Java/com/study/demo4/PaymentFactory.java

package com.study.demo4;

class PaymentFactory {
  public static PaymentProcessor getProcessor(String type) {
    switch (type.toLowerCase()) {
      case "wechat":
        return new WechatPayment();
      case "alipay":
        return new AlipayPayment();
      case "card":
        return new CreditCardPayment();
      default:
        throw new IllegalArgumentException("不支持的支付方式");
    }
  }
}