java 写法咨询

Question

    public boolean offer(E o) {
        if (o == null) throw new NullPointerException();
        final ReentrantLock lock = this.lock;
        lock.lock();
        try {
            if (count == items.length)
                return false;
            else {
                insert(o);
                return true;
            }
        } finally {
            lock.unlock();
        }
    }---》
final ReentrantLock lock = this.lock;
赋值给局部变量，有啥好处Java

Answer 1

final修饰的变量将成为常量，就是不可改变了！