```java
public static void main(String[] args) {
ReentrantLock lock = new ReentrantLock(true);
for (int i = 0; i < 3; i++) {
int order = i;
new Thread(()->{
for (int j = 0; j < 100; j++) {
lock.lock();
System.out.println(Thread.currentThread().getName() + ":" + (char)('a'+order));
lock.unlock();
}
}, "Thread-" + i).start();
}
}
```