parenttreenode.java

源程序（包括最初的版本

package tree;

/**
 *
 */
class ParentTreeNode {
    Object element;
    int parent;//双亲位置域
    public ParentTreeNode() {
    }
    public ParentTreeNode(Object e,int p) {
        element=e; parent=p;
    }

    public String toString() {
        return element.toString();
    }
}