Is there a way to shutdown a computer using a built-in Java method?
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9 Answers
Create your own function to execute an OS command through the command line?
For the sake of an example. But know where and why you'd want to use this as others note.
public static void main(String arg[]) throws IOException{
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec("shutdown -s -t 0");
System.exit(0);
}
2 Comments
BRampersad
+1 nothing is more java than this line - Runtime runtime = Runtime.getRuntime();
Pang
First link in answer is outdated.
Here's another example that could work cross-platform:
public static void shutdown() throws RuntimeException, IOException {
String shutdownCommand;
String operatingSystem = System.getProperty("os.name");
if ("Linux".equals(operatingSystem) || "Mac OS X".equals(operatingSystem)) {
shutdownCommand = "shutdown -h now";
}
// This will work on any version of windows including version 11
else if (operatingSystem.contains("Windows")) {
shutdownCommand = "shutdown.exe -s -t 0";
}
else {
throw new RuntimeException("Unsupported operating system.");
}
Runtime.getRuntime().exec(shutdownCommand);
System.exit(0);
}
The specific shutdown commands may require different paths or administrative privileges.
Here is an example using Apache Commons Lang's SystemUtils:
public static boolean shutdown(int time) throws IOException {
String shutdownCommand = null, t = time == 0 ? "now" : String.valueOf(time);
if(SystemUtils.IS_OS_AIX)
shutdownCommand = "shutdown -Fh " + t;
else if(SystemUtils.IS_OS_FREE_BSD || SystemUtils.IS_OS_LINUX || SystemUtils.IS_OS_MAC|| SystemUtils.IS_OS_MAC_OSX || SystemUtils.IS_OS_NET_BSD || SystemUtils.IS_OS_OPEN_BSD || SystemUtils.IS_OS_UNIX)
shutdownCommand = "shutdown -h " + t;
else if(SystemUtils.IS_OS_HP_UX)
shutdownCommand = "shutdown -hy " + t;
else if(SystemUtils.IS_OS_IRIX)
shutdownCommand = "shutdown -y -g " + t;
else if(SystemUtils.IS_OS_SOLARIS || SystemUtils.IS_OS_SUN_OS)
shutdownCommand = "shutdown -y -i5 -g" + t;
else if(SystemUtils.IS_OS_WINDOWS)
shutdownCommand = "shutdown.exe /s /t " + t;
else
return false;
Runtime.getRuntime().exec(shutdownCommand);
return true;
}
This method takes into account a whole lot more operating systems than any of the above answers. It also looks a lot nicer and is more reliable then checking the os.name property.
Edit: Supports delay and all versions of Windows (inc. 8/10).
3 Comments
JFreeman
Thank you very much this is very useful! Do you know of any similar way to sleep a computer in every OS?
Kezz
@JFreeman Sorry for late reply, but for future people seeking this out, you could just change the commands to whatever the OS command for sleeping is. It now includes Windows 8+ support.
Luis U.
In the windows branch of the condition, you must multiply the t value * 60 as Windows shutdown is measured in seconds (vs minutes in the rest of the *nix OS).
The quick answer is no. The only way to do it is by invoking the OS-specific commands that will cause the computer to shutdown, assuming your application has the necessary privileges to do it. This is inherently non-portable, so you'd need either to know where your application will run or have different methods for different OSs and detect which one to use.
Comments
I use this program to shutdown the computer in X minutes.
public class Shutdown {
public static void main(String[] args) {
int minutes = Integer.valueOf(args[0]);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
ProcessBuilder processBuilder = new ProcessBuilder("shutdown",
"/s");
try {
processBuilder.start();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}, minutes * 60 * 1000);
System.out.println(" Shutting down in " + minutes + " minutes");
}
}
Comments
Better use .startsWith than use .equals ...
String osName = System.getProperty("os.name");
if (osName.startsWith("Win")) {
shutdownCommand = "shutdown.exe -s -t 0";
} else if (osName.startsWith("Linux") || osName.startsWith("Mac")) {
shutdownCommand = "shutdown -h now";
} else {
System.err.println("Shutdown unsupported operating system ...");
//closeApp();
}
work fine
Ra.
1 Comment
Bart van Heukelom
Until somebody uses a new OS called Macaroni where shutdown is the self-destruct command.
On Windows Embedded by default there is no shutdown command in cmd. In such case you need add this command manually or use function ExitWindowsEx from win32 (user32.lib) by using JNA (if you want more Java) or JNI (if easier for you will be to set priviliges in C code).
Comments
easy single line
Runtime.getRuntime().exec("shutdown -s -t 0");
but only work on windows