多線程的死鎖

多線程發送死鎖一般情況就是同步中嵌套同步。

其實就是

snychronized(鎖1)

{

   snychronized(鎖2)

}

而發送死鎖

/*
多線程的死鎖
同步中嵌套同步;
主要是避免寫程序發生死鎖現象。
*/
class Test11 implements Runnable
{
    private boolean flag;
    Test11(boolean flag)
    {
        this.flag = flag;
    }
    public void run()
    {
        if(flag)
        {
            while(true)
            {
                synchronized(MyLock.locka)
                {
                    System.out.println("if locka");
                    synchronized(MyLock.lockb)
                    {
                        System.out.println("if lockb");
                    }
                }
            }
        }
        else
        {
            synchronized(MyLock.lockb)
            {
                System.out.println("else lockb");
                synchronized(MyLock.locka)
                {
                    System.out.println("else locka");
                }
            }
        }
    }
}
class MyLock
{
    static Object locka = new Object();
    static Object lockb = new Object();
}
class Test_11_15
{
    public static void main(String[] args)
    {
        System.out.println("hello wolrd");
        Thread t1 = new Thread(new Test11(true));
        Thread t2 = new Thread(new Test11(false));
        t1.start();
        t2.start();
    }
}