public class b{
    public Long a(Long next_time){}
    public Long b(Long next_time){}
    public Long c(Long next_time){}
    public Long d(Long next_time){}
}

上面的B类中的a,b,c,d4个方法通过多线程方式同时执行。

public class Main implements Runnable {

    public void run()
    {
        String method = Thread.currentThread().getName();
        Long next_time = 30000L;
        if(method.equals("a"))
        {
            while (true)
            {
                lottery b = new b();
                next_time = b.a();
                Thread.sleep(next_time);
            }
        } else if(method.equals("b"))
        {
            while (true)
            {
                lottery b = new b();
                next_time = b.b();
                Thread.sleep(next_time);
            }
        }else if(method.equals("c"))
        {
            while (true)
            {
                lottery b = new b();
                next_time = b.c();
                Thread.sleep(next_time);
            }
        }else if(method.equals("d"))
        {
            while (true)
            {
                lottery b = new b();
                next_time = b.d();
                Thread.sleep(next_time);
            }
        }
    }
    public static void main(String[] args) {
        new Thread(new Main(),"a").start();
        new Thread(new Main(),"b").start();
        new Thread(new Main(),"c").start();
        new Thread(new Main(),"d").start();
    }
}

上面的代码比较简单。就是并发无限执行b类里面的4个方法。通过数据库日志发现经常执行B类里面的某一个方法到某一行代码以后就不会往下面执行代码了。要通过重启jar才可以。要怎么设置超时或者其他方法一直无限运行。