java 同步中的线程出现异常会放弃锁吗

实验证明：会
下面代码r1会抛出异常，但是r2仍能拿到o对象的锁

public class Test {
public static void main(String[] args) throws InterruptedException {
final Object o = new Object();
Runnable r1 = new Runnable() {
public void run() {
synchronized (o) {
throw new RuntimeException("throws");
}
}
};
Runnable r2 = new Runnable() {
public void run() {
synchronized(o) {
System.out.println("acquire lock");
}
}
};

new Thread(r1).start();
Thread.sleep(1000);
new Thread(r2).start();

}

}