在 Java 中查询系统（非 JVM）正常运行时间

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class SystemUptime {
    public static void main(String[] args) throws Exception {
        Process process = Runtime.getRuntime().exec("uptime");
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line = reader.readLine();
        String[] parts = line.split(" ");
        int index = 0;
        for (int i = 0; i< parts.length; i++) {
            if (parts[i].equals("up")) {
                index = i + 1;
                break;
            }
        }
        String uptime = parts[index];
        System.out.println("System uptime: " + uptime);
    }
}