative to the things, why the authorities have to pay so much strength to describe it?Until recently read "effective Java", read a section about the For-each and the traditional for loop comparison, inside there is a sentence

In the Java loop structure, there is a for loop in addition to the while and Do...while, and three loops can be replaced with each other.Grammar:Execution process:Features: simpler and easier to read than the while and Do...while statement structureFor example, output 1000 times "I adore the net", use for the implement

use, can use Concurrenthashmap Use the Synchronized keyword when you really want to use it PostScript: In the previous discussion, we saw that if the old elements are copied to the new table in the HashMap, there will be no dead loop, but there will be new problems, the elements are never consistent, because the values on each thread are inconsistent, so be sure to pay attention to thread safety w

"); } } } }}}1 PackageXunhuan;2 /**3 * Use for loop to calculate 1 plus to4 * @authorNGB5 *6 */7 Public classForxunhuang {8 Public Static voidMain (string[] args) {9 intSum=0;Ten inti; One for(i=0;i){ Asum=sum+i;} -SYSTEM.OUT.PRINTLN ("The result is:" +sum); - } the}foreach statementGrammar:for (type X:obj) {statement}//type x: The

$ = array$.length, i$ = 0; i${int i = array$[i$];{System.out.println(i);}}List list = new ArrayList();list.add(1);list.add(2);list.add(3);for(java.util.Iterator i$ = list.iterator(); i$.hasNext();){String s = (String) i$.next();{System.out.println(s);}} It is clear that:1. For arrays, the Foreach loop actually uses the normal for loop2. For collections, the Foreach loop is actually an iterative iter

. casNext (m, mn); // help delete node }} The execution principle of the above Code is exactly the same as that of step 2. The only difference is that step 3 does not return data because the work in step 3 is to help other threads ship their data as soon as possible. However, the corresponding operations are not completed. Therefore, after the thread enters step 3, it enters the Large Loop body again (not given in the Code), and starts from step 1 to

= new file (FilePath);BufferedReader BufferedReader = new BufferedReader (new InputStreamReader (new FileInputStream (file), "Utf-8"));String line = null;while (line = Bufferedreader.readline ()) = null) {line = Line.trim ();Buffer.append (line);}Bufferedreader.close (); Return Removenotes (Buffer.tostring ());} /*** Remove Comments** @date 3:38:10* @author Duchaowei* @descripte* @param str* @return*/private string Removenotes (String str) {int start

("Java.lang.Thread"); 3 4 //subclasses with the Run method5var MyThread =Java.extend (Thread, {6 run:function () {7Print ("Run in Separate thread"); 8 } 9 }); Tenvar th =NewMyThread (); One Th.start (); ATh.join ();Note that the canonical practice of accessing classes from Nashorn is to use Java.type, and you can use Java.extend to extend a class.Pleasing functionalIn all respects, with the release of JDK 8