File Operation(Urgent)

Question

I am a student. I have hand on project. This is handling File.
Now i am in the experiment 3. In experiment 1, I finish my lab.
Experiment 3 is on Inheritance and Polymorphism.
1. customer( Super class )
2. Account1, Account2, Account3 ( Subclass )
3.Bank_Customer(main)
I have two problems. one is Bank_Customer do not know Subclass.
second is my Super class is abstract. So can't instiation object.
//customer.java
public abstract class customer{
private int accId;
private String accName;
private String accAddr;
private String accDob;
private String accPhone;
private double accBal;
private String accType;
public customer(int ids, String names, String addrs, String dobs,
String phones, double bals, String type){
accId=ids; accName=names; accAddr=addrs;
accDob=dobs; accPhone=phones; accBal=bals; accType=type;
public int getId() { return accId; }
public String getName() { return accName; }
public String getAddr() { return accAddr; }
public String getDob() { return accDob; }
public String getPhone() { return accPhone; }
public double getBal() { return accBal; }
public String getType() { return accType; }
public void setId(int ids){ accId = ids; }
public void setName(String names) { accName = names; }
public void setAddr(String addrs) { accAddr = addrs; }
public void setDob(String dobs) { accDob = dobs; }
public void setPhone(String phones) { accPhone = phones; }
public void setBal(double bals) { accBal = bals; }
public void setType( String type ) { accType = type; }
public abstract double final_balance();
//Account1.java
public final class Account1 extends customer{
     private double balance;
     private double saving_interest;
     public Account1( int ids, String names, String addrs, String dobs,
String phones, double bals, String type, double interest){
super( ids, names, addrs, dobs, phones, bals, type );
setInterest( interest );
public void setInterest( double interest ){
     saving_interest = interest;
public double final_balance(){
     for( int i=0; i < 30; i++ ){
          balance = super.getBal();
          balance += balance*saving_interest;
     return balance;
//Account2.java
public class Account2 extends customer{
     private double balance;
     public Account2( int ids, String name, String addrs, String dobs,
String phones, double bals, String type, double interest){
super( ids, name, addrs, dobs, phones, bals, type );
public void setInterest( double interest ){
     interest = 0;
     balance = super.getBal();
public double final_balance(){
     return balance;
//Account3.java
public class Account3 extends customer{
     private double balance;
     private double fix_interest;
     public Account3( int ids, String name, String addrs, String dobs,
String phones, double bals, String type, double interest){
super( ids, name, addrs, dobs, phones, bals, type );
setInterest( interest );
public void setInterest( double interest ){
     fix_interest = interest;
public double final_balance(){
     balance = super.getBal();
     balance = balance + ( fix_interest*30);     
     return balance;
//Bank_Customer.java
import java.io.*;
import javax.swing.*;
import java.util.StringTokenizer;
import java.text.*;
import java.text.DecimalFormat;
import java.util.*;
import java.util.Scanner;
public class Bank_Customer {
static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
static public void displayRecords(int records, customer c1[]){
for(int j=0; j<records; j++){
System.out.println("\nAccunt Id = " + c1[j].getId());
System.out.println("Accunt Name = " + c1[j].getName());
System.out.println("Address = " + c1[j].getAddr());
System.out.println("DOB = " + c1[j].getDob());
System.out.println("Phone Number = " + c1[j].getPhone());
System.out.println("Accunt Balance = " + c1[j].getBal());
System.out.println("Account Type = " + c1[j].getType());
System.out.println("\nNo. of Records Found: " + records);
// static public void deleteRecord( int records, customer c1[] )
static public void updateRecord( int records, customer c1[], double Interest){
     for(int i=0; i<records; i++){
               customer cus;
               int Id = c1.getId();
     String AccName = c1[i].getName();
     String AccAdd = c1[i].getAddr();
     String dob = c1[i].getDob();
     int phone = Integer.parseInt(c1[i].getPhone());
     double accbal = c1[i].getBal();
     String acctype = c1[i].getType();
          //     Account1 acc = new Account1( Id, AccName, AccAdd, dob, phone, accbal, acctype, Interest );
               //Account1 acc = new Account1();
               //cus = acc;
          acc.setInterest(Interest);
          System.out.println("The updated balance are :");
          System.out.println("Name =" + acc.getName() );
