责任链模式,建造者模式

1.责任链模式

class Request{
    String requset=new String();
}
class Response{
    String response=new String();
}
interface Filter{
    void doFilter(Request request,Response response,FilterChain chain);
}
class Filter1 implements Filter{
    @Override
    public void doFilter(Request request, Response response, FilterChain chain) {
        request.requset+="责任链1";
        System.err.println("责任链1");
        chain.doFilter(request,response);
        response.response+="责任链1";
    }
}
class Filter2 implements Filter{
    @Override
    public void doFilter(Request request, Response response, FilterChain chain) {
        request.requset+="责任链2";
        System.err.println("责任链2");
        chain.doFilter(request,response);
        response.response+="责任链2";
    }
}
class Filter3 implements Filter{
    @Override
    public void doFilter(Request request, Response response, FilterChain chain) {
        request.requset+="责任链3";
        System.err.println("责任链3");
        chain.doFilter(request,response);
        response.response+="责任链3";
    }
}
class FilterChain{
    private List<Filter> li=new ArrayList<>();
    private int index=0;
    FilterChain add(Filter filter){
        li.add(filter);
        return this;
    }
    void doFilter(Request request,Response response){
        if (index>=li.size()) return;
        Filter filter=li.get(index);
        ++index;
        filter.doFilter(request,response,this);
    }
}
public class Test {
    public static void main(String[] args){
        FilterChain filterChain=new FilterChain();
        filterChain.add(new Filter1())
                .add(new Filter2())
                .add(new Filter3());
        Request request=new Request();
        Response response=new Response();
        filterChain.doFilter(request,response);
        System.err.println("request="+request.requset);
        System.err.println("response="+response.response);
    }
}

2.建造者模式