如何通过名称而不是值获取 TreeView 分支?

How can I get a TreeView branch by name rather than value?

有什么方法可以通过名称获得 TreeView 分支? 例如,如果我有一个像这样的 TreeView 菜单:

TreeItem<String> root, branch;

root = new TreeItem<>();
root.setExpanded(true);

branch = makeBranch("Chicken", root);

makeBranch("Hen", branch);

这里是 makeBranch() 方法:

public TreeItem<String> makeBranch(String s, TreeItem<String> parent){

    TreeItem<String> item = new TreeItem<>(s);
    item.setExpanded(true);

    parent.getChildren().add(item);
    return item;
}

现在如果我想开分店,我可以这样做:

branch.getChildren().get(a_number); // get using index

但是无论如何我可以通过名称而不是值来获得分支吗? 所以像:

branch.getChildren().get("the name of leaf or branch");

TreeItem.getChildren() returns a ObservableList<TreeItem<T>>, you can use the methods of List to find the child you're looking for, e.g. using Stream过滤内容:

final String value = "the name of leaf or branch";
Optional<TreeItem<String>> nodeOptional = branch.getChildren().stream()
                                                .filter(
                                                    (child)-> child.getValue().equals(value)
                                                 )
                                                .findFirst();

if (nodeOptional.isPresent()) {
    TreeItem<String> item = nodeOptional.get();
    // do something with item
} else {
    // no child with specified value was found
}

请注意,您只能以这种方式搜索 branch 直接 子级。如果你想找到 branch 的任意后代,你必须做 tree search.