How to run an external program and get the return value

RunExternalProgram.java

//Execute external program and get the return value

// Params have to be stored inside a string array
String[] params = {"cmd.exe", "/c", "dir"};
Process process = Runtime.getRuntime().exec(params);
// Don't forget to close all streams!
process.getErrorStream().close();
process.getInputStream().close();
process.getOutputStream().close();
    
return process.waitFor();	//wait for the return value