Build a tree and populate it from hashtables

    
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// ObjectTree.java
//A simple test to see how we can build a tree and populate it. This version
//builds the tree from hashtables.
//

import java.awt.BorderLayout;
import java.util.Hashtable;

import javax.swing.JFrame;
import javax.swing.JTree;

public class ObjectTree extends JFrame {

  JTree tree;

  String[][] sampleData = { { "Amy" }, { "Brandon", "Bailey" }, { "Jodi" },
      { "Trent", "Garrett", "Paige", "Dylan" }, { "Donn" },
      { "Nancy", "Donald", "Phyllis", "John", "Pat" }, { "Ron" },
      { "Linda", "Mark", "Lois", "Marvin" } };

  public ObjectTree() {
    super("Hashtable Test");
    setSize(400, 300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
  }

  public void init() {
    Hashtable h = new Hashtable();
    // Build up the hashtable using every other entry in the String[][] as a
    // key
    // followed by a String[]"value."
    for (int i = 0; i < sampleData.length; i += 2) {
      h.put(sampleData[i][0], sampleData[i + 1]);
    }
    tree = new JTree(h);
    getContentPane().add(tree, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    ObjectTree tt = new ObjectTree();
    tt.init();
    tt.setVisible(true);
  }
}

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Build a tree and populate it from hashtables : Tree « Swing JFC « Java

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