Reading a file of objects sequentially with ObjectInputStream and displaying each record.

Description

Demo Code

import java.io.EOFException;     
import java.io.IOException;      
import java.io.ObjectInputStream;
import java.nio.file.Files;
import java.nio.file.Paths;

public class Main
{
   private static ObjectInputStream input;

   public static void main(String[] args)
   {//  ww w  . j  a va2  s . c om
      openFile();
      readRecords();
      closeFile();
   } 

   // enable user to select file to open
   public static void openFile()
   {
      try // open file
      {
         input = new ObjectInputStream(          
            Files.newInputStream(Paths.get("clients.ser")));
      } 
      catch (IOException ioException)
      {
         System.err.println("Error opening file.");
         System.exit(1);
      } 
   }

   // read record from file
   public static void readRecords()
   {
      System.out.printf("%-10s%-12s%-12s%10s%n", "Account",
         "First Name", "Last Name", "Balance");

      try 
      {
         while (true) // loop until there is an EOFException
         {
            Account record = (Account) input.readObject();

            // display record contents
            System.out.printf("%-10d%-12s%-12s%10.2f%n",  
               record.getAccount(), record.getFirstName(), 
               record.getLastName(), record.getBalance());
         } 
      }
      catch (EOFException endOfFileException)
      {
         System.out.printf("%nNo more records%n");
      } 
      catch (ClassNotFoundException classNotFoundException)
      {
         System.err.println("Invalid object type. Terminating.");
      } 
      catch (IOException ioException)
      {
         System.err.println("Error reading from file. Terminating.");
      } 
   } 

   // close file and terminate application
   public static void closeFile()
   {
      try
      {
         if (input != null)
            input.close();
      } 
      catch (IOException ioException)
      {
         System.err.println("Error closing file. Terminating.");
         System.exit(1);
      } 
   } 
}


class Account implements java.io.Serializable
{
   private int account;
   private String firstName;
   private String lastName;
   private double balance;
   
   // initializes an Account with default values
   public Account() 
   {
      this(0, "", "", 0.0); // call other constructor
   } 
  
   // initializes an Account with provided values
   public Account(int account, String firstName, 
      String lastName, double balance)
   {
      this.account = account;
      this.firstName = firstName;
      this.lastName = lastName;
      this.balance = balance;
   }

   // set account number   
   public void setAccount(int acct)
   {
      this.account = account;
   } 

   // get account number   
   public int getAccount() 
   { 
      return account; 
   } 
   
   // set first name   
   public void setFirstName(String firstName)
   {
      this.firstName = firstName;
   } 

   // get first name   
   public String getFirstName() 
   { 
      return firstName; 
   } 
   
   // set last name   
   public void setLastName(String lastName)
   {
      this.lastName = lastName;
   } 

   // get last name   
   public String getLastName() 
   {
      return lastName; 
   } 
   
   // set balance  
   public void setBalance(double balance)
   {
      this.balance = balance;
   } 

   // get balance   
   public double getBalance() 
   { 
      return balance; 
   } 
}
Reading a file of objects sequentially with ObjectInputStream and displaying each record. - Java File Path IO

Description

Demo Code

Result

Related Tutorials
