Compulsory TaskFollow these steps:● For this task, you are required to refactor the badly written programRPN.java. This program is a Reverse-Polish Notation calculator whichuses a stack.A Reverse-Polish Notation calculator is a calculator that will calculateequations where the operator follows the operands. Therefore, instead ofinputting an equation as “1 + 2”, a Reverse-Polish Notation calculatorwould take the following input “ 1 2 +”.A stack is a data structure in which items are added to thetop of the stack and removed from the top of the stack. It istherefore known as a last-in, first-out (LIFO) data structure.Stack terminology:○ Push — is an operation that adds an item to the topof a stack.○ Pop — is an operation that removes an item from the top of a stack.The pseudocode for this program is:○ Get an equation (e.g. 2 3 +) from the user as input.○ Loop through the string value input by the user.■ When you encounter a number (remember that numberscan include decimal points), add it to the stack (push).■ When you encounter an operator (e.g. +, -, /, etc.), pop twonumbers from the stack and perform the appropriatecalculation.○ Display the answer of the calculation to the user.● For this task you are required to:○ Troubleshoot and debug the code so that it runs correctly.○ Fix the indentation and formatting of the code so that it adheres tothe guidelines provided here.○ Make sure that all the names of variables, classes, methods, etc.adhere to the guidelines provided here.○ Refactor the code to improve the quality and readability of the codein other ways highlighted in this task.○ Most students who have to resubmit this Task do so due to errorsand styling issues. To help you discover errors and styling issuesquicker (before submitting your Task), please install the linter,SonarLint, to your IDE or editor. Use SonarLint to identify problemsand clear each one of them until there are no issues being flagged.By default, it’s configured to flag issues based on the best practiceswe’ve discussed in this review. SE L2T16 - Object-Oriented Desic X← →IG GoogleSE L2T20 - RefactoringNew TabType here to searchCV/N ✪ File C:/Users/Dell/Dropbox/DT20070002991/2-%20Introduction%20to%20Software%20Engineering/L2T20/SE%20L2T20%20-%20Refactoring.pdf QAddons Store AliExpress B. Booking.com f Facebook ►YouTubeXOSE L2T20 - Refactoring6:12 / 13Compulsory TaskX +67% + AFollow these steps:• For this task, you are required to refactor the badly written programRPN.java. This program is a Reverse-Polish Notation calculator whichuses a stack.A Reverse-Polish Notation calculator is a calculator that will calculateequations where the operator follows the operands. Therefore, instead ofinputting an equation as "1+2", a Reverse-Polish Notation calculatorwould take the following input *12+".A stack is a data structure in which items are added to thetop of the stack and removed from the top of the stack. It istherefore known as a last-in, first-out (LIFO) data structure.Stack terminology.o Push - is an operation that adds an item to the topof a stack.o Pop - is an operation that removes an item from the top of a stack.The pseudocode for this program is:o Get an equation (e.g. 23 +) from the user as input.o• For this task you are required to:Loop through the string value input by the user.■ When you encounter a number (remember that numberscan include decimal points), add it to the stack (push).■ When you encounter an operator (e.g. +, -, /, etc.), pop twonumbers from the stack and perform the appropriatecalculation.o Display the answer of the calculation to the user.o Troubleshoot and debug the code so that it runs correctly.O8814°C℗ I4)19:1111/30/2022⠀X:

Question

Compulsory TaskFollow these steps:● For this task, you are required to refactor the badly written programRPN.java. This program is a Reverse-Polish Notation calculator whichuses a stack.A Reverse-Polish Notation calculator is a calculator that will calculateequations where the operator follows the operands. Therefore, instead ofinputting an equation as “1 + 2”, a Reverse-Polish Notation calculatorwould take the following input “ 1 2 +”.A stack is a data structure in which items are added to thetop of the stack and removed from the top of the stack. It istherefore known as a last-in, first-out (LIFO) data structure.Stack terminology:○ Push — is an operation that adds an item to the topof a stack.○ Pop — is an operation that removes an item from the top of a stack.The pseudocode for this program is:○ Get an equation (e.g. 2 3 +) from the user as input.○ Loop through the string value input by the user.■ When you encounter a number (remember that numberscan include decimal points), add it to the stack (push).■ When you encounter an operator (e.g. +, -, /, etc.), pop twonumbers from the stack and perform the appropriatecalculation.○ Display the answer of the calculation to the user.● For this task you are required to:○ Troubleshoot and debug the code so that it runs correctly.○ Fix the indentation and formatting of the code so that it adheres tothe guidelines provided here.○ Make sure that all the names of variables, classes, methods, etc.adhere to the guidelines provided here.○ Refactor the code to improve the quality and readability of the codein other ways highlighted in this task.○ Most students who have to resubmit this Task do so due to errorsand styling issues. To help you discover errors and styling issuesquicker (before submitting your Task), please install the linter,SonarLint, to your IDE or editor. Use SonarLint to identify problemsand clear each one of them until there are no issues being flagged.By default, it’s configured to flag issues based on the best practiceswe’ve discussed in this review. SE L2T16 - Object-Oriented Desic X← →IG GoogleSE L2T20 - RefactoringNew TabType here to searchCV/N ✪ File C:/Users/Dell/Dropbox/DT20070002991/2-%20Introduction%20to%20Software%20Engineering/L2T20/SE%20L2T20%20-%20Refactoring.pdf QAddons Store AliExpress B. Booking.com f Facebook ►YouTubeXOSE L2T20 - Refactoring6:12 / 13Compulsory TaskX +67% + AFollow these steps:• For this task, you are required to refactor the badly written programRPN.java. This program is a Reverse-Polish Notation calculator whichuses a stack.A Reverse-Polish Notation calculator is a calculator that will calculateequations where the operator follows the operands. Therefore, instead ofinputting an equation as &#34;1+2&#34;, a Reverse-Polish Notation calculatorwould take the following input *12+&#34;.A stack is a data structure in which items are added to thetop of the stack and removed from the top of the stack. It istherefore known as a last-in, first-out (LIFO) data structure.Stack terminology.o Push - is an operation that adds an item to the topof a stack.o Pop - is an operation that removes an item from the top of a stack.The pseudocode for this program is:o Get an equation (e.g. 23 +) from the user as input.o• For this task you are required to:Loop through the string value input by the user.■ When you encounter a number (remember that numberscan include decimal points), add it to the stack (push).■ When you encounter an operator (e.g. +, -, /, etc.), pop twonumbers from the stack and perform the appropriatecalculation.o Display the answer of the calculation to the user.o Troubleshoot and debug the code so that it runs correctly.O8814°C℗ I4)19:1111/30/2022⠀X:

Accepted Answer

Define a StackNode class:StackNode represents a node in a stack used for evaluating RPN…