StopThread.java

package effectivejava.chapter11.item78.fixedstopthread1;
import java.util.concurrent.*;

// 코드 78-2 적절히 동기화해 스레드가 정상 종료한다. (416쪽)
public class StopThread {
    private static boolean stopRequested;

    private static synchronized void requestStop() {
        stopRequested = true;
    }

    private static synchronized boolean stopRequested() {
        return stopRequested;
    }

    public static void main(String[] args)
            throws InterruptedException {
        Thread backgroundThread = new Thread(() -> {
            int i = 0;
            while (!stopRequested())
                i++;
        });
        backgroundThread.start();

        TimeUnit.SECONDS.sleep(1);
        requestStop();
    }
}