javafx – 为TreeView设置两个根节点

要获得所需的效果,请创建一个虚拟根节点并将其两个节点添加到该节点.使用虚拟根节点创建TreeView并调用tree.setShowRoot(false),因此虚拟节点不会出现.

final TreeItem<String> root1 = new TreeItem<>("root 1");
final TreeItem<String> root2 = new TreeItem<>("root 2");
final TreeView<String> tree = createTreeView(root1,root2);

// ...

private TreeView<String> createTreeView(TreeItem<String> root1,TreeItem<String> root2) {
    TreeItem<String> dummyRoot = new TreeItem<>();
    dummyRoot.getChildren().addAll(root1,root2);
    TreeView<String> tree = new TreeView<>(dummyRoot);
    tree.setShowRoot(false);
    return tree ;
}