The classes Loan and TestLoanClass are posted below. Modify TestLoanClass so tha

Question

The classes Loan and TestLoanClass are posted below. Modify TestLoanClass so that it throws an IllegalArgumentException with an appropriate message for each input variable.

public class Loan
{
private double annualInterestRate;
private int numberOfYears;
private double loanAmount;
private java.util.Date loanDate;

/** Default constructor */
public Loan()
{
    annualInterestRate = 2.5;
    numberOfYears = 1;
    loanAmount = 1000;
}

/** Construct a loan with specified annual interest rate,
      number of years and loan amount
    */
public Loan(double annualInterestRate, int numberOfYears,
      double loanAmount)
{
    this.annualInterestRate = annualInterestRate;
    this.numberOfYears = numberOfYears;
    this.loanAmount = loanAmount;
    loanDate = new java.util.Date();
}

/** Return annualInterestRate */
public double getAnnualInterestRate()
{
    return annualInterestRate;
}

/** Set a new annualInterestRate */
public void setAnnualInterestRate(double annualInterestRate)
{
    this.annualInterestRate = annualInterestRate;
}

/** Return numberOfYears */
public int getNumberOfYears()
{
    return numberOfYears;
}

/** Set a new numberOfYears */
public void setNumberOfYears(int numberOfYears)
{
    this.numberOfYears = numberOfYears;
}

/** Return loanAmount */
public double getLoanAmount()
{
    return loanAmount;
}

/** Set a newloanAmount */
public void setLoanAmount(double loanAmount)
{
    this.loanAmount = loanAmount;
}

/** Find monthly payment */
public double getMonthlyPayment()
{
    double monthlyInterestRate = annualInterestRate / 1200;
    double monthlyPayment = loanAmount * monthlyInterestRate / (1 -
      (Math.pow(1 / (1 + monthlyInterestRate), numberOfYears * 12)));
    return monthlyPayment;
}

/** Find total payment */
public double getTotalPayment()
{
    double totalPayment = getMonthlyPayment() * numberOfYears * 12;
    return totalPayment;
}

/** Return loan date */
public java.util.Date getLoanDate()
{
    return loanDate;
}
}

import java.util.Scanner;

public class TestLoanClass {
/** Main method */
public static void main(String[] args) {
    // Create a Scanner
    Scanner console = new Scanner(System.in);

    // Enter yearly interest rate
    System.out.print(
      "Enter yearly interest rate, for example, 8.25: ");
    double annualInterestRate = console.nextDouble();

    // Enter number of years
    System.out.print("Enter number of years as an integer: ");
    int numberOfYears = console.nextInt();

    // Enter loan amount
    System.out.print("Enter loan amount, for example, 120000.95: ");
    double loanAmount = console.nextDouble();

    // Create Loan object
    Loan loan =
      new Loan(annualInterestRate, numberOfYears, loanAmount);

    // Display loan date, monthly payment, and total payment
    System.out.printf("The loan was created on %s " +
      "The monthly payment is %.2f The total payment is %.2f ",
      loan.getLoanDate().toString(), loan.getMonthlyPayment(),
      loan.getTotalPayment());
}
}

Explanation / Answer

import java.util.Scanner;

public class TestLoanClass {

/** Main method */

public static void main(String[] args) {

// Create a Scanner

Scanner console = new Scanner(System.in);

// Enter yearly interest rate

System.out.print(

"Enter yearly interest rate, for example, 8.25: ");

double annualInterestRate = console.nextDouble();

if (annualInterestRate < 0 || annualInterestRate > 100) {

throw new IllegalArgumentException("interest rate out of bound "+Double.toString(annualInterestRate));

}

// Enter number of years

System.out.print("Enter number of years as an integer: ");

int numberOfYears = console.nextInt();

if (numberOfYears < 0 ) {

throw new IllegalArgumentException("number of year out of bound "+Double.toString(numberOfYears));

}

// Enter loan amount

System.out.print("Enter loan amount, for example, 120000.95: ");

double loanAmount = console.nextDouble();

if (loanAmount < 0 ) {

throw new IllegalArgumentException("loan Amount out of bound "+Double.toString(loanAmount));

}

// Create Loan object

Loan loan =

new Loan(annualInterestRate,numberOfYears,loanAmount);

// Display loan date, monthly payment, and total payment

System.out.printf("The loan was created on %s " +

"The monthly payment is %.2f The total payment is %.2f ",

loan.getLoanDate().toString(), loan.getMonthlyPayment(),

loan.getTotalPayment());

}

}

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