在Java中,可以使用ExecutorService
和Future
來(lái)實(shí)現(xiàn)父子線程之間的任務(wù)分配
ExecutorService
實(shí)例,它將負(fù)責(zé)管理線程池。線程池的大小取決于你想要同時(shí)運(yùn)行的線程數(shù)量。int threadPoolSize = 4; // 可以根據(jù)需要調(diào)整線程池大小
ExecutorService executorService = Executors.newFixedThreadPool(threadPoolSize);
Callable
實(shí)例,該實(shí)例表示要執(zhí)行的任務(wù)。然后,使用executorService.submit()
方法將任務(wù)提交給線程池。submit()
方法將返回一個(gè)Future
對(duì)象,表示異步計(jì)算的結(jié)果。List<Future<String>> futures = new ArrayList<>();
for (int i = 0; i < 10; i++) { // 假設(shè)有10個(gè)子任務(wù)
final int taskId = i;
Callable<String> task = () -> {
// 在這里執(zhí)行子任務(wù)
System.out.println("Task " + taskId + " is running by " + Thread.currentThread().getName());
return "Task " + taskId + " completed";
};
Future<String> future = executorService.submit(task);
futures.add(future);
}
get()
方法將阻塞,直到任務(wù)完成。for (Future<String> future : futures) {
String result = future.get(); // 獲取子任務(wù)的結(jié)果,如果任務(wù)尚未完成,則阻塞
System.out.println(result);
}
ExecutorService
以釋放資源。executorService.shutdown();
將上述代碼片段組合在一起,可以實(shí)現(xiàn)一個(gè)簡(jiǎn)單的父子線程任務(wù)分配示例:
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;
public class ParentChildTaskAssignment {
public static void main(String[] args) throws InterruptedException, ExecutionException {
int threadPoolSize = 4;
ExecutorService executorService = Executors.newFixedThreadPool(threadPoolSize);
List<Future<String>> futures = new ArrayList<>();
for (int i = 0; i < 10; i++) {
final int taskId = i;
Callable<String> task = () -> {
System.out.println("Task " + taskId + " is running by " + Thread.currentThread().getName());
return "Task " + taskId + " completed";
};
Future<String> future = executorService.submit(task);
futures.add(future);
}
for (Future<String> future : futures) {
String result = future.get();
System.out.println(result);
}
executorService.shutdown();
}
}
這個(gè)示例將創(chuàng)建一個(gè)固定大小的線程池,將10個(gè)子任務(wù)分配給線程池中的線程,并等待所有任務(wù)完成。然后,它將輸出每個(gè)任務(wù)的結(jié)果。