添加Java开发环境

Dockerfile

@@ -23,6 +23,8 @@ RUN apt-get update && \
         iputils-ping \
         python3 \
         python3-pip \
+        openjdk-11-jdk \
+        maven \
         sudo && \
     rm -rf /var/lib/apt/lists/*
 
@@ -80,6 +82,7 @@ RUN mkdir -p "$DEFAULT_WORKSPACE" && \
     echo "- **Node.js (LTS)**: 通过 nvm 管理" >> "$DEFAULT_WORKSPACE/README.md" && \
     echo "- **Python 3 & pip**" >> "$DEFAULT_WORKSPACE/README.md" && \
     echo "- **Go (Golang)**: Go 开发环境" >> "$DEFAULT_WORKSPACE/README.md" && \
+    echo "- **Java (Java)**: Java 开发环境" >> "$DEFAULT_WORKSPACE/README.md" && \
     echo "- **Git, Vim, curl, wget** 等常用命令行工具" >> "$DEFAULT_WORKSPACE/README.md" && \
     echo "" >> "$DEFAULT_WORKSPACE/README.md" && \
     echo "时区已设置为 \`Asia/Shanghai\`。" >> "$DEFAULT_WORKSPACE/README.md"