Array Data File Operations

Question

I need to print the data out that has been inputted from the user using datainputstream
and dataoutputstream but this is not even taking the inputs properly.Can anyone tell me
what is wrong with my code?

import java.io.*;

class Employee
 {
int id;
String name;
double salary;
 }

public class Ch8Ex2 
 {
   public static void main (String[] args) 
   {
      Employee emp = new Employee();
      try
       {
         File f1 = new File("emp1.dat");
         f1.createNewFile();

         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         DataInputStream da = new DataInputStream(new FileInputStream(f1));
         DataOutputStream ad = new DataOutputStream(new FileOutputStream(f1));

         System.out.println("Enter your ID:");
         emp.id = br.read();
         System.out.println("Enter your name:");
         emp.name = br.readLine();
         System.out.println("Enter your salary:");
         String str = br.readLine();
         emp.salary = Double.parseDouble(str);

         ad.write(emp.id);
         ad.writeUTF(emp.name);
         ad.writeDouble(emp.salary);

         ad.flush();
         ad.close();

         System.out.println("ID:"+da.readInt());

         System.out.println("Name:"+da.readUTF());

         System.out.println("Salary:"+da.readDouble());

         da.close();
       }
        catch(IOException e)
        {

        }
        catch(NumberFormatException e)
        {

        }
     }
}

Waqas Ilyas · Accepted Answer · 2013-01-01 12:35:02Z

2

You need to use ad.writeInt(emp.id) because ad.write(int) only writes a single byte.

answered Jan 1, 2013 at 12:35

Waqas Ilyas

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1 Comment

Robin Over a year ago

Such small mistakes make me mad Dx thank you so much...its all fixed now :)

Bernhard Barker · Accepted Answer · 2013-01-01 12:26:36Z

2

Assuming this is the only thing

emp.id = br.read();

should be

emp.id = Integer.parseInt(br.readLine());

BufferedReader.read() reads a single character

Unless of course id is just a single character.

answered Jan 1, 2013 at 12:26

Bernhard Barker

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1 Comment

Robin Over a year ago

Thank youuu :D The inputs are being taken properly now...but it is still not showing the values entered.

vels4j · Accepted Answer · 2013-01-01 12:11:57Z

1

Class Employee must be Serializable

 class Employee implements Serializable
 {
   int id;
   String name;
   double salary;
 }

also print exception in catch block then you can get what is wrong.

answered Jan 1, 2013 at 12:11

vels4j

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1 Comment

Robin Over a year ago

Ok I made it serializable but I am still getting the same problem. It takes the employee id but then asks for both the name ans salary together. I type some name and then it gives numberformatexception.

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