java 访问线程并在 Thread 类中运行一个方法
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Access thread and run a method inside Thread class
提问by DannyF247
Here's my code:
这是我的代码：
public class DJ {
static Thread djThread = new DJPlayThread();
public static void play(){
djThread.start();
}
}
But once that thread is started, how can I run a method that is inside of the DJPlayThreadclass?
但是一旦该线程启动，我如何运行DJPlayThread类内部的方法？
Thanks.
谢谢。
回答by David Kroukamp
Here is a simple example of how to do what you ask:
这是一个简单的示例，说明如何执行您的要求：
public class ThreadControl {
public static void main(String[] args) {
MyRunnable myRunnable = new MyRunnable("MyRunnable");
Thread thread = new Thread(myRunnable);
thread.setDaemon(true);
thread.start();
myRunnable.whoAmI();//call method from within thread
try {
Thread.sleep(6000);
} catch (InterruptedException e) {
}
myRunnable.isStopped.set(true);//stop thread
}
static class MyRunnable implements Runnable {
public String threadName;
public AtomicBoolean isStopped=new AtomicBoolean(false);
public MyRunnable() {
}
public MyRunnable(String threadName) {
this.threadName = threadName;
}
public void run() {
System.out.println("Thread started, threadName=" + this.threadName + ", hashCode="
+ this.hashCode());
while (!this.isStopped.get()) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
}
System.out.println("Thread looping, threadName=" + this.threadName + ", hashCode="
+ this.hashCode());
}
}
public void whoAmI() {
System.out.println("whoAmI, threadName=" + this.threadName + ", hashCode="
+ this.hashCode());
}
}
}
回答by John Ericksen
public class DJ {
private DJPlayThread djThread = new DJPlayThread();
public void play() throws InterruptedException {
djThread.start();
Thread.sleep(10000);
djThread.stopMusic();
}
public static void main(String[] args){
try{
new DJ().play();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public class DJPlayThread extends Thread{
private AtomicBoolean running = new AtomicBoolean(true);
@Override
public void run() {
while(running.get()){
System.out.println("Playing Music");
try {
sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void stopMusic(){
//be careful about thread safety here
running.set(false);
}
}
Should print out:
应该打印出来：
Playing Music
Playing Music
Playing Music
Playing Music
Playing Music
Playing Music
Playing Music
Playing Music
Playing Music
Playing Music
Be very careful about the thread safety when exchanging information between threads. There are some weird things that happen when accessing and modifying variables across thread contexts.
在线程之间交换信息时要非常注意线程安全。在跨线程上下文访问和修改变量时会发生一些奇怪的事情。
