Listening for Selection Events in a JTree Component : JTree Selection « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JTree Selection

import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreePath;

public class Main {
  public static void main(String[] argv) throws Exception {

    JTree tree = new JTree();

    tree.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent evt) {
        TreePath[] paths = evt.getPaths();

        for (int i = 0; i < paths.length; i++) {
          if (evt.isAddedPath(i)) {
            System.out.println("This node has been selected");
          } else {
            System.out.println("This node has been deselected"); 
          }
        }
      }
    });
  }
}

14.71.JTree Selection
	14.71.1.	Enabling and Disabling Multiple Selections in a JTree Component
	14.71.2.	Allow only a single node to be selected (default)
	14.71.3.	Allow selection to span one vertical contiguous set of visible nodes
	14.71.4.	Allow multiple selections of visible nodes
	14.71.5.	Listening for Selection Events in a JTree Component
	14.71.6.	Getting the Selected Nodes in a JTree Component
	14.71.7.	Returns a TreePath containing the specified node.
	14.71.8.	Determine if the third item is selected