Java编程中if else写全好还是只写if好！！！

  今天遇到一个问题，同事问我，ifelse是一个整体，是写全好还是只写一个if好？

  我的理接是，对于代码可读性来说，只写一个if比较直观，而且可读性也很强。但是今天我翻看springcloud的源码时发现

class反编译：

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        try {
            ......

            if (!RequestContext.getCurrentContext().sendZuulResponse()) {
                filterChain.doFilter(servletRequest, servletResponse);
            } else {
                try {
                    this.routing();
                } catch (ZuulException var13) {
                    this.error(var13);
                    this.postRouting();
                    return;
                }

                try {
                    this.postRouting();
                } catch (ZuulException var11) {
                    this.error(var11);
                }
            }
        } catch (Throwable var14) {
            this.error(new ZuulException(var14, 500, "UNCAUGHT_EXCEPTION_FROM_FILTER_" + var14.getClass().getName()));
        } finally {
            RequestContext.getCurrentContext().unset();
        }
    }

下载源码：

@Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        try {
            ......
            
            // Only forward onto to the chain if a zuul response is not being sent
            if (!RequestContext.getCurrentContext().sendZuulResponse()) {
                filterChain.doFilter(servletRequest, servletResponse);
                return;
            }
            
            try {
                routing();
            } catch (ZuulException e) {
                error(e);
                postRouting();
                return;
            }
            try {
                postRouting();
            } catch (ZuulException e) {
                error(e);
                return;
            }
        } catch (Throwable e) {
            error(new ZuulException(e, 500, "UNCAUGHT_EXCEPTION_FROM_FILTER_" + e.getClass().getName()));
        } finally {
            RequestContext.getCurrentContext().unset();
        }
    }

源码中else不见了，class文件中却有；

让读者看起来比较容易理解， 就是好的风格。 

可能是反编译工具为了保证代码正确性加上的else；