]]>
鍦ㄥ綰跨▼騫跺彂緙栫▼涓紝鏈夋椂鍊欎細閬囧埌灝嗗ぇ浠誨姟鍒嗚В鎴愬皬浠誨姟鍐嶅茍鍙戞墽琛岀殑鍦烘櫙銆?a title="Java 鐭ヨ瘑搴? target="_blank" style="color: #df3434; text-decoration: none; font-weight: bold;">Java 8鏂板鐨凢orkJoinPool寰堝ソ鐨勬敮鎸佷簡榪欎釜闂銆?/span>
ForkJoinPool鏄竴縐嶆敮鎸佷換鍔″垎瑙ｇ殑綰跨▼姹狅紝褰撴彁浜ょ粰浠栫殑浠誨姟“榪囧ぇ”錛屼粬灝變細鎸夌収棰勫厛瀹氫箟鐨勮鍒欏皢澶т換鍔″垎瑙ｆ垚灝忎換鍔★紝澶氱嚎紼嬪茍鍙戞墽琛屻?/span>
涓鑸閰嶅悎鍙垎瑙ｄ換鍔℃帴鍙orkJoinTask鏉ヤ嬌鐢紝ForkJoinTask鏈変袱涓疄鐜板畠鐨勬娊璞＄被錛歊ecursiveAction鍜孯ecursiveTask錛屽叾鍖哄埆鏄墠鑰呮病鏈夎繑鍥炲鹼紝鍚庤呮湁榪斿洖鍊箋?/span>
涓嬮潰閫氳繃鍏蜂綋浠ｇ爜錛屾潵紺鴻寖涓や釜闂錛氾紙1錛夋庝箞瀹氫箟鍙垎瑙ｇ殑浠誨姟綾?錛?錛夊浣曚嬌鐢‵orkJoinPool
package demo.thread.fork;
import java.util.Random;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.Future;
import java.util.concurrent.RecursiveTask;
public class ForkJoinPoolDemo {
public static void main(String[] args) throws InterruptedException, ExecutionException {
int arr[] = new int[100];
Random random = new Random();
int total = 0;
// 鍒濆鍖?00涓暟瀛楀厓绱?/p>
for (int i = 0; i < arr.length; i++) {
int temp = random.nextInt(100);
// 瀵規暟緇勫厓绱犺祴鍊?騫跺皢鏁扮粍鍏冪礌鐨勫兼坊鍔犲埌total鎬誨拰涓?/p>
total += (arr[i] = temp);
}
System.out.println("鍒濆鍖栨椂鐨勬誨拰=" + total);
// 鍒涘緩鍖呭惈Runtime.getRuntime().availableProcessors()榪斿洖鍊間綔涓轟釜鏁扮殑騫惰綰跨▼鐨凢orkJoinPool
ForkJoinPool forkJoinPool = new ForkJoinPool();
// 鎻愪氦鍙垎瑙ｇ殑PrintTask浠誨姟
Future<Integer> future = forkJoinPool.submit(new SumTaskDemo(arr, 0,
arr.length));
System.out.println("璁＄畻鍑烘潵鐨勬誨拰=" + future.get());
// 鍏抽棴綰跨▼姹?/p>
forkJoinPool.shutdown();
}
}
// RecursiveTask涓篎orkJoinTask鐨勬娊璞″瓙綾伙紝鏈夎繑鍥炲肩殑浠誨姟
class SumTaskDemo extends RecursiveTask<Integer> {
private static final long serialVersionUID = 4033241174438751063L;
// 姣忎釜"灝忎換鍔?鏈澶氬彧鎵撳嵃20涓暟
private static final int MAX = 20;
private int arr[];
private int start;
private int end;
SumTaskDemo(int arr[], int start, int end) {
this.arr = arr;
this.start = start;
this.end = end;
}
@Override
protected Integer compute() {
int sum = 0;
// 褰揺nd-start鐨勫煎皬浜嶮AX鏃跺欙紝寮濮嬫墦鍗?/p>
if ((end - start) <= MAX) {
for (int i = start; i < end; i++) {
sum += arr[i];
}
return sum;
} else {
System.err.println("=====浠誨姟鍒嗚В======");
// 灝嗗ぇ浠誨姟鍒嗚В鎴愪袱涓皬浠誨姟
int middle = (start + end) >>>1;
SumTaskDemo left = new SumTaskDemo(arr, start, middle);
SumTaskDemo right = new SumTaskDemo(arr, middle, end);
// 騫惰鎵ц涓や釜灝忎換鍔?/p>
left.fork();
right.fork();
// 鎶婁袱涓皬浠誨姟绱姞鐨勭粨鏋滃悎騫惰搗鏉?/p>
return left.join() + right.join();
}
}
}
渚嬪瓙浜岋細
package demo.thread.fork;
import java.util.Random;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveAction;
import java.util.concurrent.TimeUnit;
/**
* @author lin
*
*/
public class ForkJoinPoolDemo2 {
public static void main(String[] args) throws Exception {
// 鍒涘緩涓涓敮鎸佸垎瑙ｄ換鍔＄殑綰跨▼姹燜orkJoinPool
ForkJoinPool pool = new ForkJoinPool(4);
myTask task = new myTask(60);
pool.submit(task);
pool.awaitTermination(10, TimeUnit.SECONDS);// 絳夊緟20s錛岃瀵熺粨鏋?/p>
pool.shutdown();
}
}
/**
* 瀹氫箟涓涓彲鍒嗚В鐨勭殑浠誨姟綾伙紝緇ф壙浜哛ecursiveAction鎶借薄綾?蹇呴』瀹炵幇瀹冪殑compute鏂規硶
*/
class myTask extends RecursiveAction {
private static final long serialVersionUID = 1L;
// 瀹氫箟涓涓垎瑙ｄ換鍔＄殑闃堝?#8212;—50,鍗充竴涓換鍔℃渶澶氭壙鎷?0涓伐浣滈噺
int THRESHOLD = 20;
// 浠誨姟閲?/p>
int task_Num = 0;
myTask(int Num) {
this.task_Num = Num;
}
@Override
protected void compute() {
if (task_Num <= THRESHOLD) {
System.out.println(Thread.currentThread().getName() + "鎵挎媴浜?
