无法使用 Java netbeans 加载节点 jTree

Cannot load the nodes jTree using Java netbeans

这是我第一次使用 java 使用 jtree。但是当我尝试加载它时我无法加载它显示为 blank.i 不知道如何加载 it.what 我试过到目前为止我附上了 below.please 给我解决方案谢谢。 JTree 名称是 jTree1

DefaultTreeModel root1;
     DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root"); 
        public void Load()
        {
            DefaultMutableTreeNode vegetableNode = new DefaultMutableTreeNode("Vegetables");
            vegetableNode.add(new DefaultMutableTreeNode("Capsicum"));
            vegetableNode.add(new DefaultMutableTreeNode("Carrot"));
            vegetableNode.add(new DefaultMutableTreeNode("Tomato"));
            vegetableNode.add(new DefaultMutableTreeNode("Potato"));
            DefaultMutableTreeNode fruitNode = new DefaultMutableTreeNode("Fruits");
            fruitNode.add(new DefaultMutableTreeNode("Banana"));
            fruitNode.add(new DefaultMutableTreeNode("Mango"));
            fruitNode.add(new DefaultMutableTreeNode("Apple"));
            fruitNode.add(new DefaultMutableTreeNode("Grapes"));
            fruitNode.add(new DefaultMutableTreeNode("Orange")); 
            root.add(vegetableNode);
            root.add(fruitNode); 
            root1 = (DefaultTreeModel)jTree1.getModel();
        }

您需要将树添加到根,然后将树添加到 JTree:

root1 = (DefaultTreeModel)jTree1.getModel();

收件人:

root1.setRoot(root);
jTree1.setModel(root1);

参见setModel() documentation