Loan.java

public class Loan { 

	public static void main(String[] args) {
		//TO DO 
	}
	
	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 (annualInterestRate <= 0 || numberOfYears <= 0 || loanAmount <= 0) {
			throw new IllegalArgumentException();
		}
		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 new loanAmount */ 
	public void setLoanAmount(double loanAmount) { 
		this.loanAmount = loanAmount; } 

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