public class RuntimeExample {
    public static void main(String[] args) {
        // 获取当前运行时对象
        Runtime runtime = Runtime.getRuntime();

        try {
            // 执行外部命令
            Process process = runtime.exec("ls -l");

            // 等待进程结束，并获取返回值
            int exitCode = process.waitFor();
            System.out.println("Process exited with code: " + exitCode);

            // 获取系统的可用处理器数量
            int availableProcessors = runtime.availableProcessors();
            System.out.println("Available processors: " + availableProcessors);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}