public <T> List<T> convert(Class<T> tClass, Consumer<T> consumer) { if (CollectionUtils.isEmpty(this.getList())) { return new ArrayList(); } else { List<T> res = new ArrayList(this.list.size()); List list = this.getList(); try { Iterator var5 = list.iterator(); while(var5.hasNext()) { Map<String, Object> map = (Map)var5.next(); T t = tClass.newInstance(); BeanUtils.populate(t, map); consumer.accept(t); res.add(t); } return res; } catch (Exception var8) { log.error("反射创建对象失败", var8); throw new AppException("服务器异常，创建对象失败"); } } }

这是一个Java方法，它的作用是将一个List<Map>转换成List<T>，其中T是一个Java类的泛型，由参数tClass指定。方法基本上是通过对每个Map中的键值对进行映射从而创建一个T类型的对象，并将其加入到结果列表中。在对象创建的过程中，使用了BeanUtils类的populate方法将Map中的键值对赋值给T类型对象的属性。同时，还提供了一个Consumer函数接口类型用于外部进一步处理T类型的对象。需要注意的是，在创建T类型对象的过程中，如果出现异常，将会抛出自定义的AppException异常。

相关问题

public interface DequeInterface<T>

{ /** Adds a new entry to the front/back of this deque.
@param newEntry An object to be added. */
public void addToFront(T newEntry);
public void addToBack(T newEntry);

/** Removes and returns the front/back entry of this deque.
@return The object at the front/back of the deque.
@throws EmptyQueueException if the deque is empty before the operation. */
public T removeFront();
public T removeBack();

/** Retrieves the front/back entry of this deque.
@return The object at the front/back of the deque.
@throws EmptyQueueException if the deque is empty before the operation. */
public T getFront();
public T getBack();

/** Detects whether this deque is empty.
@return True if the deque is empty, or false otherwise. */
public boolean isEmpty();

/** Removes all entries from this deque. */
public void clear();
} // end DequeInterface

C++设计一个循环队列QUEUE<T>

以下是以C++语言实现的循环队列QUEUE<T>的示例代码：

template <typename T>
class Queue {
private:
    T *data;
    int front, rear, size;

public:
    Queue(int init_size = 10): data(new T[init_size]), front(0), rear(0), size(init_size) {};

    bool isEmpty() const {
        return front == rear;
    }

    bool isFull() const {
        return (rear + 1) % size == front;
    }

    int getSize() const {
        return (rear - front + size) % size;
    }

    void enqueue(const T& obj) {
        if (isFull()) {
            T *newData = new T[2 * size];
            int j = 0;
            for (int i = front; i != rear; i = (i + 1) % size) {
                newData[j++] = data[i];
            }
            newData[j++] = data[rear];
 
            front = 0;
            rear = j - 1;
            size *= 2;
            delete [] data;
            data = newData;
        }

        data[rear] = obj;
        rear = (rear + 1) % size;
    }

    T dequeue() {
        if (isEmpty()) {
            throw std::underflow_error("Queue empty");
        }

        T obj = data[front];
        front = (front + 1) % size;
        return obj;
    }
};

该循环队列QUEUE<T>支持动态扩容，当队列满时会将队列大小扩充为原大小的两倍，同时将队列中的元素复制到新的内存中，并删除原有内存。如果队列为空，则出队列操作会抛出std::underflow_error异常。