如何用Java关闭命令窗口

public class CloseCommandWindow {
    public static void main(String[] args) {
        try {
            Runtime.getRuntime().exec("taskkill /IM cmd.exe /F");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class CloseCommandWindow {
    public static void main(String[] args) {
        System.exit(0);
    }
}