行为型模式-职责链

最新推荐文章于 2025-07-27 22:45:34 发布

原创最新推荐文章于 2025-07-27 22:45:34 发布 · 485 阅读

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#设计 #java

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本文介绍了一种使用Java实现的责任链模式案例。通过定义一个抽象类Chain来处理请求，并且可以将多个请求处理者Chain连接起来形成一条责任链。具体的责任处理类ConcreteChain1、ConcreteChain2和ConcreteChain3分别负责处理不同范围内的请求。每个处理者可以在处理完请求后将请求传递给链上的下一个处理者，从而实现了请求处理职责的分配。

客户端

public static void main(String[] args) {
		Chain c1 = new ConcreteChain1();
		Chain c2 = new ConcreteChain2();
		Chain c3 = new ConcreteChain3();
		c1.setSuccessor(c2);
		c2.setSuccessor(c3);
		int[] requests = { 2, 4, 6, 14, 23, 18 };
		for (int req : requests) {
			c1.handleRequest(req);
		}
}

类设计

public abstract class Chain {
	private Chain successor;


	public Chain getSuccessor() {
		return successor;
	}


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


	public abstract void handleRequest(int request);
}
public class ConcreteChain1 extends Chain {


	@Override
	public void handleRequest(int request) {
		if (request >= 0 && request < 10) {
			System.out.println(request + ":process request in ConcreteChain1");
		} else {
			if (getSuccessor() != null)
				getSuccessor().handleRequest(request);
		}
	}


}
public class ConcreteChain2 extends Chain {


	@Override
	public void handleRequest(int request) {
		if (request >= 10 && request < 20) {
			System.out.println(request + ":process request in ConcreteChain2");
		} else {
			if (getSuccessor() != null)
				getSuccessor().handleRequest(request);
		}
	}


}
public class ConcreteChain3 extends Chain {


	@Override
	public void handleRequest(int request) {
		if (request >= 20 && request < 30) {
			System.out.println(request + ":process request in ConcreteChain3");
		} else {
			if (getSuccessor() != null)
				getSuccessor().handleRequest(request);
		}
	}


}