Java设计模式中单一职责原则详解

// 客户类，负责管理客户信息和交易 

public class Customer { 

     private String name; 

     private int age; 

     private List<Transaction> transactions;

     public Customer(String name, int age) { 

         this .name = name; 

         this .age = age; 

         this .transactions = new ArrayList<>(); 

     }

     public void addTransaction(Transaction transaction) { 

         this .transactions.add(transaction); 

     }

     public void removeTransaction(Transaction transaction) { 

         this .transactions.remove(transaction); 

     }

     public String getName() { 

         return name; 

     }

     public int getAge() { 

         return age; 

     }

     public List<Transaction> getTransactions() { 

         return transactions; 

     } 

}

// 交易类，负责管理交易 

public class Transaction { 

     private String description; 

     private double amount;

     public Transaction(String description, double amount) { 

         this .description = description; 

         this .amount = amount; 

     }

     public String getDescription() { 

         return description; 

     }

     public double getAmount() { 

         return amount; 

     } 

}

// 客户端类，演示单一职责原则的应用 

public class Client { 

     public static void main(String[] args) { 

         // 创建客户对象 

         Customer customer = new Customer( "John" , 30 );

         // 创建交易对象 

         Transaction transaction1 = new Transaction( "Buy Coffee" , 10.00 ); 

         Transaction transaction2 = new Transaction( "Sell Stock" , 50.00 );

         // 添加交易到客户对象 

         customer.addTransaction(transaction1); 

         customer.addTransaction(transaction2);

         // 获取客户信息和交易列表 

         String name = customer.getName(); 

         int age = customer.getAge(); 

         List<Transaction> transactions = customer.getTransactions();

         // 输出客户信息和交易列表 

         System.out.println( "Customer name: " + name + ", age: " + age + ", transactions: " + transactions); 

     } 

}