exec(cmd)跟exec(cmdarray)的区别

exec(cmd)和exec(cmdarray)的区别

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public Process exec(String command, String[] envp, File dir)        throws IOException {        if (command.length() == 0)            throw new IllegalArgumentException("Empty command");StringTokenizer st = new StringTokenizer(command);String[] cmdarray = new String[st.countTokens()]; for (int i = 0; st.hasMoreTokens(); i++)    cmdarray[i] = st.nextToken();return exec(cmdarray, envp, dir);    }