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法律研究我可以在 JTree 中用 Java 獲得指定索引的節點嗎？
要獲得 JTree 中指定索引的節點，請使用 getChildAt() 方法。此處，我們查詢索引為 3 即第 4 個節點 -
node.getChildAt(3)
以下是一個在 JTree 中獲得指定索引節點的示例 -
範例
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("Products");
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing (Product1 - P66778)");
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Accessories (Product2 - P66779)");
DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Home Decor (Product3 - P66780)");
DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Electronics (Product4 - P66781)");
node.add(node1);
node.add(node2);
node.add(node3);
node.add(node4);
DefaultMutableTreeNode one = new DefaultMutableTreeNode("Shirt");
DefaultMutableTreeNode two = new DefaultMutableTreeNode("T-shirt");
DefaultMutableTreeNode three = new DefaultMutableTreeNode("Hoodie");
DefaultMutableTreeNode four = new DefaultMutableTreeNode("Sunglasses");
DefaultMutableTreeNode five = new DefaultMutableTreeNode("Frames");
DefaultMutableTreeNode six = new DefaultMutableTreeNode("Belts");
DefaultMutableTreeNode seven = new DefaultMutableTreeNode("Showpieces & Figurines");
DefaultMutableTreeNode eight = new DefaultMutableTreeNode("Clocks");
DefaultMutableTreeNode nine = new DefaultMutableTreeNode("Wall Shelves");
DefaultMutableTreeNode ten = new DefaultMutableTreeNode("Mobile Accessories");
DefaultMutableTreeNode eleven = new DefaultMutableTreeNode("Smart Wearable Tech");
DefaultMutableTreeNode twelve = new DefaultMutableTreeNode("Health Care Applicances");
DefaultMutableTreeNode thirteen = new DefaultMutableTreeNode("Smart Home Automation");
node1.add(one);
node1.add(two);
node1.add(three);
node2.add(four);
node2.add(five);
node2.add(six);
node3.add(seven);
node3.add(eight);
node3.add(nine);
node4.add(ten);
node4.add(eleven);
node4.add(twelve);
node4.add(thirteen);
JTree tree = new JTree(node);
for (int i = 0; i < tree.getRowCount(); i++) {
tree.expandRow(i);
}
tree.putClientProperty("JTree.lineStyle", "Angled");
System.out.println("Node 4 = "+node.getChildAt(3));
tree.setRowHeight(25);
frame.add(tree);
frame.setSize(600,450);
frame.setVisible(true);
}
}輸出如下，顯示控制檯上的指定索引處的子代 -
輸出
以下是我們 JTree -
更新於： 30-07-2019
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