CODEWITHSUNDEEP
javaexceptioniotry-catch
Nicholas Kong
Nicholas Kong

Reputation: 1153

java io catching exception

I am getting this error:

bill value:$ 0.10
bill value: $0.05
bill value: $0.01
bill value: $100.00
Exception in thread "main" java.io.EOFException
    at java.io.ObjectInputStream$BlockDataInputStream.peekByte(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    at ReadMoney.main(ReadMoney.java:12)

================== My code:

//import java.util.Date;
public class ReadMoney
{
    public static void main(String argv[]) throws Exception
    {
        FileInputStream fis = new FileInputStream("money.out");
        ObjectInputStream ois = new ObjectInputStream(fis);
        Object read;
        try
        {
            while ((read = ois.readObject()) != null)
            {
                if (read instanceof Bill)
                {
                    System.out.println("bill value: " + read);
                }
                else if (read instanceof Quarter)
                {
                }// while
                else if (read instanceof Dime)
                {
                    System.out.println("bill value:" + read);
                }
                else if (read instanceof Nickel)
                {
                    System.out.println("bill value:" + read);
                }
                else if (read instanceof Penny)
                {
                    System.out.println("bill value:" + read);
                }
                else if (read instanceof Bill)
                {
                    System.out.println("bill value:" + read );
                }

            Money quarter = (Money) ois.readObject();
            System.out.println("Quarter: "+ quarter);
            System.out.println("Quarter: "+ quarter);
            Money dime = (Money) ois.readObject();
            System.out.println("Dime:" + dime);
            Money nickel = (Money)ois.readObject();
            System.out.println("Nickel:" + nickel);
            Money penny = (Money) ois.readObject();
            System.out.println("Penny:" + penny);
            Money bill = (Money) ois.readObject();
            System.out.println("Bill: " + bill);
        }// try
        } catch (IllegalBillException ibe)
        {
            System.out.println("End of file reached");
        }
        ois.close();
        fis.close();
    }// main
}// class

I'm pretty sure my try and catch block is correct but my program is not printing the 2 quarters value and also the text saying "end of file reached" for some odd reason. =/

Upvotes: 1

Views: 1427

Answers (2)

Hot Licks
Hot Licks

Reputation: 47729

The problem is that your while condition, which tests for EOF with the null check, doesn't "protect" the stuff after "}// try", and hence the readObject calls after that point will attempt to read beyond EOF and get the exception.

You need to restructure your logic somehow.

Catching EOFException will make the exception "go away" but will not fix your bug.

Upvotes: 0

Ted Hopp
Ted Hopp

Reputation: 234795

You're catching IllegalBillException (whatever that is), but you aren't catching EOFException (or it's superclass, IOException).

Upvotes: 1

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