? Use the Loan.java class provided with this question on the server side ? The c

Question

? Use the Loan.java class provided with this question on the server side
? The client is a GUI application that sends loan information (Loan Amount, Number of Years, and
Annual Interest Rage) to the server
? The server computes the monthly payment amount and total payment, and it sends the results back
to the client
? The server must also be able to handle multiple clients at a time (multi-threaded)
? See the samples for the client and server sides below:

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) {
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;
}
}

½ Use the Loan.java class provided with this question on the server side ½ The client is a GUI application that sends loan information (Loan Amount, Number of Years, and Annual Interest Rage) to the server ½ The server computes the monthly payment amount and total payment, and it sends the results back to the client ½ The server must also be able to handle multiple clients at a time (multi-threaded) ½ See the samples for the client and server sides below: 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) { 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; } }

Explanation / Answer

import java.awt.*; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.InetAddress; import java.net.ServerSocket; import java.net.Socket; import java.util.Date; import javax.swing.*; public class Exercise03 extends JFrame { private static final long serialVersionUID = 1L; private int ClientNumber = 1; private JTextArea jta = new JTextArea(); public static void main(String[] args) { new Exercise03(); } public Exercise03() { setLayout(new BorderLayout()); add(new JScrollPane(jta), BorderLayout.CENTER); setTitle("Exercise03"); setSize(500, 300); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); setVisible(true); ServerSocket serverSocket = null; try { serverSocket = new ServerSocket(8000); jta.append("Exercise01s started at " + new Date() + ' '); while (true) { Socket socket = serverSocket.accept(); jta.append("Startig thread for client " + ClientNumber + " at + " + new Date() + " "); InetAddress inetAddress = socket.getInetAddress(); jta.append("Client " + ClientNumber + "'s host name is " + inetAddress.getHostName() + " "); jta.append("Client " + ClientNumber + "'s Ip address is " + inetAddress.getHostAddress() + " "); HandleAClient task = new HandleAClient(socket); new Thread(task).start(); ClientNumber++; } } catch (IOException ex) { System.err.println(ex); } } class HandleAClient implements Runnable { private Socket socket; public HandleAClient(Socket socket) { this.socket = socket; } @Override public void run() { try { DataInputStream inputFromClient = new DataInputStream(socket.getInputStream()); DataOutputStream outputToClient = new DataOutputStream(socket.getOutputStream()); while (true) { double interest = inputFromClient.readDouble(); int year = inputFromClient.readInt(); double loanAmount = inputFromClient.readDouble(); Loan loan = new Loan(interest, year, loanAmount); double monthlyPayment = loan.getMonthlyPayment(); double totalPayment = loan.getTotalPayment(); outputToClient.writeDouble(monthlyPayment); outputToClient.writeDouble(totalPayment); jta.append("Annual Interest Rate " + interest + " "); jta.append("Number Of Years " + year + " "); jta.append("Loan Amount " + loanAmount + " "); jta.append("monthlyPayment " + monthlyPayment + " "); jta.append("totalPayment " + totalPayment + " "); } } catch (IOException e) { e.printStackTrace(); } } } 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) { 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; } } }

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