I'm creating three new methods in my code; getPrincipalAmount (acquire principal amount from the user and validate it) , getInterestRate (acquire interest rate from the user and validate it), getTerm (acquire term length from the user and validate it).

Basically the part I'm confused on is in the method how to ask the user and have them input it and then validate it. I currently don't have it set up to ask the user in the method, I'm unsure on how to do that part and just confused. Any help would be greatly appreciated, thanks!

import java.util.Scanner; public class InterestCalculator5 { public static void main(String[] args ) { Scanner input = new Scanner(System.in); String strAnsYesNo; char ansYesNo = 0; //Prompt user to enter loan amount System.out.print("Enter Loan Amount: "); double principle = input.nextInt(); getPrincipalAmount(principle); //Prompt user to enter interest rate System.out.print("Enter Yearly Interest Rate (1 to 100 percent): "); double interest = input.nextDouble(); getInterestRate(interest); //Prompt user to enter term System.out.print("Enter the Term (in months): "); double term = input.nextInt(); getTerm(term); int type=0; //Prompt user to enter calculation type do{System.out.print("Enter Interest Calculation Type (1 – Simple, 2 – Monthly Compounded, 3 – Daily Compounded):"); type = input.nextInt(); switch(type) { case 1: displayInterest(principle,interest,term,"Simple",round((calculateSimpleInterest(principle, interest, term)),5),round((calculateSimpleInterest(principle, interest, term)+principle),2)); break; case 2: displayInterest(principle,interest,term,"Compound Monthly", round(calculateCompoundInterest(principle, interest,term ,12.0 ),5), round((calculateCompoundInterest(principle, interest,term ,12.0)+principle),2)); break; case 3: displayInterest(principle,interest,term,"Compound Daily", round(calculateCompoundInterest(principle, interest, term, 365.0 ),5), round((calculateCompoundInterest(principle, interest, term, 365.0)+principle),2)); break; default: System.out.println("Calculation Type Error: You must select 1, 2 or 3. You entered " +type); break; } }while (ansYesNo =='y' || ansYesNo =='Y'); System.out.println("Thank you for using Interest Calculator!"); } /** Round **/ public static double round(double numb1, double numb2) { double round = ((double) Math.round(numb1*(Math.pow(10, numb2)))/(Math.pow(10, numb2)));; return round; } /** Calculate Simple **/ public static double calculateSimpleInterest(double numb1, double numb2, double numb3) { double calculateSimpleInterest = ((numb1)*(numb2/100.0)*(numb3/12.0)); return calculateSimpleInterest; } /** Calculate Compounded Daily **/ public static double calculateCompoundInterest(double numb1, double numb2, double numb3, double numb4 ) { double calculateCompoundInterest = (numb1*Math.pow((1.0+((numb2/100.0)/numb4)),(numb4*(numb3/12.0))))-numb1; return calculateCompoundInterest; } /** display interest **/ public static void displayInterest(double numb1, double numb2, double numb3, String word1, double numb4, double numb5 ) { System.out.println("Principal Amount Interest Rate Term Calculation Type Calculated Interest Total Repayment"); System.out.println("---------------- ------------- ---- ---------------- ------------------- ---------------"); System.out.print(numb1+" "); System.out.print(+numb2+" "); System.out.print(+numb3+" "); System.out.print(word1+" "); System.out.print(+numb4+" "); System.out.println(+numb5); } /** Get principal amount **/ public static double getPrincipalAmount(double numb1) { double getPrincipalAmount = 0; do{if (numb1 > 0) getPrincipalAmount = numb1; else{ System.out.println("Data Error: Loan amount must be greater than zero. You entered " +numb1); } }while (numb1 < 0); return getPrincipalAmount; } /** Get interest rate **/ public static double getInterestRate(double numb1) { double getInterestRate = 0; do{if (numb1 >= 0 && numb1 <= 100) getInterestRate = numb1; else{ System.out.println("Data Error: Interest rate must be greater than or equal to zero and less than or equal to 100. You entered " +numb1); } }while (numb1 <= 0 && numb1 >= 100); return getInterestRate; } /** Get term **/ public static double getTerm(double numb1) { double getTerm = 0; do{if (numb1 > 0) getTerm = numb1; else{ System.out.println("Data Error: Loan amount must be greater than zero. You entered " +numb1); } }while (numb1 < 0); return getTerm; } /** Get calculation type **/ public static double getCalculationType(double numb1) { double getCalculationType = 0; do{if (numb1 <1||numb1 >3) getCalculationType = numb1; else{ System.out.println("Calculation Type Error: You must select 1, 2 or 3. You entered " +numb1);; } }while (numb1 > 1||numb1 < 3); return getCalculationType; } }