编辑“︁Java责任链模式”︁（章节）

== 代码示例 ==
以下是一个简单的审批流程示例：

<syntaxhighlight lang="java">
// 抽象处理者
abstract class Approver {
    protected Approver successor;

    public void setSuccessor(Approver successor) {
        this.successor = successor;
    }

    public abstract void processRequest(PurchaseRequest request);
}

// 具体处理者：经理
class Manager extends Approver {
    @Override
    public void processRequest(PurchaseRequest request) {
        if (request.getAmount() <= 1000) {
            System.out.println("Manager approves purchase #" + request.getNumber());
        } else if (successor != null) {
            successor.processRequest(request);
        }
    }
}

// 具体处理者：总监
class Director extends Approver {
    @Override
    public void processRequest(PurchaseRequest request) {
        if (request.getAmount() <= 5000) {
            System.out.println("Director approves purchase #" + request.getNumber());
        } else if (successor != null) {
            successor.processRequest(request);
        }
    }
}

// 请求类
class PurchaseRequest {
    private int number;
    private double amount;

    public PurchaseRequest(int number, double amount) {
        this.number = number;
        this.amount = amount;
    }

    // getters...
}

// 客户端
public class ChainOfResponsibilityDemo {
    public static void main(String[] args) {
        Approver manager = new Manager();
        Approver director = new Director();
        
        manager.setSuccessor(director);
        
        // 创建不同金额的采购请求
        manager.processRequest(new PurchaseRequest(1, 500));
        manager.processRequest(new PurchaseRequest(2, 2500));
        manager.processRequest(new PurchaseRequest(3, 6000));
    }
}
</syntaxhighlight>

输出结果：
<pre>
Manager approves purchase #1
Director approves purchase #2
</pre>