synchronized与lock

java

synchronized 与Lock

ReentrantLock类实现了Lock，它拥有与synchronized相同的并发性和内存语义，在实现线程安全的控制中，比较常用的是ReentrantLock，可以显示加锁、释放锁。

线程创建总结

package test;

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

public class ThreadSum {
    public static void main(String[] args) {
        new MyThread1().start();

        new Thread(new MyThread2()).start();

        FutureTask<Integer> futureTask = new FutureTask<Integer>(new MyThread3());
        new Thread(futureTask).start();

        try {
            Integer integer = futureTask.get();
            System.out.println(integer);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }

}

class MyThread1 extends Thread {
    @Override
    public void run() {
        System.out.println("MyThread1");
    }
}

class MyThread2 implements Runnable {
    @Override
    public void run() {
        System.out.println("MyThread2");
    }
}

class MyThread3 implements Callable<Integer> {
    @Override
    public Integer call() throws Exception {
        System.out.println("MyThread3");
        return 100;
    }
}