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Did you read the tutorial at the link I posted about how to pass args to a method?

The method: getCalculationType() should do only what its name says: get a type and return it to the caller. I...

Do the other methods get the user's input passed to them as arguments?
See the tutorial on how to pass args: Passing Information to a Method or a Constructor (The Java™ Tutorials > Learning the Java...

Ok.

switch statements can be used for choosing what method to call based on the value in variable.

Copy the definition for the variable: input from the main() method to the method. This is where input is defined:

Scanner input = new Scanner(System.in);


I'm done for tonight.

When you get compiler errors, please copy the full text of the error messages and paste it here.

The compiler can't find a definition for the variable: input. One solution is to copy its...

The method should use statement just like I posted except with the names of variables that are in the method.
Don't use the names from the main() method.

The following statements from your posted code does that:


System.out.print("Enter Loan Amount: "); // ask the user to enter data
double principle = input.nextInt(); // read the...