if ! command -v java &> /dev/null; then

return 1

fi

local version_str

version_str=$(java -version 2>&1 | head -n 1 | cut -d '"' -f 2)

local major_version

major_version=$(echo "$version_str" | cut -d '.' -f 1)

if [ "$major_version" -ge "$REQUIRED_MAJOR" ]; then

echo "Found Java version $version_str (Matches requirement JDK $REQUIRED_MAJOR+)."

return 0

else

echo "Found older Java version: $version_str."

return 1

fi

echo "Downloading and installing JDK 25..."

# Detect Architecture

local arch

arch=$(uname -m)

if [ "$arch" = "x86_64" ]; then

local url="https://oracle.com"

elif [ "$arch" = "aarch64" ]; then

local url="https://oracle.com"

else

echo "Unsupported architecture: $arch" >&2

exit 1

fi

# Download and extract

sudo mkdir -p "$INSTALL_DIR"

curl -sSL "$url" | sudo tar -xzf - -C "$INSTALL_DIR" --strip-components=1

# Update system alternatives

sudo update-alternatives --install /usr/bin/java java "$INSTALL_DIR/bin/java" 2000

sudo update-alternatives --install /usr/bin/javac javac "$INSTALL_DIR/bin/javac" 2000

sudo update-alternatives --set java "$INSTALL_DIR/bin/java"

sudo update-alternatives --set javac "$INSTALL_DIR/bin/javac"

echo "JDK 25 installed and activated successfully."