acount.java

class account{
  int totalBalance = 0;
  
  // then call data from DB
  // show all data
  int row = totalrow;
  if(row>0){
    //take last row
    totalBalance = lastrowBalance;
  }
  
  // now user can insert new credit or debit
  
  if(isCredit){
    totalBalance += (+creditValue);
  }else{
    totalBalance += (-debitValue);
  }
  
  insert-> credit,debit,balance;
}