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Saturday, 7 January 2017

Chapter 17 Exercise 6, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

17.6 (Store Loan objects)
The Loan class in Listing 10.2 does not implement Serializable.
Rewrite the Loan class to implement Serializable. Write a program
that creates five Loan objects and stores them in a file named Exercise17_06.dat.

import java.io.Serializable;

public class Loan implements Serializable {
    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) {
        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 -
                (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;
    }
}

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class Exercise_06 {

    public static void main(String[] args) throws IOException {

        File file = new File("Exercise17_06.dat");

        try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(file))) {

            for (int i = 0; i < 5; i++) {
                out.writeObject(new Loan(0.6, 23, 50 + (Math.random() * 101)));
            }
        }
    }
}

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