清单4展示了具有列的基本树的完整实现，其中，列排序功能添加在第27和33行。
Listing 4 shows the full implementation of the Basic tree with columns, in which the column-sorting capability is added in lines 27 and 33.
swt树的一个较困难的方面是实现树项目的排序，对于这个主题，公共支持论坛中提供的信息难以满足广大用户的需求。
One difficult aspect of SWT trees is to implement sorting of the tree's items, a topic on which information is much sought after in public support forums.
它通过判断树支的边缘性质，逐个确定树支的排序，从而实现线形树。
The pendant property of tree branches is checked and the order of tree branches is determined step by step, then the linear tree is realized.
终结符号处理过程中，深入地研究了字符串匹配算法和正则表达式匹配算法，并实现了二叉排序树字符串匹配算法。
First, classic string matching algorithms and regular expression matching algorithms are studied; second a binary sort tree string matching algorithm is proposed and realized.
终结符号处理过程中，深入地研究了字符串匹配算法和正则表达式匹配算法，并实现了二叉排序树字符串匹配算法。
First, classic string matching algorithms and regular expression matching algorithms are studied; second a binary sort tree string matching algorithm is proposed and realized.
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