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Project 1 The first programming project involves writing a program that converts prefix expressions to postfix and postfix expressions to prefix. Customary infix expression place the operator between the two operands. In a prefix expression, the operator comes before the two operands. In a postfix expression it comes after them. One benefit of prefix and postfix expressions is that they never require parentheses nor rules regarding precedence or associativity. The program for this project should consist of three classes. The main class should create a GUI that allows the user to input an expression in either prefix or postfix and convert it to postfix or prefix, respectively. The GUI should look as follows: Expresson Converter - C X Enter Expression *2+2-+1292 Prefix to Postlix Postlix to Prelix Result The GUI must be generated by code that you write. You may not use a drag-and-drop GUI generator. The second class should contain the code to perform the conversions. The pseudocode for prefix to postfix, which requires two stacks, is shown below: tokenize the string containing the prefix expression while there are more tokens push the token onto a reversal stack if it is not a space while the reversal stack is not empty pop the next token from the reversal stack if it is an operand push it onto the operand stack else it is an operator pop two operands off of the operand stack create a string with the two operands followed the operator push that string onto the operand stack pop the postfix expression off the stack The pseudocode for the postfix to prefix conversion, which requires only one stack, is shown below: tokenize the string containing the postfix expression while there are more tokens get the next token if it is a space skip it else if it is an operand push it onto the operand stack else it is an operator pop two operands off of the operand stack create a string with the operator followed by two operands push that string onto the operand stack pop the prefix expression off the stack Be sure to add any additional methods needed to eliminate any duplication of code. The input expressions should not be required to contain spaces between tokens unless they are consecutive operands. The output expressions should always have a space between all symbols. A checked exception SyntaxError should be thrown by the methods that perform the conversions if an empty stack is ever popped or the stack is not empty once the conversion is complete. That exception should be caught in the main class, where a joptionPane window should be displayed containing an error message. You are to submit two files. 1. The first is a zip file that contains all the source code for the project. The zip file should contain only source code and nothing else, which means only the java files. If you elect to use a package the java files should be in a folder whose name is the package name. Every outer class should be in a separate ava file with the same name as the class name. Each file should include a comment block at the top containing your name, the project name, the date, and a short description of the class contained in that file. 2. The second is a Word document (PDF or RTF is also acceptable) that contains the documentation for the project, which should include the following: a. A UML class diagram that includes all classes you wrote. Do not include predefined classes. You need only include the class name for each individual class, not the variables or methods b. A test plan that includes test cases that you have created indicating what aspects of the program each one is testing c. A short paragraph on lessons learned from the project

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import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

* This class is responsible
* for creating the UI. It extends from JFrame
* then adds JPanels to the main UI to add other
* graphical components. It uses an instance of
* expression converter to call the prefix and
* postfix methods when user makes a call
* accordingly.
public class ExpressionConverterGUI extends JFrame {

    private ExpressionConverter converter;

    * The default constructor
    * of the class.
    public ExpressionConverterGUI() {

       converter = new ExpressionConverter();

       setSize(400, 150);
       setTitle("Expression Converter");

    * This method initializes
    * the UI components and adds to
    * the frame.
    private void init() {
       setLayout(new GridLayout(3, 1));

       JPanel inputPanel = new JPanel(new FlowLayout());
       inputPanel.add(new JLabel("Enter Expression"));
       JTextField inputText = new JTextField(20);


       JPanel buttonPanel = new JPanel(new FlowLayout());
       JButton prePostBtn = new JButton("Prefix to Postfix");
       JButton postPreBtn = new JButton("Postfix to Prefix");


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