start a process in a cmd window and get output

Question

I want to start a process in a CMD window with Java, and the easiest way to do that is by

Runtime.getRuntime().exec("cmd /c start program.exe")

The problem is that now I can't get the input from the process. How can I get the output from the process and be able to run it in a separate CMD window?

Answer 1

Your problem is that start is a separate command whose purpose is to launch a completely new process unrelated to the cmd that invokes start . Whatever start then executes is not connected to the original cmd and cannot be accessed by your Java program.

If you need to access the subprocess' in/out/err streams, do not use start .

Answer 2

Hey bro if you want to println the output process of your process use this

Process process= Runtime.getRuntime().exec("cmd /c start program.exe");
BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));

String line = null;
while ((line = br.readLine()) != null) {
        line = br.readLine();
        System.out.println(line);
}

with this you will get each output process exactly the same with cmd output.

if you want to process 2 cmd maybe you can make 2 process with different exec

Process process1 = Runtime.getRuntime().exec("cmd /c start program1.exe");
Process process2 = Runtime.getRuntime().exec("cmd /c start program2.exe");

if you want this run with same thread please read java books about thread, you can run it at the same time with thread.