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修改Java并发守护线程部分

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将守护线程创建的方式叙述的更加严谨，只有在线程启动之前设置为setDaemon(true)才会有效，因为有公司面试会问到守护线程的创建方式
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Sanarous 2019-06-20 20:13:01 +08:00 committed by GitHub
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notes/Java 并发.md
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@ -223,12 +223,13 @@ public static void main(String[] args) {
main() 属于非守护线程。 main() 属于非守护线程。
使用 setDaemon() 方法将一个线程设置为守护线程。 在线程启动之前使用 setDaemon() 方法可以将一个线程设置为守护线程。
```java ```java
public static void main(String[] args) { public static void main(String[] args) {
Thread thread = new Thread(new MyRunnable()); Thread thread = new Thread(new MyRunnable());
thread.setDaemon(true); thread.setDaemon(true);
thread.start();
} }
``` ```