Java 多线程基础实现（Callable）

Runnble接口的run()方法不能返回操作结果。为了解决这一问题提供了新接口java.util.concurrent.Callable接口

@FunctionalInterface

public interface Callable<V>{

    public V call（）throws Exception;

}

在FutureTask类下有个构造方法:public FutureTask（Callable<V> callable）

范例：

import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

class MyThread implements Callable<String> {
	private int ticket = 6;

	@Override
	public String call() throws Exception {
		for (int i = 0; i < 7; i++) {
			if (this.ticket > 0) {
				System.out.println("Ticket=" + this.ticket--);
			}
		}
		return "卖完了";
	}
}

public class Demo {
	public static void main(String[] args) throws Exception {
		MyThread mt1 = new MyThread();
		MyThread mt2 = new MyThread();
		FutureTask<String> ft1 = new FutureTask<>(mt1);
		FutureTask<String> ft2 = new FutureTask<>(mt2);
		new Thread(ft1).start();
		System.out.println(ft1.get());
		new Thread(ft2).start();
		System.out.println(ft2.get());
	}
}