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Chapter 25.4, Problem 25.4.1CP
Program Plan Intro

“displayTree” method:

  • The “displayTree” method will display the left subtree and right subtree recursively.
  • In the pane the line is added to connect the two nodes. The “displayTree” method first adds the line to the pane then it will add the circle into the pane. So the circle will be painted on top of the lines.

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