Question

In my StockTransaction.java, this runs first

try{
        FileOutputStream fos = new FileOutputStream("C:"+File.separatorChar+"transactions.dat"); 
        OutputStreamWriter osw = new OutputStreamWriter(fos); 
        BufferedWriter writer = new BufferedWriter(osw); 
        writer.append(aStockTransaction.toString()); 
        writer.append("******This Transaction ends Here.*****");
        writer.flush(); 
        writer.close();}

Then in my brokerageAccount.java,this runs last

try {   
                    FileOutputStream fos = new FileOutputStream("C:"+File.separatorChar+"transactions.dat"); 

        OutputStreamWriter osw = new OutputStreamWriter(fos); 
        BufferedWriter writer = new BufferedWriter(osw); 
        writer.append(brokerageAcc1.toString()); 
        writer.append("******This is end of File*****");
        writer.flush(); 
        writer.close();
        //System.out.println(brokerageAcc1.toString());

} 

I tested with System.out.println to console, the output is fine.
But The end file only show the brokerAcc1.toString(), nothing for aStockTransaction.toString().
Why? How to solve it? Thanks in advance!

Answer 1

You need to use FileOutputStream(filename, true) in order to append to an existing file.