Finally, give this TreeViewer an input node.

最后，为这个TreeViewer给定一个输入节点。

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To design a TreeViewer demo application, you must create your node class as your data model.

要设计TreeViewer演示应用程序，您必须创建节点类作为数据模型。

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First, we create one TreeViewer that can display NBA or MLB players according to your choice.

首先，创建一个可以根据选择显示NBA或MLB球员的TreeViewer。

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