Page 381 - Cs_withBlue_J_C11_Flipbook
P. 381
dout.writeUTF(productN);
dout.writeDouble(price);
dout.writeInt(quantity);
dout.writeInt(reorder);
}
}
}
catch(EOFException e)
{
System.out.println("=======EOF=========");
eof=true;
}
din.close();fin.close();
dout.close();fout.close();
// Deleting Product.dat and renaming Newproduct.dat as Product.dat
File f1=new File("Product.dat");
f1.delete();
File f2=new File("Newproduct.dat");
boolean b=f2.renameTo(f1);
if(b)
System.out.println("File renamed successfully");
else
System.out.println("File error");
}
void addItem() throws IOException
{
FileOutputStream fout=new FileOutputStream("Newproduct.dat");
DataOutputStream dout=new DataOutputStream(fout);
FileInputStream fin=new FileInputStream("Product.dat");
DataInputStream din=new DataInputStream(fin);
int ino,qty;
System.out.println("Enter item number");
ino=sc.nextInt();
System.out.println("Enter quantity bought");
qty=sc.nextInt();
boolean eof=false;
try
{
while(!eof)
{
productC = din.readInt();
productN=din.readUTF();
price=din.readDouble();
quantity=din.readInt();
reorder=din.readInt();
if(productC==ino) //If product code matches
{
quantity=quantity + qty;
} //quantity is added
dout.writeInt(productC);
dout.writeUTF(productN);
379
Basic Input/Output and Data File Handling 379

