refactor JDK installation to use SDKMAN!

Replaces manual installation of JDK 21 and 25 with SDKMAN! for better version management. Consolidates system dependencies for pyenv into the main dependencies installation step. Updates environment variables and .bashrc configuration to reflect the use of SDKMAN! and the new JAVA_HOME path. Adds version checks for Python and Conda in the final environment setup output.

Author: Pleasurecruise

Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu:latest
 ENV DEBIAN_FRONTEND=noninteractive
 ENV TZ=Asia/Shanghai
 
-# 安装基本工具和库
+# 安装系统依赖需求
 RUN apt-get update && apt-get upgrade -y && apt-get install -y \
     neofetch \
     build-essential \
@@ -22,6 +22,13 @@ RUN apt-get update && apt-get upgrade -y && apt-get install -y \
     software-properties-common \
     zip \
     unzip \
+    libbz2-dev \
+    libreadline-dev \
+    libsqlite3-dev \
+    libssl-dev \
+    libffi-dev \
+    liblzma-dev \
+    zlib1g-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # 安装 NVM 
@@ -42,17 +49,6 @@ RUN . "$NVM_DIR/nvm.sh" \
     && corepack prepare yarn@stable --activate \
     && npm install -g bun
 
-# 安装 pyenv 依赖
-RUN apt-get update && apt-get install -y \
-    libbz2-dev \
-    libreadline-dev \
-    libsqlite3-dev \
-    libssl-dev \
-    libffi-dev \
-    liblzma-dev \
-    zlib1g-dev \
-    && rm -rf /var/lib/apt/lists/*
-
 # 安装 pyenv
 ENV PYENV_ROOT=/root/.pyenv
 ENV PATH=$PYENV_ROOT/shims:$PYENV_ROOT/bin:$PATH
@@ -82,17 +78,17 @@ RUN pip install --no-cache-dir \
     scikit-learn \
     requests
 
-# 安装 JDK 21 和 25
-RUN apt-get update && apt-get install -y openjdk-21-jdk \
-    && rm -rf /var/lib/apt/lists/*
-
-# 安装 JDK 25 (从 Oracle 或其他源)
-RUN wget https://download.oracle.com/java/25/latest/jdk-25_linux-x64_bin.tar.gz \
-    && mkdir -p /usr/lib/jvm \
-    && tar -xzf jdk-25_linux-x64_bin.tar.gz -C /usr/lib/jvm \
-    && rm jdk-25_linux-x64_bin.tar.gz
-
-ENV JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64
+# Install SDKMAN! and manage multiple JDK versions
+ENV SDKMAN_DIR=/root/.sdkman
+ENV JAVA21_VERSION=21.0.5-tem
+ENV JAVA25_VERSION=25.ea.1-open
+RUN curl -s "https://get.sdkman.io" | bash \
+    && bash -c "source $SDKMAN_DIR/bin/sdkman-init.sh \
+        && sdk install java ${JAVA21_VERSION} \
+        && sdk install java ${JAVA25_VERSION} \
+        && sdk default java ${JAVA21_VERSION}"
+
+ENV JAVA_HOME=$SDKMAN_DIR/candidates/java/current
 ENV PATH=$JAVA_HOME/bin:$PATH
 
 # 安装 Maven
@@ -130,8 +126,10 @@ RUN echo '' >> /root/.bashrc \
     && echo 'export CONDA_DIR="/opt/conda"' >> /root/.bashrc \
     && echo 'export PATH="$CONDA_DIR/bin:$PATH"' >> /root/.bashrc \
     && echo '' >> /root/.bashrc \
-    && echo '# Java configuration' >> /root/.bashrc \
-    && echo 'export JAVA_HOME="/usr/lib/jvm/java-21-openjdk-amd64"' >> /root/.bashrc \
+    && echo '# SDKMAN configuration' >> /root/.bashrc \
+    && echo 'export SDKMAN_DIR="/root/.sdkman"' >> /root/.bashrc \
+    && echo '[ -s "$SDKMAN_DIR/bin/sdkman-init.sh" ] && source "$SDKMAN_DIR/bin/sdkman-init.sh"' >> /root/.bashrc \
+    && echo 'export JAVA_HOME="$SDKMAN_DIR/candidates/java/current"' >> /root/.bashrc \
     && echo 'export PATH="$JAVA_HOME/bin:$PATH"' >> /root/.bashrc \
     && echo '' >> /root/.bashrc \
     && echo '# Maven configuration' >> /root/.bashrc \
@@ -145,6 +143,8 @@ RUN echo '' >> /root/.bashrc \
 # 显示版本信息
 RUN echo "=== Environment Setup Complete ===" \
     && neofetch \
+    && echo "\nPython Version:" && python --version \
+    && echo "\nConda Version:" && conda --version \
     && echo "\nNode Version:" && . "$NVM_DIR/nvm.sh" && node --version \
     && echo "\nNPM Version:" && . "$NVM_DIR/nvm.sh" && npm --version \
     && echo "\nYarn Version:" && . "$NVM_DIR/nvm.sh" && yarn --version \