在latex中嵌套java 代码

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{inconsolata}
\usepackage{ctex}
\usepackage{color}
\definecolor{pblue}{rgb}{0.13,0.13,1}
\definecolor{pgreen}{rgb}{0,0.5,0}
\definecolor{pred}{rgb}{0.9,0,0}
\definecolor{pgrey}{rgb}{0.46,0.45,0.48}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\usepackage{listings}

\lstset{
	backgroundcolor=\color{green}, % 选择代码背景，必须加上\ usepackage {color}或\ usepackage {xcolor}.
	frame=single,
	rulecolor=\color{red},
	language=Java,
	aboveskip=3mm,
	belowskip=3mm,
	showspaces=false,
	showtabs=false,
	columns=flexible,
	breaklines=true,
	tabsize=2,
	numbers=left,
	numbersep=-5pt, 
	numberstyle=\tiny\color{red},
	showstringspaces=false,
	breakatwhitespace=true,%设置是否当且仅当在空白处自动中断.
	commentstyle=\color{pgreen},
	keywordstyle=\color{pblue},
	stringstyle=\color{pred},
	basicstyle=\ttfamily,% 设置代码字号.
	moredelim=[il][\textcolor{pgrey}]{$$},
	moredelim=[is][\textcolor{pgrey}]{\%\%}{\%\%}	
}

\begin{document}
	
	\section{抽象产品}
	
	\begin{lstlisting}
	package com.china.shanghai.wanson;
		
	public abstract class Product {
	public abstract void show();
	}
	\end{lstlisting}
	
	\section{具体产品}
	
	\begin{lstlisting}
	
	package com.china.shanghai.wanson;
	
	public class ConcreteProduct1 extends Product {
	@Override
	public void show() {
	System.out.println("产品1");
	}
	}
	
	package com.china.shanghai.wanson;
	
	public class ConcreteProduct2 extends Product {
	@Override
	public void show() {
	System.out.println("产品2");
	}
	}
	\end{lstlisting}
	
	\begin{lstlisting}
	\end{lstlisting}
\end{document}