两篇文章了解进程与线程（ 进阶篇）

一、守护线程与yield

1. 守护线程(Daemon):

   public final void setDaemon(boolean on) {
        checkAccess();
        if (isAlive()) {
            throw new IllegalThreadStateException();
        }
        daemon = on;
    }
 public final boolean isDaemon() {
        return daemon;
    }   publi