如何使用 Java 在 JTree 组件中找到节点?
要查找 JTree 组件中的节点,请使用 getNextMatch() 方法。此处,我们尝试查找以 “A” 字符开头的节点。从使用 begnRow 变量设置的以下节点开始搜索 −
int begnRow = 0; String prefix = "A"; TreePath treePath = tree.getNextMatch(prefix, begnRow, Position.Bias.Forward);
我们已在控制台中显示结果节点 −
System.out.println("Node = "+treePath);
以下是如何使用 Java 查找 JTree 组件中的节点的示例 −
package my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.text.Position; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreePath; 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); int begnRow = 0; String prefix = "A"; TreePath treePath = tree.getNextMatch(prefix, begnRow, Position.Bias.Forward); System.out.println("Node = "+treePath); tree.setRowHeight(25); frame.add(tree); frame.setSize(550,400); frame.setVisible(true); } }
输出
输出如下。运行时,可以看到要查找的节点 −
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