A simple test to see how we can build a tree and populate it : Tree « Swing JFC « Java

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Java » Swing JFC » Tree

A simple test to see how we can build a tree and populate it

A simple test to see how we can build a tree and populate it


  

/*

Java Swing, 2nd Edition

By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole

ISBN: 0-596-00408-7

Publisher: O'Reilly 

*/



// TestTree.java

//A simple test to see how we can build a tree and populate it. We build

//the tree structure up by hand in this case.

//



import java.awt.BorderLayout;



import javax.swing.JFrame;

import javax.swing.JTree;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;



public class TestTree extends JFrame {



  JTree tree;



  DefaultTreeModel treeModel;



  public TestTree() {

    super("Tree Test Example");

    setSize(400, 300);

    setDefaultCloseOperation(EXIT_ON_CLOSE);

  }



  public void init() {

    // Build up a bunch of TreeNodes. We use DefaultMutableTreeNode because

    // the

    // DefaultTreeModel can use it to build a complete tree.

    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");

    DefaultMutableTreeNode subroot = new DefaultMutableTreeNode("SubRoot");

    DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("Leaf 1");

    DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Leaf 2");



    // Build our tree model starting at the root node, and then make a JTree

    // out

    // of that.

    treeModel = new DefaultTreeModel(root);

    tree = new JTree(treeModel);



    // Build the tree up from the nodes we created.

    treeModel.insertNodeInto(subroot, root, 0);

    // Or, more succinctly:

    subroot.add(leaf1);

    root.add(leaf2);



    // Display it.

    getContentPane().add(tree, BorderLayout.CENTER);

  }



  public static void main(String args[]) {

    TestTree tt = new TestTree();

    tt.init();

    tt.setVisible(true);

  }

}

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