TreeSelectionModel: addTreeSelectionListener(TreeSelectionListener x) : TreeSelectionModel « javax.swing.tree « Java by API

1. Java by API
2. javax.swing.tree
3. TreeSelectionModel

TreeSelectionModel: addTreeSelectionListener(TreeSelectionListener x)

  

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeSelectionModel;

public class Main extends JFrame {
  public Main() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("abcde");
    DefaultMutableTreeNode node = new DefaultMutableTreeNode("1");
    node.add(new DefaultMutableTreeNode("12345"));
    node.add(new DefaultMutableTreeNode("testing"));
    root.add(node);
    root.add(new DefaultMutableTreeNode("1234567890"));

    TreeModel tm = new DefaultTreeModel(root);
    JTree tree = new JTree(tm);
    tree.getSelectionModel().addTreeSelectionListener(new Selector());
    tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
    getContentPane().add(tree, BorderLayout.CENTER);
    pack();
    setVisible(true);
  }

  private class Selector implements TreeSelectionListener {
    public void valueChanged(TreeSelectionEvent event) {
      Object obj = event.getNewLeadSelectionPath().getLastPathComponent();
      System.out.println("" + obj.toString().length());
    }
  }

  public static void main(String[] args) {
    Main m = new Main();
  }
}

   
    
  

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