How Can I Execute Command Lines from Within a Java Application?

Executing Command Lines from Java

In certain scenarios, it becomes necessary to execute external commands from within a Java application. This can be achieved through the Runtime class, which provides a method for running system commands.

For instance, consider the task of executing the following command line from a Java program:

java -jar map.jar time.rel test.txt debug

While you can manually execute this command from the terminal, let's explore how to do it from within Java.

To execute this command, we can use the Runtime.exec() method as follows:

Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("java -jar map.jar time.rel test.txt debug");

The Runtime.getRuntime() method returns an instance of the Runtime class, which represents the execution environment of the current Java application. The exec() method takes a command string as its argument and executes it as a separate process. The returned Process object represents the newly created process.

By using the Runtime.exec() method, you can run any command line command from your Java code, allowing you to interact with external resources and perform various operations. For more information about the Runtime class and the exec() method, refer to the Java documentation at http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html.

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