CODEWITHSUNDEEP
java
Divyanshu
Divyanshu

Reputation: 51

How to wait for the cmd command to get executed before running the next command?

Need to wait for the cmd command to get executed before running the display function.

Need the Process p to get executed completely before executing display function.

String command1 = "cmd /c start cmd.exe /k \"" + processCommand1 + " && " + processCommand2  +" && "+ exitCommand+"\"";

Process p = Runtime.getRuntime().exec(command1);

display();

Upvotes: 5

Views: 269

Answers (3)

Gmugra
Gmugra

Reputation: 510

Better to use java.lang.ProcessBuilder. JavaDoc had example: https://docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html Something like that:

ProcessBuilder processBuilder = new ProcessBuilder("...");
...
Process process = processBuilder.start();
...
int exitCode = process.waitFor();

Upvotes: 1

Karol Dowbecki
Karol Dowbecki

Reputation: 44970

One way would be to use Process.waitFor(). However in your example you are using cmd /c start which will run the actual program asynchronously in the background. You should ensure that the program is started synchronously without start so you can wait for it.

Upvotes: 8

Christo Naudé
Christo Naudé

Reputation: 21

    Process p;
    try {
        p = Runtime.getRuntime().exec(command);

        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
            output.append(line + "\n");
            if (line.contains(exitConfirm)) {
                break;
            }
        }
        p.waitFor();
    } catch (Exception e) {
        e.printStackTrace();
    }


    display()

this code will either wait for a specific exit line or wait until the process is completed

Upvotes: -2

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