多线程学习总结

JAVA中实现多线程有几种种方式，一种是集成Thread类，一种是实现Runnable接口。

但还有另外一种方式就是实现 concurrent的Collable接口，该接口和Runnable接口相似，区别就是Runnable不会有返回结果，并且不能抛出运行时异常，但是Callable可以。

Thread和Callable不适合资源共享，而实现Runnable接口的类可以资源共享。

例如继承Extends的类如下：

public class ThreadExtend extends Thread {
private int ticket = 5; //5张票

public void run() {
for (int i=0; i<=20; i++) {
if (this.ticket > 0) {
System.out.println(Thread.currentThread().getName()+ "正在卖票"+this.ticket--);
}
}
}

public static void main(String[] args) {
Thread h1 = new ThreadExtend();
Thread h2 = new ThreadExtend();
Thread h3 = new ThreadExtend();

h1.start();
h2.start();
h3.start();

}

}

实现了Runnable接口的类代码如下：

public class ThreadExtend extends Thread {
private int ticket = 2; //5张票

public void run() {
for (int i=0; i<=20; i++) {
if (this.ticket > 0) {
System.out.println(Thread.currentThread().getName()+ "正在卖票"+this.ticket--);
}
}
}

public static void main(String[] args) {
Thread h1 = new ThreadExtend();
Thread h2 = new ThreadExtend();
Thread h3 = new ThreadExtend();

h1.start();
h2.start();
h3.start();

}

}

实现了Callable接口的类代码如下:

class CThread implements Callable<String>{
 
    private int ticket = 2;  //5张票
 
    public String call() {
        for (int i=0; i<=20; i++) {
            if (this.ticket > 0) {
                System.out.println(Thread.currentThread().getName()+ "正在卖票"+this.ticket--);
            }
        }
        return "success";
    }
}
public class CallableImplement {
	public static void main(String [] args) {
		ExecutorService service = Executors.newFixedThreadPool(5);
		List<Callable<String>>jobs=new ArrayList<Callable<String>>();
		jobs.add(new CThread());
		jobs.add(new CThread());
		jobs.add(new CThread());
		try {
			List<Future<String>> dwJobThreads = service.invokeAll(jobs);
			for(Future<String> future:dwJobThreads){
				System.out.println(future.get());
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
       
    }
}