It's arguably much
easier to reason about (and probably implement) a Thread that simply executes
its given task exactly once and is then permanently finished. To restart threads
would require a more complex view on what state a program was in at a given time.
So unless you can come up with a specific reason why restarting
a given Thread is a better option than just creating a new one with
the same Runnable.
class ThreadExample {
public static void main(String[] args){
Thread myThread = new Thread() {
public void run() {
for(int i=0; i<3; i++) {
try {
sleep(100);
} catch(InterruptedException ie) {
}
System.out.print(i+", ");
}
System.out.println("done.");
}
};
myThread.start();
try {
Thread.sleep(500);
} catch(InterruptedException ie) {
}
System.out.println("Now
myThread.run() should be done.");
// <-- causes java.lang.IllegalThreadStateException
myThread.start();
}
}
Output:
0, 1, 2, done.
Now myThread.run() should be done.
Exception
in thread "main" java.lang.IllegalThreadStateException
at java.lang.Thread.start(Unknown Source)
at com.threads.status.ThreadExample.main(ThreadExample.java:30)
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