/**
* Write a description of class LoanTest here.
*
*/
public class Loan {
private double annualInterestRate;
private int numberOfYears;
private double loanAmount;
private java.util.Date loanDate;
/** Default constructor */
public Loan() {
this(2.5, 1, 1000);
}
/** Construct a loan with specified annual interest rate,
number of years and loan amount
*/
public Loan(double annualInterestRate, int numberOfYears,double loanAmount){
if(loanAmount <= 0)
{
throw new IllegalArgumentException("loan must be greater than 0");
}
if(annualInterestRate <= 0)
{
throw new IllegalArgumentException("annual interest rate must be greater than 0");
}
if(numberOfYears <= 0)
{
throw new IllegalArgumentException("Year must be greater than 0");
}
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;
}
}
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