我正在尝试编写一个从命令提示符下编译另一个Java文件的程序。我对此有疑问。至此，它已成功执行了第一部分，该部分将编译Mocha.java。但是，我希望它也执行该文件并显示其输出。它什么也不显示。有什么建议？

    pb = new ProcessBuilder("javac","Mocha.java");
    try {
        Process shell = pb.start();
        OutputStream shellOut = shell.getOutputStream();
        shellOut.write("java Mocha".getBytes());
        shellOut.close();
        InputStream shellIn = shell.getInputStream();
        String response = IOUtils.toString(shellIn, "UTF-8");
        System.out.println(response);
        shellIn.close();
        shell.destroy();
    } catch (IOException ex) {
        System.out.println("failed");
    }

注意：

我还尝试将所有参数初始化为：

pb = new ProcessBuilder("javac","Mocha.java","&&","java","Mocha");

但是，这不仅没有用，而且甚至没有像上面那样编译Mocha.java。

谢谢！

编辑：

因此，我将其更改为两个过程。现在工作棒！对于任何有兴趣的人：

    pb = new ProcessBuilder("javac","Mocha.java");
    try {
        Process shell = pb.start();
        int error = shell.waitFor();
        shell.destroy();
        if (error == 0)
        {
            pb = new ProcessBuilder("java","Mocha");
            shell = pb.start();
            InputStream shellIn = shell.getInputStream();
            String response = IOUtils.toString(shellIn, "UTF-8");
            System.out.println(response);
            shellIn.close();
            shell.destroy();
        }
    } catch (IOException ex) {
        System.out.println("failed");
    } catch (InterruptedException ex) {
    }