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Java Semaphore

package test;
/**
*
* @author openpk
*/
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
public class Main {
public static void main(String[] args) {
// Ï̳߳Ø
ExecutorService exec = Executors ......

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