Java by API/javax.swing.tree/DefaultMutableTreeNode

DefaultMutableTreeNode: add(MutableTreeNode newChild)

import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.ScrollPaneConstants;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
public class MainClass extends JPanel {
  public MainClass() {
    final JTree tree;
    final JTextField jtf;
    DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");
    DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");
    top.add(a);
    DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1");
    a.add(a1);
    DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2");
    a.add(a2);
    DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");
    top.add(b);
    DefaultMutableTreeNode b1 = new DefaultMutableTreeNode("B1");
    b.add(b1);
    DefaultMutableTreeNode b2 = new DefaultMutableTreeNode("B2");
    b.add(b2);
    DefaultMutableTreeNode b3 = new DefaultMutableTreeNode("B3");
    b.add(b3);
    tree = new JTree(top);
    JScrollPane jsp = new JScrollPane(tree);
    add(jsp, BorderLayout.CENTER);
    jtf = new JTextField("", 20);
    add(jtf, BorderLayout.SOUTH);
    tree.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        TreePath tp = tree.getPathForLocation(me.getX(), me.getY());
        if (tp != null)
          jtf.setText(tp.toString());
        else
          jtf.setText("");
      }
    });
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

DefaultMutableTreeNode: breadthFirstEnumeration()

import java.awt.BorderLayout;
import java.util.Enumeration;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Traverse Tree");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JTree tree = new JTree();
    tree.setRootVisible(true);
    TreeModel model = tree.getModel();
    Object rootObject = model.getRoot();
    if ((rootObject != null) && (rootObject instanceof DefaultMutableTreeNode)) {
      DefaultMutableTreeNode r = (DefaultMutableTreeNode) rootObject;
      printDescendents(r);
      Enumeration breadth = r.breadthFirstEnumeration();
      Enumeration depth = r.depthFirstEnumeration();
      Enumeration preOrder = r.preorderEnumeration();
      printEnumeration(breadth, "Breadth");
      printEnumeration(depth, "Depth");
      printEnumeration(preOrder, "Pre");
    }
    TreeSelectionListener treeSelectionListener = new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent treeSelectionEvent) {
        JTree treeSource = (JTree) treeSelectionEvent.getSource();
        TreePath path = treeSource.getSelectionPath();
        System.out.println(path);
        System.out.println(path.getPath());
        System.out.println(path.getParentPath());
        System.out.println(((DefaultMutableTreeNode) path.getLastPathComponent()).getUserObject());
        System.out.println(path.getPathCount());
      }
    };
    tree.addTreeSelectionListener(treeSelectionListener);
    JScrollPane scrollPane = new JScrollPane(tree);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 400);
    frame.setVisible(true);
  }
  private static void printEnumeration(Enumeration e, String label) {
    System.out.println("-----" + label + "-----");
    while (e.hasMoreElements()) {
      System.out.println(e.nextElement());
    }
  }
  public static void printDescendents(TreeNode root) {
    System.out.println(root);
    Enumeration children = root.children();
    if (children != null) {
      while (children.hasMoreElements()) {
        printDescendents((TreeNode) children.nextElement());
      }
    }
  }
}

DefaultMutableTreeNode: depthFirstEnumeration()

import java.awt.BorderLayout;
import java.util.Enumeration;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Traverse Tree");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JTree tree = new JTree();
    tree.setRootVisible(true);
    TreeModel model = tree.getModel();
    Object rootObject = model.getRoot();
    if ((rootObject != null) && (rootObject instanceof DefaultMutableTreeNode)) {
      DefaultMutableTreeNode r = (DefaultMutableTreeNode) rootObject;
      printDescendents(r);
      Enumeration breadth = r.breadthFirstEnumeration();
      Enumeration depth = r.depthFirstEnumeration();
      Enumeration preOrder = r.preorderEnumeration();
      printEnumeration(breadth, "Breadth");
      printEnumeration(depth, "Depth");
      printEnumeration(preOrder, "Pre");
    }
    TreeSelectionListener treeSelectionListener = new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent treeSelectionEvent) {
        JTree treeSource = (JTree) treeSelectionEvent.getSource();
        TreePath path = treeSource.getSelectionPath();
        System.out.println(path);
        System.out.println(path.getPath());
        System.out.println(path.getParentPath());
        System.out.println(((DefaultMutableTreeNode) path.getLastPathComponent()).getUserObject());
        System.out.println(path.getPathCount());
      }
    };
    tree.addTreeSelectionListener(treeSelectionListener);
    JScrollPane scrollPane = new JScrollPane(tree);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 400);
    frame.setVisible(true);
  }
  private static void printEnumeration(Enumeration e, String label) {
    System.out.println("-----" + label + "-----");
    while (e.hasMoreElements()) {
      System.out.println(e.nextElement());
    }
  }
  public static void printDescendents(TreeNode root) {
    System.out.println(root);
    Enumeration children = root.children();
    if (children != null) {
      while (children.hasMoreElements()) {
        printDescendents((TreeNode) children.nextElement());
      }
    }
  }
}

