比较 Java 中的嵌套 ArrayList 对象：根据服务详细信息查找事务-解网

问：

我正在开发一个 Java 程序，我需要根据服务详细信息找到特定的事务。该计划包括三个类：客户、交易和服务。Customer 有一个 Transaction 对象的 ArrayList，每个 Transaction 都包含一个 Service 对象的 ArrayList。Service 类具有 ServiceType（枚举）、serviceName、price 和名为 mechanics 的 Employee 对象的 ArrayList 等属性。

我的挑战是在 Customer 类中实现一个方法 findTransaction。此方法应根据作为参数提供的服务详细信息来查找事务。但是，我正在努力将嵌套 ArrayLists 中的 Service 对象与给定的参数进行比较。

尝试从 Customer 类访问 Service 类 getter 时遇到“无法解析符号”错误。我怀疑我访问和比较嵌套 ArrayList 对象的方法可能不正确，但我不确定如何继续。

这是我当前实现的简化版本：

客户类

public class Customer { 私有 ArrayList 事务;

public Customer() {
    this.transactions = new ArrayList<>();
}

// Method to find a transaction based on service details
public Transaction findTransaction(ServiceType serviceName, double price, Employee mechanic) {
    for (Transaction transaction : transactions) {
        if (transaction.containsService(serviceName, price, mechanic)) {
            return transaction;
        }
    }
    return null;
}

}

TRANSACTIONS 类

public class Transaction {
private ArrayList<Service> services;

public Transaction() {
    this.services = new ArrayList<>();
}

// Helper method to check if a specific service exists in this transaction
public boolean containsService(ServiceType serviceName, double price, Employee mechanic) {
    for (Service service : services) {
        if (service.matches(serviceName, price, mechanic)) {
            return true;
        }
    }
    return false;
}

}

服务等级

public class Service {
private ServiceType serviceName;
private double price;
private ArrayList<Employee> mechanics;

public Service(ServiceType serviceName, double price) {
    this.serviceName = serviceName;
    this.price = price;
    this.mechanics = new ArrayList<>();
}

// Helper method to check if this service matches the given details
public boolean matches(ServiceType serviceName, double price, Employee mechanic) {
    return this.serviceName.equals(serviceName) &&
           this.price == price &&
           this.mechanics.contains(mechanic);
}

}

Java OOP 调试 ArrayList 比较

class ServiceComperator implements Comparator<Service>{
      

       // Overriding the compare method to sort the age 
       public int compare(Service s1, Service s2) {
          if (s1.field==s2.field&&s1.field1==s2.field1 etc...)
           {
              return 0;
           }
          else
          {
             return -1;
          }
       }

和你的比较方法：

private Transaction findTransaction(Service serviceName, double price, Employee mechanic){
           ServiceComperator comperator=new ServiceComperator();
           Service dummyService=createDummyService();
           for(int i=0; i<this.transactioins.size(); i++){
                Transaction chkedTransaction = this.transactioins.get(i);
                List<Service> services=chkedTransaction.getServices(getServiceName, getPrice, getMechanics);
                for (Service currentService : services) {
                    if (comperator.compare(dummyService, chkedTransaction.service())==0)
                    {
                        //they are equal do something
                    }
                    else
                    {
                        //they arent do something else
                    }
                }
                
            }
       }

 private Service createDummyService(params)
       {
       //create a service object based on the fields you want to compare
       }

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比较 Java 中的嵌套 ArrayList 对象：根据服务详细信息查找事务

Comparing Nested ArrayList Objects in Java: Finding Transactions Based on Service Details

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