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JRuby gives me the opportunity to find which is worse, my Swing or my Ruby

View app.jruby
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require 'java'
swing_classes = %w(JFrame JButton JList JSplitPane
JTabbedPane JTextPane JScrollPane JEditorPane
DefaultListModel ListSelectionModel BoxLayout
JScrollPane JTree tree.TreeModel
text.html.HTMLEditorKit tree.DefaultMutableTreeNode tree.TreeNode)
swing_classes.each do |c|
java_import "javax.swing.#{c}"
end
 
 
def main
n = 0
frame = JFrame.new("Disk File Info")
dir = Dir.new("./testdir")
dir_node = DefaultMutableTreeNode.new(dir)
tree = JTree.new(dir_node)
scrollPane = JScrollPane.new(tree)
dir.each { |f|
node = DefaultMutableTreeNode.new(f)
dir_node.insert(node, n)
n += 1
}
cp = frame.getContentPane()
cp.add(scrollPane)
 
frame.setDefaultCloseOperation(JFrame::EXIT_ON_CLOSE)
frame.pack()
frame.set_visible(true)
end
 
main
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