DefaultMutableTreeNode: getUserObject()

import java.awt.BorderLayout;
import java.awt.ruponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellRenderer;
public class MainClass {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("Tree Tips");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JTree tree = new JTree(new String[]{"a","b","c"});
    ToolTipManager.sharedInstance().registerComponent(tree);
    TreeCellRenderer renderer = new ToolTipTreeCellRenderer();
    tree.setCellRenderer(renderer);
    JScrollPane scrollPane = new JScrollPane(tree);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}
class ToolTipTreeCellRenderer implements TreeCellRenderer {
  DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
  public ToolTipTreeCellRenderer() {
  }
  public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected,
      boolean expanded, boolean leaf, int row, boolean hasFocus) {
    Object tip = null;
    if (value != null) {
      
      if (value instanceof DefaultMutableTreeNode) {
        tip = ((DefaultMutableTreeNode) value).getUserObject();
      } else {
        tip = tree.convertValueToText(value, selected, expanded, leaf, row, hasFocus);
      }
      renderer.setToolTipText((String)tip);
    }
    renderer.setText((String)tip);
    return renderer;
  }
}

DefaultMutableTreeNode: preorderEnumeration()

import java.awt.BorderLayout;
import java.util.Enumeration;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Traverse Tree");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JTree tree = new JTree();
    tree.setRootVisible(true);
    TreeModel model = tree.getModel();
    Object rootObject = model.getRoot();
    if ((rootObject != null) && (rootObject instanceof DefaultMutableTreeNode)) {
      DefaultMutableTreeNode r = (DefaultMutableTreeNode) rootObject;
      printDescendents(r);
      Enumeration breadth = r.breadthFirstEnumeration();
      Enumeration depth = r.depthFirstEnumeration();
      Enumeration preOrder = r.preorderEnumeration();
      printEnumeration(breadth, "Breadth");
      printEnumeration(depth, "Depth");
      printEnumeration(preOrder, "Pre");
    }
    TreeSelectionListener treeSelectionListener = new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent treeSelectionEvent) {
        JTree treeSource = (JTree) treeSelectionEvent.getSource();
        TreePath path = treeSource.getSelectionPath();
        System.out.println(path);
        System.out.println(path.getPath());
        System.out.println(path.getParentPath());
        System.out.println(((DefaultMutableTreeNode) path.getLastPathComponent()).getUserObject());
        System.out.println(path.getPathCount());
      }
    };
    tree.addTreeSelectionListener(treeSelectionListener);
    JScrollPane scrollPane = new JScrollPane(tree);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 400);
    frame.setVisible(true);
  }
  private static void printEnumeration(Enumeration e, String label) {
    System.out.println("-----" + label + "-----");
    while (e.hasMoreElements()) {
      System.out.println(e.nextElement());
    }
  }
  public static void printDescendents(TreeNode root) {
    System.out.println(root);
    Enumeration children = root.children();
    if (children != null) {
      while (children.hasMoreElements()) {
        printDescendents((TreeNode) children.nextElement());
      }
    }
  }
}

DefaultMutableTreeNode: setToolTipText(String text)

import java.awt.BorderLayout;
import java.awt.ruponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellRenderer;
public class MainClass {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("Tree Tips");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JTree tree = new JTree(new String[]{"a","b","c"});
    ToolTipManager.sharedInstance().registerComponent(tree);
    TreeCellRenderer renderer = new ToolTipTreeCellRenderer();
    tree.setCellRenderer(renderer);
    JScrollPane scrollPane = new JScrollPane(tree);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}
class ToolTipTreeCellRenderer implements TreeCellRenderer {
  DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
  public ToolTipTreeCellRenderer() {
  }
  public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected,
      boolean expanded, boolean leaf, int row, boolean hasFocus) {
    Object tip = null;
    if (value != null) {
      
      if (value instanceof DefaultMutableTreeNode) {
        tip = ((DefaultMutableTreeNode) value).getUserObject();
      } else {
        tip = tree.convertValueToText(value, selected, expanded, leaf, row, hasFocus);
      }
      renderer.setToolTipText((String)tip);
    }
    renderer.setText((String)tip);
    return renderer;
  }
}

new DefaultMutableTreeNode(String text)

import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.ScrollPaneConstants;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
public class MainClass extends JPanel {
  public MainClass() {
    final JTree tree;
    final JTextField jtf;
    DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");
    DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");
    top.add(a);
    DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1");
    a.add(a1);
    DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2");
    a.add(a2);
    DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");
    top.add(b);
    DefaultMutableTreeNode b1 = new DefaultMutableTreeNode("B1");
    b.add(b1);
    DefaultMutableTreeNode b2 = new DefaultMutableTreeNode("B2");
    b.add(b2);
    DefaultMutableTreeNode b3 = new DefaultMutableTreeNode("B3");
    b.add(b3);
    tree = new JTree(top);
    JScrollPane jsp = new JScrollPane(tree);
    add(jsp, BorderLayout.CENTER);
    jtf = new JTextField("", 20);
    add(jtf, BorderLayout.SOUTH);
    tree.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        TreePath tp = tree.getPathForLocation(me.getX(), me.getY());
        if (tp != null)
          jtf.setText(tp.toString());
        else
          jtf.setText("");
      }
    });
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}