java - 类型安全: Unchecked cast from Integer to T

Question

如何修复从 Integer 到 T 的未经检查的强制转换？我在这一行收到此警告:

undoStackIndexes.push((T)index);

代码:

SimpleStack<T> undoStackIndexes = new SimpleStack<T>();
SimpleStack<T> undoStackDatas = new SimpleStack<T>();
public void add( int idx, T x ){
        Node<T> p = getNode( idx, 0, size( ) );
        Node<T> newNode = new Node<T>( x, p.prev, p );
        newNode.prev.next = newNode;
        p.prev = newNode;         
        theSize++;
        modCount++;

        undoStackDatas.push(newNode.data);
        Integer index = new Integer(idx);
        undoStackIndexes.push((T)index);
    }

Answer 1

如果您知道要在 undoStackIndexes 堆栈中存储 Integer 索引，则不应将其设为通用的 T 类型:

SimpleStack<Integer> undoStackIndexes = new SimpleStack<Integer>();