Modify the Loan class in Listing 10.2 to throw IllegalArgumentException if the loan amount, interest rate, or number of years is less than or equal to zero.

Listing

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1 public class Loan { 2 private double annualInterestRate; private int number0fYears; 3 private double loanAmount; private java.util.Date loanDate; /** Default constructor */ public Loan() { this(2.5, 1, 1000); 10 11 12 /** Construct a loan with specified annual interest rate, 13 number of years, and loan amount 14 public Loan(double annualInterestRate, int number0fYears, double loanAmount) { this.annualInterestRate = annualInterestRate; this.number0fYears = number0fYears; this.loanAmount = loanAmount; loanDate - new java.util.Date(); 15 16 17 18 19 20 21 22 23 /** Return annualInterestRate */ public double getAnnualInterestRate() { return annualInterestRate; 24 25 26 27 28 /** Set a new annualInterestRate */ public void setAnnualInterestRate(double annualInterestRate) { this. annualInterestRate - annualInterestRate; 29 30 31 32 33 /** Return number0fYears */ public int getNumber0fYears () { return number0fYears; 34 35 36 37 38 /** Set a new numberofYears */ public void setNumberofYears(int numberofYears) { this.number0fYears = numberofYears; 39 40 41 42 43 /** Return loanAmount */ public double getloanAmount () { return loanAmount; 44 45 46 47 48 49 /** Set a new 1loanAmount */ public void setLoanAmount (double loanAmount) { this.loanAmount = loanAmount; 50 51 52 /** Find monthly payment */ public double getMonthlyPayment() { double monthlyInterestRate = annualInterestRate / 1200; double monthlyPayment = loanAmount * monthlyInterestRate / (1 - (1 / Math.pow(1 + monthlyInterestRate, number0fYears * 12))); return monthlyPayment; 53 54 55 56 57 58 59 60 61 /** Find total payment */ public double get TotalPayment () { double totalPayment - getMonthlyPayment () * numberofYears * 12; return totalPayment; 62 63 64 65 66 67 /** Return loan date */ 68 69 public java.util. Date getloanDate() { return loanDate; 70 71 }