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法律研究如何在 Java 中只允许在一个 JTree 中选择一个树节点？
如果希望只选择一个树节点，则将选择模式设置为 SINGLE_TREE_SELECTION −
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
以下是一个示例，允许只在一个 JTree 中选择一个树节点 −
示例
package my;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeSelectionModel;
public class SwingDemo {
public static void main(String[] args) throws Exception {
JFrame frame = new JFrame("Demo");
DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products");
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing");
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Electronics");
DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Home Decor");
DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Furniture");
node.add(node1);
node.add(node2);
node.add(node3);
node.add(node4);
DefaultMutableTreeNode one = new DefaultMutableTreeNode("Shirt");
DefaultMutableTreeNode two = new DefaultMutableTreeNode("Trousers");
DefaultMutableTreeNode three = new DefaultMutableTreeNode("Jeans");
DefaultMutableTreeNode four = new DefaultMutableTreeNode("Mobiles");
DefaultMutableTreeNode five = new DefaultMutableTreeNode("Camera");
DefaultMutableTreeNode six = new DefaultMutableTreeNode("Tablet");
DefaultMutableTreeNode seven = new DefaultMutableTreeNode("Paintings");
DefaultMutableTreeNode eight = new DefaultMutableTreeNode("Showpieces");
DefaultMutableTreeNode nine = new DefaultMutableTreeNode("Wardrobes");
DefaultMutableTreeNode ten = new DefaultMutableTreeNode("Bean Bags");
node1.add(one);
node1.add(two);
node1.add(three);
node2.add(four);
node2.add(five);
node2.add(six);
node3.add(seven);
node3.add(eight);
node4.add(nine);
node4.add(ten);
JTree tree = new JTree(node);
for (int i = 0; i < tree.getRowCount(); i++) {
tree.expandRow(i);
}
tree.putClientProperty("JTree.lineStyle", "Angled");
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setRowHeight(25);
frame.add(tree);
frame.setSize(600,450);
frame.setVisible(true);
}
}这将产生以下输出。您只能选择一个节点。使用 CTRL 键选择多个节点不起作用 −
输出
更新日期： 30-Jul-2019
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