+ task_Num + "浠藉伐浣?);
/*try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}*/
} else {
// 闅忔満瑙ｆ垚涓や釜浠誨姟
Random m = new Random();
int x = m.nextInt(50);
myTask left = new myTask(x);
myTask right = new myTask(task_Num - x);
left.fork();
right.fork();
}
}
}
]]>
鍏紡錛?br />
涓婇潰鐨勫お澶嶆潅錛屾潵涓畝鍗曠殑錛?br />
浣跨敤JAVA姹傚疄闄呭埄鐜?/p>
Java浠ｇ爜 
- /**
- * 瀹為檯鍒╃巼娉?/span>
- * @author Bean(mailto:mailxbs@126.com)
- * @param a 鐜板?/span>
- * @param b 騫撮噾
- * @param c 鏈熸暟
- * @param cnt 榪愮畻嬈℃暟
- * @param ina 璇樊浣嶆暟
- * @return 鍒╃巼
- */
- public static double rate(double a,double b,double c,int cnt,int ina){
- double rate = 1,x,jd = 0.1,side = 0.1,i = 1;
- do{
- x = a/b - (Math.pow(1+rate, c)-1)/(Math.pow(rate+1, c)*rate);
- if(x*side>0){side = -side;jd *=10;}
- rate += side/jd;
- }while(i++<cnt&&Math.abs(x)>=1/Math.pow(10, ina));
- if(i>cnt)return Double.NaN;
- return rate;
- }
- public static void main(String agrs[]) {
- {
- Double 鐜板?nbsp;= 7944760.00d;
- Double 騫撮噾 = 186627.21d;
- Double 鏈熸暟 = 48d;
- //璁＄畻200嬈★紝姣擡xcel20嬈¤綺劇‘錛岃宸簿紜埌灝忔暟鐐瑰悗10浣?/span>
- System.out.println(rate(鐜板?騫撮噾,鏈熸暟,200,10));
- }
- }
]]>
]]>
]]>
]]>
3銆佸湪浣犲畨瑁匨yeclipe鐨勭洰褰曚腑Common\plugins\com.genuitec.eclipse.core_9.0.0.me201103181703.jar錛?br />鐢ㄥ帇緙╁伐鍏鋒墦寮錛學inRAR鎴?-zip錛屾垜鐢ㄧ殑鏄疻inMount錛屽啀鍒癱om\genuitec\eclipse\core鐩綍涓嬶紝
鏇挎崲publicKey.bytes鏂囦歡錛?濡傚浘
4銆佷慨鏀筰ni閰嶇疆鏂囦歡銆傚湪MyEclipse 9.0\myeclipse.ini錛岀敤璁頒簨鏈紑寮Myeclipse.ini錛屽湪鏈鍚庡姞涓婁笅闈袱鍙?/span>
![Myeclipse Enterprise Workbench 9.0鐮磋В鏂規硶 - leruge - 澶у鐢熷垬甯? src=]()
5銆佹墦寮Myeclipse錛屽湪“preferences”錛堝嵆鍙傛暟閫夋嫨涓級鎵懼埌濡傚浘鎵紺?/span>
7銆侀殢渚垮啓涓涓敤鎴峰悕錛堟垜鐨勬槸leruge錛夛紝鐐瑰嚮涓嬮潰涓や釜鎸夐挳錛屽皢鐢熸垚鐨勪笢瑗垮啓涓婂氨琛屼簡銆?/span>
![Myeclipse Enterprise Workbench 9.0鐮磋В鏂規硶 - leruge - 澶у鐢熷垬甯? src=]()
-Dgenuitec.honorDevMode=true
-Dosgi.dev=true
7銆侀殢渚垮啓涓涓敤鎴峰悕錛堟垜鐨勬槸leruge錛夛紝鐐瑰嚮涓嬮潰涓や釜鎸夐挳錛屽皢鐢熸垚鐨勪笢瑗垮啓涓婂氨琛屼簡銆?/span>
8銆佸埌姝yeclipse Enterprise Workbench 9.0鐮磋В瀹屾瘯銆?/span>
瑁咃細http://leruge.blog.163.com/blog/static/166845995201192474724627/
瑁咃細http://leruge.blog.163.com/blog/static/166845995201192474724627/
]]>