LoanSerializablejava WriteLoanObjectsjava ReadLoadObjectsjav

LoanSerializable.java, WriteLoanObjects.java, ReadLoadObjects.java, Date.java Write the LoanSerializable.java class to implement Serializable. Write a program WriteLoanObjects.java that creates five Loan objects and stores them in a file named LoanObjects.dat. (Restore objects from a file). Write a program ReadLoanObjects.java 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. Methods and attributes of Loan class

Solution

Please find below the java programs asked in the above questions. I have added the comments for your better understanding. Let me know if any issue. :)

LoanSerializable.java:

public class LoanSerializable implements java.io.Serializable { // To Implement Serializable
   private double annualInterestRate;
   private int numberOfYears;
   private double loanAmount;
   private java.util.Date loanDate;

  
   public LoanSerializable() { /** The Default constructor */
       this(2.5, 1, 1000);
   }

   /** Construct a loan with specified annual interest rate, no, of years, and loan amt */
   public LoanSerializable(double annualInterestRate, int numberOfYears, double loanAmount) {
       this.annualInterestRate = annualInterestRate;
       this.numberOfYears = numberOfYears;
       this.loanAmount = loanAmount;
       loanDate = new java.util.Date();
   }

   /** This will Return annualInterestRate */
   public double getAnnualInterestRate() {
       return annualInterestRate;
   }

   /** This will Set a new annualInterestRate */
   public void setAnnualInterestRate(double annualInterestRate) {
       this.annualInterestRate = annualInterestRate;
   }

   /** This will Return numberOfYears */
   public int getNumberOfYears() {
       return numberOfYears;
   }

   /** This will Set numberOfYears */
   public void setNumberOfYears(int numberOfYears) {
       this.numberOfYears = numberOfYears;
   }

   /** This will Return loanAmount */
   public double getLoanAmount() {
       return loanAmount;
   }

   /** This will Set a new loanAmount */
   public void setLoanAmount(double loanAmount) {
       this.loanAmount = loanAmount;
   }

   /** This will Find monthly payment */
   public double getMonthlyPayment() {
       double monthlyInterestRate = annualInterestRate / 1200;
       double monthlyPayment = loanAmount * monthlyInterestRate / (1 -
           (1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12)));
       return monthlyPayment;
   }

   /** This will Find total payment */
   public double getTotalPayment() {
       double totalPayment = getMonthlyPayment() * numberOfYears * 12;
       return totalPayment;
   }
  
   /** This will Return loan date */
   public java.util.Date getLoanDate() {
       return loanDate;
   }

   @Override /** This will Override the toString method in the Object class */
   public String toString() {
       return \"Date: \" + loanDate + \"\ Annual interest Rate: \" +
           annualInterestRate + \"\ Years: \" + numberOfYears +
           \"\ Loan amount: \" + loanAmount;
   }
}

WriteLoanobjects.java:

import java.io.*;

public class LoanObjects {
   public static void main(String[] args) throws IOException {
       // The below will Create the 5 Loan objects
       Loan loan1 = new Loan();
       Loan loan2 = new Loan(8.25, 5, 120000.95);
       Loan loan3 = new Loan(4.5, 4, 5000);
       Loan loan4 = new Loan(5.0, 5, 10000);
       Loan loan5 = new Loan(5.75, 5, 10000);

       try ( // This will Create an output stream for the file LoanObjects.dat
           ObjectOutputStream output = new ObjectOutputStream(new
               BufferedOutputStream(new FileOutputStream(\"LoanObjects.dat\")));
       ) {
           // The below will Write five Loan objects to the file
           output.writeObject(loan1);
           output.writeObject(loan2);
           output.writeObject(loan3);
           output.writeObject(loan4);
           output.writeObject(loan5);
       }
   }
}

ReadLoanObjects.java:

import java.io.*;

public class LoanObjects {
   public static void main(String[] args)
           throws IOException, ClassNotFoundException {
       try ( // To Create an input stream for file LoanObjects.dat
           ObjectInputStream input = new ObjectInputStream(new
               BufferedInputStream(new FileInputStream(\"LoanObjects.dat\")))
       ) { // This will Read Loan objects from file and display the total loan amount
           while (true) {
               Loan loan = (Loan)input.readObject();
               System.out.println(loan);
               System.out.printf(\"Total loan amount: $%.2f\ \",
                   loan.getTotalPayment());
               System.out.println();
           }
       }
       catch (EOFException ex) {
           // The Use of EOFExecption to end the loop
       }
   }
}