Chapter 21, Problem 6PC

Program Plan Intro

Binary Tree Input and Display

Program plan:

• Import required packages.
• Define the class named “JTreeDemo”.
  • Declare required private variables.
  • Define the constructor.
    • Initialize the values.
    • Load the “JTree”.
  • Give function definition “readData ()” to read data from the file.
    • Create the objects for “FileInputStream”, “InputStreamReader”, and “BufferedReader” in order to read the file
    • Declare variables “line”, and “countNode”.
    • Inside the “try” block,
      • Do until the file becomes empty using “while” condition.
        • Check if the line contains the given matches,
        • • Assign the values to “numNodes”.
        • Else,
        • • Assign line to “data[countNode]”.
          • Increment the value of “countNode”.
      • Close the file.
        • • • Catch the exception using “catch” block and print the exception.
  • Give function definition to populate the tree.
    • Create an object for “DefaultMutableTreeNode”.
    • Loop through the number of nodes.
      • Split the string.
      • Check if the length is greater than 1.
        • Add the node to the tree.
        • Loop through the length of node.
        • • Add the node to the tree.
      • Check if the length is equal to 1.
        • Add the node to the tree.
        • • • Load the nodes to the tree.
  • Give function definition to create GUI.
    • Create a frame and add the tree to the frame.
    • Set the close operation and call the function “pack ()”.
    • Make the frame visible.
  • Give “main ()” function.
    • Assign a filename to the variable.
    • Create an object for the class.
    • Call the function “readData ()”.
    • Call the function “populateTree ()”.
    • Call the function “createAndShowGUI()”.