          System.out.print("Balance =" + acc.final_balance() );
public static void main(String[] args){
customer c1[]; //= new customer[100];
//for(int k=0; k<100; k++){
// c1[] = new customer(0, " ", " ", " ", " ", 0, "");
Account1 acc1[] = new Account1(0,"","","","",0,"");
//Account2 acc2[] = new Account2(0,"","","","",0,"");
//Account3 acc3[] = new Account3(0,"","","","",0,"");
c1[] = acc1[];
String strr;
char charArray[] = new char[1];
int records=0;
try {
for (;;) {
System.out.println("\n\n==================================");
System.out.println("\nEnter 1 to get customers Input Data");
System.out.println("Enter 2 to Display the customers Data");
System.out.println("Enter 3 to Output the customers Data");
System.out.println("Enter 4 to Delete the customers Data");
System.out.println("Enter 5 to Update the Interest rate in Saving and Fix Deposit Account");
System.out.println("Enter q(or Q) to Quit\n");
System.out.println("==================================");
strr = br.readLine();
if (strr == null)
break;
strr.getChars(0,1,charArray,0);
// System.out.println(charArray[0]);
switch (charArray[0]){
case '1':
System.out.print("\nEnter File Name: ");
/* Get input file name */
try{
for(;;){
strr = br.readLine();
if (strr == null)
break;
break;
catch (IOException ex) {
System.out.println(ex);
records = 0;
int mCount = 0;
/* Check file exists */
File name = new File(strr);
if (name.exists()){
System.out.println("\nFile exists.\n");
else{
System.out.println("\nFile does not exist.\n");
BufferedReader input = new BufferedReader( new FileReader(name));
String text;
StringTokenizer st;
int tCount;
String rdTokens = new String();
int rdAccno;
String rdName = new String();
String rdAddr = new String();
String rdDob = new String();
String rdPhone = new String();
String rdType = new String();
double rdBal = 0;
for(;;){
text = input.readLine();
if (text == null){
System.out.println("No. of Valid Records Found: " + records);
break;
st = new StringTokenizer(text);
tCount = st.countTokens();
if(tCount != 0){
rdTokens = st.nextToken();
if(rdTokens.equals("Id")){
rdTokens = st.nextToken();
if (rdTokens.equals("Id")){
rdTokens = st.nextToken(); /* rdTokens = "=" */
rdTokens = st.nextToken();
rdAccno = Integer.parseInt(rdTokens);
text = input.readLine(); /* reading -- Name */
st = new StringTokenizer(text);
tCount = st.countTokens();
rdTokens = st.nextToken();
if(rdTokens.equals("Name")){
rdTokens = st.nextToken(); /* rdTokens = "=" */
for(int l2=2; l2<tCount; l2++){
rdTokens = st.nextToken();
rdTokens = rdTokens.toUpperCase();
if(l2 == 2){
rdName = rdTokens;
else{
rdName = rdName+" "+rdTokens;
if(l2 == (tCount-1)){
rdName = rdName;
} /* end for */
} /* "Name" if */
else{
//System.out.println("\nInput file format error.");
} /* Name else */
text = input.readLine(); /* reading -- Address */
st = new StringTokenizer(text);
tCount = st.countTokens();
rdTokens = st.nextToken();
if(rdTokens.equals("Address")){
rdTokens = st.nextToken(); /* rdTokens = "=" */
for(int l3=2; l3<tCount; l3++){
rdTokens = st.nextToken();
if(l3 == 2){
rdAddr = rdTokens;
else{
rdAddr = rdAddr+" "+rdTokens;
if(l3 == (tCount-1)){
rdAddr = rdAddr;
} /* end if */
} /* end for */
} /* "Address" if */
else{
//System.out.println("\nInput file format error.");
} /* "Address" else */
text = input.readLine(); /* reading -- DOB */
st = new StringTokenizer(text);
tCount = st.countTokens();
rdTokens = st.nextToken();
if(rdTokens.equals("DOB")){
rdTokens = st.nextToken();
rdDob = st.nextToken();
else{
//System.out.println("\nInput file format error.");
text = input.readLine(); /* reading -- Phone Number */
st = new StringTokenizer(text);
tCount = st.countTokens();
rdTokens = st.nextToken();
if(rdTokens.equals("Phone")){
rdTokens = st.nextToken();
rdTokens = st.nextToken();
rdPhone = st.nextToken();
else{
//System.out.println("\nInput file format error.");
text = input.readLine(); /* reading -- Account Balance */
st = new StringTokenizer(text);
tCount = st.countTokens();
rdTokens = st.nextToken();
if(rdTokens.equals("Account")){
rdTokens = st.nextToken();
rdTokens = st.nextToken();
rdTokens = st.nextToken();
rdBal = Double.parseDouble(rdTokens);
else{
//System.out.println("\nInput file format error.");
text = input.readLine(); /* reading --- Account Type */
st = new StringTokenizer(text);
tCount = st.countTokens();
rdTokens = st.nextToken();
if(rdTokens.equals("Account Type")){
     rdTokens = st.nextToken();
     rdTokens = st.nextToken();
     rdTokens = st.nextToken();
     rdTokens = st.nextToken();
     rdType = st.nextToken();
//Debug point
//System.out.println(rdAccno);
//System.out.println(rdName);
//System.out.println(rdAddr);
//System.out.println(rdDob);
//System.out.println(rdPhone);
//System.out.println(rdBal);
if(records == 0){
