#Compiling java cmd two classes one text code#
Let's start off with the simplest approach out of these three: Process process = Runtime.getRuntime().exec( "ping Running this code will execute the command we've supplied in String format. Let's write up a few examples to see how these overloaded methods differ from each other. It's up to you to decide whether exec("dir /folder") or exec(new String is what you'd like to use. A command is broken down into an array anyway, so using any of these two should yield the same results. What's also worth noting is the difference between String command and String cmdArray. It's worth noting that these processes are run externally from the interpreter and will be system-dependent. public Process exec(String cmdarray, String envp, File dir) - Executes a command, with the specified environment variables, from within the dir directory.public Process exec(String cmdArray, String envp) - Executes a command with the specified environment variables.public Process exec(String cmdArray) - Executes a command in the form of an array of Strings.public Process exec(String command, String envp, File dir) - Executes the command, with the specified environment variables, from within the dir directory.They're provided as an array of Strings, following the name=value format. public Process exec(String command, String envp) - Executes the command, with an array of environment variables.public Process exec(String command) - Executes the command contained in command in a separate process.The exec() method offers a few overloaded variations: Through it, the application itself communicates with the environment it's in.īy extracting the runtime associated with our application via the getRuntime() method, we can use the exec() method to execute commands directly or run. The Runtime class in Java is a high-level class, present in every single Java application. Using Java, we can run single or multiple shell commands, execute shell scripts, run the terminal/command prompt, set working directories and manipulate environment variables through core classes.
There's no need to run everything manually. This process is also ripe for automation.
System administrators run many commands all the time, some of which are very repetitive and require minimal changes in-between runs. We use computers to automate many things in our daily jobs. In this article, we'll take a look at how we can leverage the Runtime and ProcessBuilder classes to execute shell commands and scripts with Java.