Write the following code in Java. Below is a program written to calculate an invoice total. Analyze and modify the program to design an object-oriented solution by using the three layers architecture, and provide source code to include the following: It is important to do what is in bold. For each layer, they must be a separate class. So in total of 3 classes.

• A business rule layer with methods to manipulate data (i.e., Constructor(s), mutators, accessor, customized methods, and others)

• A Database layer for data processing

• An user interface layer to test your application

• Exception handling statements that handles exceptions when they occur.

• Overloaded methods

• StringBuilder to print results

• Test runs

Provide an object-oriented design solution for the Java application:

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To design an objectoriented solution using the threelayer architecture in Java for calculating an invoice total lets break it down into the three laye... View the full answer