如何在 Java 中显示树形结构的数据?
要显示树形结构的数据,请在 Java Swing 中使用 JTree 控件。
首先,在树中创建一个节点 -
DefaultMutableTreeNode node = new DefaultMutableTreeNode("Project");
现在,向上面创建的节点添加节点 -
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("App"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Website"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("WebApp"); node.add(node1); node.add(node2); node.add(node3);
现在,创建更多节点并将其设置为我们上面创建的节点的子节点 -
DefaultMutableTreeNode one = new DefaultMutableTreeNode("Learning website"); DefaultMutableTreeNode two = new DefaultMutableTreeNode("Business website"); DefaultMutableTreeNode three = new DefaultMutableTreeNode("News publishing website"); DefaultMutableTreeNode four = new DefaultMutableTreeNode("Android app"); DefaultMutableTreeNode five = new DefaultMutableTreeNode("iOS app"); DefaultMutableTreeNode six = new DefaultMutableTreeNode("Editor WebApp"); node1.add(one); node1.add(two); node1.add(three); node2.add(four); node2.add(five); node3.add(six);
现在,创建一个 JTree 并在此 JTree 中设置根节点 -
JTree tree = new JTree(node);
以下是使用 Java Swing JTree 显示树形结构数据的示例 -
示例
package my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Project"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("App"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Website"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("WebApp"); node.add(node1); node.add(node2); node.add(node3); DefaultMutableTreeNode one = new DefaultMutableTreeNode("Learning website"); DefaultMutableTreeNode two = new DefaultMutableTreeNode("Business website"); DefaultMutableTreeNode three = new DefaultMutableTreeNode("News publishing website"); DefaultMutableTreeNode four = new DefaultMutableTreeNode("Android app"); DefaultMutableTreeNode five = new DefaultMutableTreeNode("iOS app"); DefaultMutableTreeNode six = new DefaultMutableTreeNode("Editor WebApp"); node1.add(one); node1.add(two); node1.add(three); node2.add(four); node2.add(five); node3.add(six); JTree tree = new JTree(node); frame.add(tree); frame.setSize(550,400); frame.setVisible(true); } }
输出
广告