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Paint Binary Search Tree to Scroll Pane in GUI

 
Kyle Woolsey
Greenhorn
Posts: 2
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Hi, I am making a GUI which will allow a user to enter in values and have them displayed visually in a binary search tree. I think the code I am using to create the binary search tree should work, but am having trouble calling the class with the paint instructions to my GUI(scroll pane) as it immediately requires a value, before I can enter one, and throws a null pointer exception.

How can I call the class which creates the Binary Search Tree without throwing this exception

GUI Class





Tree Panel Class which creates Binary Search Tree





Thanks Kyle
 
It is sorta covered in the JavaRanch Style Guide.
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