(Restore objects from a file) Suppose a file named Exercise17_07.dat has been created usin...

(Restore objects from a file) Suppose a file named Exercise17_07.dat has been created using the ObjectOutputStream. The file contains Loan objects. The Loan class in Listing 1 does not implement Serializable. Rewrite the Loan class to implement Serializable. Write a program that reads the Loan objects from the file and displays the total loan amount. Suppose you don’t know how many Loan objects are there in the file, use EOFException to end the loop.

LISTING 1 Loan.java

1 public class Loan {
2 private double annualInterestRate;
3 private int numberOfYears;
4 private double loanAmount;
5 private java.util.Date loanDate;
6
7 /** Default constructor */
8 public Loan() {
9 this(2.5, 1, 1000);
10 }
11
12 /** Construct a loan with specified annual interest rate,
13 number of years, and loan amount
14 */
15 public Loan(double annualInterestRate, int numberOfYears,
16 double loanAmount) {
17 this.annualInterestRate = annualInterestRate;
18 this.numberOfYears = numberOfYears;
19 this.loanAmount = loanAmount;
20 loanDate = new java.util.Date();
21 }
22
23 /** Return annualInterestRate */
24 public double getAnnualInterestRate() {
25 return annualInterestRate;
26 }
27
28 /** Set a new annualInterestRate */
29 public void setAnnualInterestRate(double annualInterestRate) {
30 this.annualInterestRate = annualInterestRate;
31 }
32
33 /** Return numberOfYears */
34 public int getNumberOfYears() {
35 return numberOfYears;
36 }
37
38 /** Set a new numberOfYears */
39 public void setNumberOfYears(int numberOfYears) {
40 this.numberOfYears = numberOfYears;
41 }
42
43 /** Return loanAmount */
44 public double getLoanAmount() {
45 return loanAmount;
46 }
47
48 /** Set a new loanAmount */
49 public void setLoanAmount(double loanAmount) {
50 this.loanAmount = loanAmount;
51 }
52
53 /** Find monthly payment */
54 public double getMonthlyPayment() {
55 double monthlyInterestRate = annualInterestRate / 1200;
56 double monthlyPayment = loanAmount * monthlyInterestRate / (1 -
57 (1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12)));
58 return monthlyPayment;
59 }
60
61 /** Find total payment */
62 public double getTotalPayment() {
63 double totalPayment = getMonthlyPayment() * numberOfYears * 12;
64 return totalPayment;
65 }
66
67 /** Return loan date */
68 public java.util.Date getLoanDate() {
69 return loanDate;
70 }
71 }