import java.util.concurrent.atomic.AtomicInteger;
public class AtomicVariableExample {
private static AtomicInteger counter = new AtomicInteger(0);
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
new Thread(() -> {
for (int j = 0; j < 1000; j++) {
counter.incrementAndGet();
}
}).start();
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Counter: " + counter.get());
}
}
import java.util.concurrent.ConcurrentHashMap;
public class ConcurrentCollectionExample {
private static ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>();
public static void main(String[] args) {
map.put("A", 1);
map.put("B", 2);
map.put("C", 3);
new Thread(() -> {
map.put("D", 4);
}).start();
new Thread(() -> {
System.out.println(map.get("A"));
}).start();
}
}
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ThreadPoolExample {
public static void main(String[] args) {
ExecutorService executorService = Executors.newFixedThreadPool(5);
for (int i = 0; i < 10; i++) {
executorService.submit(() -> {
System.out.println("Thread: " + Thread.currentThread().getName());
});
}
executorService.shutdown();
}
}
