Page 380 - Cs_withBlue_J_C11_Flipbook
P. 380
dout.writeInt(productC);
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 delRec() throws IOException
{
/*Original file opened in read mode and new file in write mode
All records other than the record to be deleted will be written
to the new file. Original file is deleted and the new file is
renamed to previous original file*/
FileOutputStream fout=new FileOutputStream("Newproduct.dat");
DataOutputStream dout=new DataOutputStream(fout);
FileInputStream fin=new FileInputStream("Product.dat");
DataInputStream din=new DataInputStream(fin);
int ino;
System.out.println("Enter Product code to delete");
ino=sc.nextInt();
boolean eof=false;
try
{
while(!eof)
{
productC=din.readInt();
productN=din.readUTF();
price=din.readDouble();
quantity=din.readInt();
reorder=din.readInt();
//If product code does not match then the records are written to Newproduct.dat
if(productC!=ino)
{
dout.writeInt(productC);
378378 Touchpad Computer Science-XI

