-import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
public class ThreadJob implements Runnable {
public void run() {
for (int j = 0; j < 10; j++) {
- Random rand = new Random();
- int sleep_time = rand.nextInt(201);
+ int sleep_time = ThreadLocalRandom.current().nextInt(201);
try {
Thread.sleep(sleep_time);
}