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jsshin8128
multithreading
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Step7_DaemonThread.java
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main
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Step7_DaemonThread.java
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public class Step7_DaemonThread {
public static void main(String[] args) {
// 데몬 스레드는 일반 스레드(사용자 스레드)의 작업을 보조하는 스레드입니다.
// JVM은 모든 사용자 스레드가 종료되면 데몬 스레드가 남아 있더라도 기다리지 않고 종료합니다.
Thread daemon = new Thread(() -> {
while (true) {
System.out.println("[daemon] 백그라운드에서 계속 실행 중입니다.");
sleep(200);
}
}, "daemon-thread");
daemon.setDaemon(true); // 데몬 스레드로 설정합니다. `start()`를 호출하기 전에 반드시 설정해야 합니다.
daemon.start();
// `main`은 사용자 스레드입니다. 잠시 작업을 수행한 뒤 종료합니다.
sleep(600);
System.out.println("[main] main 스레드가 종료됩니다.");
// `main` 사용자 스레드가 종료되면, 무한 반복 중이던 데몬 스레드도 JVM과 함께 즉시 종료됩니다.
// `setDaemon(true)`를 제거하면 해당 스레드는 사용자 스레드로 동작하게 되며,
// 무한 반복이 끝나지 않기 때문에 프로그램도 종료되지 않습니다.
}
static void sleep(long ms) {
try {
Thread.sleep(ms);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
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