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How to execute an external program like windows media player in Java?
Using the Runtime class
Java provides a class named java.lang.Runtime, using this class you can interface with the current environment.
The getRunTime() (static) method of this class returns a Runtime object associated with the current application.
The exec() method accepts a String value representing the command to execute a process in the current environment (system) and executes it.
Therefore, to execute an external application using the Runtime class −
Get the run time object using the getRuntime() method.
Execute the required process by passing the path of it as a String value to the exec() method.
Example
import java.io.IOException;
public class Trail {
public static void main(String args[]) throws IOException {
Runtime run = Runtime.getRuntime();
System.out.println("Executing the external program . . . . . . . .");
String file = "C:\Program Files\Windows Media Player\wmplayer.exe";
run.exec(file);
}
}Output
System.out.println("Executing the external program . . . . . . . .Using the ProcessBuilder class
Similarly, the constructor of the ProcessBuilder class accepts a variable arguments of type string representing the command to execute a process and its arguments as parameters and constructs an object.
The start() method of this class starts/executes the process(es) in the current ProcessBuilder. Therefore, to run an external program using the ProcessBuilder class −
Instantiate the ProcessBuilder class by passing the command to execute a process and arguments for it as parameters to its constructor.
Execute the process by invoking the start() method on the above created object.
Example
import java.io.IOException;
public class ExternalProcess {
public static void main(String args[]) throws IOException {
String command = "C:\Program Files\Windows Media Player\wmplayer.exe";
String arg = "D:\sample.mp3";
//Building a process
ProcessBuilder builder = new ProcessBuilder(command, arg);
System.out.println("Executing the external program . . . . . . . .");
//Starting the process
builder.start();
}
}Output
Executing the external program . . . . . . . .
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