小编Fra*_*ank的帖子

我想定义一个这样的时间界面:

public interface TimeInterface<T>
{
    static T ZERO;
    static T INFINITY;
    // some other methods...
}

这可能,或如何做到这一点,以避免错误？

提前致谢!

假设我在树中有一个节点,我怎样才能获得其祖先是这个节点的所有叶子节点？我已经像这样定义了TreeNode:

public class TreeNode<T>
{
    /** all children of the node */
    private List<TreeNode<T>> children = new ArrayList<TreeNode<T>>();
    /** the parent of the node, if the node is root, parent = null */
    private TreeNode<T> parent = null;
    /** the stored data of the node */
    private T data = null;

    /** the method I want to implement */
    public Set<TreeNode<T>> getAllLeafNodes()
    {
        Set<TreeNode<T>> leafNodes = new HashSet<TreeNode<T>>();
        return leafNodes;
    }
}