java - 如何在JTree中只显示根？

Question

我有一个像这样的JTree:

private TreeNode createNodes() {

        DefaultMutableTreeNode root;
        DefaultMutableTreeNode grandparent;
        DefaultMutableTreeNode parent;

        root = new DefaultMutableTreeNode("San Francisco");

        grandparent = new DefaultMutableTreeNode("Potrero Hill");
        root.add(grandparent);

        parent = new DefaultMutableTreeNode("Restaurants");
        grandparent.add(parent);

        dummyParent = root;

        return root;
    }

我只想在屏幕上显示根“San Francisco”，而不是默认显示。然后，只有当我单击扩展图标时，树才会展开。我怎样才能做到这一点？我尝试过使用一些方法:

         tree.setRootVisible(true);
         tree.setShowsRootHandles(false);

Answer 1

I want to show only the root "San Francisco" in the screen

创建数据并将模型添加到树后，您可以使用:

tree.collapseRow(0);