If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza. 她首先帮着老祖母戒了酒；又把调皮捣蛋的孩子调教成懂礼貌，身心健康的人；帮大姑保住婚姻；并将“丈夫”卡洛斯·丹尼尔，由一个生性软弱对富人言听计从的人，变成一个有主见的成功强人。而祖传下来的家族企业濒临倒闭，也开始起死回生。2417一名女子在死后突然醒来，她开始对血产生贪婪的渴望，而这有可能给她家族衰败的殡仪馆生意带来希望。1. The borrower is required to repay the principal and interest on a monthly basis. In this way, the amount to be repaid each month is very small and the repayment pressure is also small. The lender can receive the repayment on a monthly basis with little risk. 2. Credit audit introduces socialization factors. That is, the borrower's ID card, account book, marriage certificate, academic certificate, etc. can all increase personal credit scores, but these data do not need to be provided with the original, and their authenticity is difficult to be effectively guaranteed. Therefore, the auction believes that the online community and users' online circle of friends are also one of the important parts of their credit rating system. The more friends and members' friends in the inner circle of the website, the higher the number of times individuals borrow and lend, and the higher the credit rating. In this way, the network activity and the user's personal identity, financial ability, bank credit, etc. together form a complete set of evaluation system. The unsecured and unsecured mode has only credit requirements for the borrower but no mortgage, and does not assume guarantee responsibility for the lender. The lender and the borrower trade on their own, and the auction only exists as a witness and trading platform. Therefore, in fact, this form is relatively risky for lenders. However, the winning interest rate for auction is often above 15%, which is still a great temptation for lenders. Therefore, investment in auction and loan has higher risks and higher returns. Because the transaction is concluded in the form of competitive bidding and both parties to the transaction are free to trade, the auction and loan belong to pure intermediary P2P. The auction will blacklist the borrower who fails to repay the loan within the time limit and make it public, but it will not compensate the lender for the economic losses. The auction will only refund the lender's handling fee, so the potential risks of fund recovery can only be borne by the lender itself.Prepare necessary equipment and facilities.String array [] = exp.split (opt);
