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法律教程使用 Java 获取 JTree 中节点上方的级别数
要获取节点上方的级别数，请使用 getLevel() 方法。以下是根节点“node”的示例 -
node.getLevel()
注意 - 如果节点是根节点，则返回 0，因为根节点上方没有级别。
对于其他节点，请获取节点上方的级别数，如下所示，其中 node3 -
node3.getLevel()
以下是在 JTree 中获取节点上方的级别数的示例 -
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("Domain");
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Topics");
DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("QA");
DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Tools");
node.add(node1);
node.add(node2);
node.add(node3);
node.add(node4);
DefaultMutableTreeNode one = new DefaultMutableTreeNode("Management ");
DefaultMutableTreeNode two = new DefaultMutableTreeNode("Finance");
DefaultMutableTreeNode three = new DefaultMutableTreeNode("Networking");
DefaultMutableTreeNode four = new DefaultMutableTreeNode("MIS");
DefaultMutableTreeNode five = new DefaultMutableTreeNode("DBMS");
DefaultMutableTreeNode six = new DefaultMutableTreeNode("CSS");
DefaultMutableTreeNode seven = new DefaultMutableTreeNode("MongoDB");
DefaultMutableTreeNode eight = new DefaultMutableTreeNode("Python QA");
DefaultMutableTreeNode nine = new DefaultMutableTreeNode("jQuery QA");
DefaultMutableTreeNode ten = new DefaultMutableTreeNode("Code Formatter Tool");
node1.add(one);
node1.add(two);
node1.add(three);
node2.add(four);
node2.add(five);
node2.add(six);
node2.add(seven);
node3.add(eight);
node3.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");
System.out.println("Number of children of root node = " + node.getChildCount());
System.out.println("Depth of Tree = " + node.getDepth());
System.out.println("Count of Tree Leaves(root node) = " + node.getLeafCount());
System.out.println("Count of Tree Leaves(node1) = " + node1.getLeafCount());
System.out.println("Number of levels above root node = " + node.getLevel());
System.out.println("Number of levels above node1 = " + node1.getLevel());
System.out.println("Number of levels above node2 = " + node2.getLevel());
System.out.println("Number of levels above node3 = " + node3.getLevel());
System.out.println("Number of levels above node4 = " + node4.getLevel());
tree.setRowHeight(20);
frame.add(tree);
frame.setSize(600,450);
frame.setVisible(true);
}
}以下是 JTree -
输出
更新于：2019 年 7 月 30 日
276 次查看
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