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法律研究如何在 Java 中獲取 JTree 中此節點的父節點？
比方說，我們想要一個節點的父節點，那麼使用 getParent() 方法 -
node3.getFirstChild()
您還可以獲取子節點的父節點。這裡，“nine”是子節點 -
nine.getParent()
輸出如下，在控制檯中顯示此節點的父節點 -
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("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 3 = "+node.getChildAt(2));
System.out.println("The last child of node 3 = "+node3.getLastChild());
System.out.println("Parent of node3 = "+node3.getParent());
System.out.println("Parent of child node nine = "+nine.getParent());
tree.setRowHeight(25);
frame.add(tree);
frame.setSize(600,450);
frame.setVisible(true);
}
}輸出如下，顯示此節點的父節點 -
輸出
以下是我們的 JTree -
更新於： 30-7-2019
732 次瀏覽
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