http://www.verejava.com/?id=16999052620463
ackage com.chain.theory;
public class TestHandler
{
public static void main(String[] args)
{
Handler hrHandler=new HrHandler(null);
Handler managerHandler=new ManagerHandler(hrHandler);
Handler financeHandler=new FinanceHandler(managerHandler);
Handler frontHandler=new FrontHandler(financeHandler);
frontHandler.handleRequest("離職");
}
}
package com.chain.theory;
public class ManagerHandler implements Handler
{
private Handler nextHandler;
public ManagerHandler(Handler nextHandler)
{
this.nextHandler=nextHandler;
}
@Override
public void handleRequest(String request)
{
if("審批".equals(request))
{
System.out.println("經理審覈完畢");
if(nextHandler!=null)
nextHandler.handleRequest("批准");
}
}
}
package com.chain.theory;
public class HrHandler implements Handler
{
private Handler nextHandler;
public HrHandler(Handler nextHandler)
{
this.nextHandler=nextHandler;
}
@Override
public void handleRequest(String request)
{
if("批准".equals(request))
{
System.out.println("人事批准");
if(nextHandler!=null)
nextHandler.handleRequest("完畢");
}
}
}
package com.chain.theory;
public interface Handler
{
public void handleRequest(String request);
}
package com.chain.theory;
public class FrontHandler implements Handler
{
private Handler nextHandler;
public FrontHandler(Handler nextHandler)
{
this.nextHandler=nextHandler;
}
@Override
public void handleRequest(String request)
{
if("離職".equals(request))
{
System.out.println("離職申請");
if(nextHandler!=null)
nextHandler.handleRequest("審覈");
}
}
}
package com.chain.theory;
public class FinanceHandler implements Handler
{
private Handler nextHandler;
public FinanceHandler(Handler nextHandler)
{
this.nextHandler=nextHandler;
}
@Override
public void handleRequest(String request)
{
if("審覈".equals(request))
{
System.out.println("財務審覈完畢");
if(nextHandler!=null)
nextHandler.handleRequest("審批");
}
}
}