c1[records].setId(rdAccno);
c1[records].setName(rdName);
c1[records].setAddr(rdAddr);
c1[records].setDob(rdDob);
c1[records].setPhone(rdPhone);
c1[records].setBal(rdBal);
c1[records].setType(rdType);
records++;
else{
for(int k=0; k<records; k++){
if(c1[k].getName().equals(rdName)){
mCount++;
if(mCount == 0){
c1[records].setId(rdAccno);
c1[records].setName(rdName);
c1[records].setAddr(rdAddr);
c1[records].setDob(rdDob);
c1[records].setPhone(rdPhone);
c1[records].setBal(rdBal);
c1[records].setType(rdType);
records++;
int NoSwitches;
do{
NoSwitches = 1;
for(int c=0; c<(records-1); c++){
int tempId1;
String tempName1, tempName2;
String tempAddr1;
String tempDob1;
String tempPhone1;
double tempBal1;
String tempType1;
tempName1 = c1[c].getName();
tempName2 = c1[c+1].getName();
if(tempName1.compareTo(tempName2) > 0){
tempId1 = c1[c].getId();
tempName1 = c1[c].getName();
tempAddr1 = c1[c].getAddr();
tempDob1 = c1[c].getDob();
tempPhone1 = c1[c].getPhone();
tempBal1 = c1[c].getBal();
tempType1 = c1[c].getType();
c1[c].setId(c1[c+1].getId());
c1[c].setName(c1[c+1].getName());
c1[c].setAddr(c1[c+1].getAddr());
c1[c].setDob(c1[c+1].getDob());
c1[c].setPhone(c1[c+1].getPhone());
c1[c].setBal(c1[c+1].getBal());
c1[c].setType(c1[c+1].getType());
c1[c+1].setId(tempId1);
c1[c+1].setName(tempName1);
c1[c+1].setAddr(tempAddr1);
c1[c+1].setDob(tempDob1);
c1[c+1].setPhone(tempPhone1);
c1[c+1].setBal(tempBal1);
c1[c+1].setType(tempType1);
NoSwitches = 0;
}while (NoSwitches == 0);
else{
//records++;
//records--;
} /* "Id" if */
else{ /* "Id" else */
//System.out.println("\nInput file format error.");
} /* "Account" if */
else{ /* "Account" else */
//System.out.println("\nInput file format error.");
} /* tCount if */
else{ /* tCount else */
/* Empty line. */
} /* end infinite for */
System.out.println("\n" + mCount + " same accounts info found.");
System.out.println("\nNeglecting duplicate entries.......");
break;
case '2':
displayRecords(records, c1);
break;
case '3':
/* writeFile();*/
File inputFile = new File("customers.txt");
File outputFile = new File("customers_out.txt");
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
int c;
while ((c = in.read()) != -1)
out.write(c);
in.close();
out.close();
               case '5' :
               String interest = new String();
               try{
for(;;){
interest = br.readLine();
if (strr == null)
break;
break;
catch (IOException ex) {
System.out.println(ex);
               double Interest = Double.parseDouble(interest);
               updateRecord( records, c1, Interest);
               break;
case 'q':
case 'Q':
/* System.out.println("Q"); */
System.exit(0);
break;
default:
System.out.println("\nTry again.");
break;
} /* swith end */
} /* for end */
} /* try end */
catch (IOException ex) {
System.out.println(ex);
(a) Re-declare Customer as a super class with 3 sub-classes, Account1, Account2 and Account3. Account1 is a saving account that receives daily interest. Account2 is a checking account that gets no interest. Account3 is a fixed deposit account with a fixed daily interest rate. One example of the input file is illustrated in Appendix A.
(b) Write a method deleteRecord that removes a customer record from the ordered array (or arrays). When removing an existing record, a void (empty) slot will result.
(c) Write a method update that computes the balance of each account at end of a month (assuming current month has 30 days). The interest should be computed in compound interest manner (i.e. at the end of each day, compute daily interest on capital and the accumulated interest so far). Make use of polymorphism here to have one update method that can work for all different types of accounts.
(d) Write a method menu that displays all the methods for test run. The lab markers can select method 1, 2, 3, 4, 5 or Q to input data, display data, output data, delete record, update and quit in any order such that it is possible for the markers to input or output data more than once. For command 4, the program should prompt and read in the account id to be deleted. For command 5, the program should prompt for the current interest rate for the saving account.
I am a student. I am not lazy man. I try it. As you see in my coding.
Please send me suggestion.

Answer 1

account is a subclass of customer?
an account IS-A customer? Sounds like composition and HAS-A is more appropriate to me. a customer HAS one or more accounts.
who wrote this assignment?
can't tell what your real problem is, but it looks like there's too much code, with little of it pertaining to customers and accounts.
whenever I see case statements, i think somebody ought to do a better job of using polymorphism. but then you're a student.
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