マルチスレッドヘルプクラス(CountDownLatch,Excutor,Executors)

3026 ワード
thread マルチスレッド さぎょう
JDK1.5いくつかの重要なスレッドヘルプクラスがあり、ラインプログラムの処理に役立ちます.
CountDownLatch,Executor,Executors,以下は彼らの簡単な使い方です
package com.tang.test;

import java.util.concurrent.CountDownLatch;

public class Job implements Runnable {
	private final CountDownLatch doneSignal;
	private final String name;

	Job(CountDownLatch doneSignal, String name) {
		this.doneSignal = doneSignal;
		this.name = name;
	}

	public void run() {
		try {
			System.out.println(name + " begin to do his work ");
			Thread.sleep(2000);// 2 , 
			System.out.println(name + " have done his work ");
		} catch (InterruptedException e) {
			e.printStackTrace();
		} finally {
			doneSignal.countDown();// -1
		}
	}
}

  
package com.tang.test;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

public class DoWork {

 private static final int N = 5;

 public static void main(String[] args) {
  CountDownLatch doneSignal = new CountDownLatch(5);// 5
  Executor e = Executors.newFixedThreadPool(2);// 1

  for (int i = 0; i < N; ++i)
   e.execute(new Job(doneSignal, " worker: "+i));// 

  try {
   doneSignal.await();// 
   System.out.println("all work have done!");
  } catch (InterruptedException e1) {
   e1.printStackTrace();
  }finally{
       System.exit(0);// 
  }
 }
}

出力結果
 worker: 0 begin to do his work 
 worker: 1 begin to do his work 
 worker: 0 have done his work 
 worker: 1 have done his work 
 worker: 2 begin to do his work 
 worker: 3 begin to do his work 
 worker: 3 have done his work 
 worker: 4 begin to do his work 
 worker: 2 have done his work 
 worker: 4 have done his work 
all work have done!

変更実行者数は5、出力結果は:
 worker: 0 begin to do his work 
 worker: 3 begin to do his work 
 worker: 1 begin to do his work 
 worker: 2 begin to do his work 
 worker: 4 begin to do his work 
 worker: 4 have done his work 
 worker: 3 have done his work 
 worker: 1 have done his work 
 worker: 2 have done his work 
 worker: 0 have done his work 
all work have done!

 
修正実行者数8、出力結果:
 worker: 0 begin to do his work 
 worker: 2 begin to do his work 
 worker: 4 begin to do his work 
 worker: 1 begin to do his work 
 worker: 3 begin to do his work 
 worker: 2 have done his work 
 worker: 4 have done his work 
 worker: 3 have done his work 
 worker: 0 have done his work 
 worker: 1 have done his work 
all work have done!

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