Java Programming:
Using the dictionary class I wrote in class the other day, modify your infix expression evaluator so that it can use variables.(@CHEGG EXPERT:THIS PART IS ALREADY DONE)Create a dictionary. Add some variable names and associated values to it, then modify your evaluatorso that the text string can include the names of variables as well as constants. When you encountera variable name, look it up in the dictionary and use the value you find there. Treat undefined variables asan error.(@CHEGG EXPERT: THIS PART IS ALREADY DONE)(@CHEGG EXPERT: DO THE PART BELOW)Finally, modify your text editor from
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