运行时通过崩溃进行webrtc视频通话

Question

我正在构建一个应用程序，并使用webrtc在该应用程序中进行视频聊天，我已经集成了它，但是我在后台遇到了以下崩溃

public static void main(String[] args) throws IOException {

    String target = "IWANTTHIS";

    //Four possible inputs
    String strLineText = "random string with IWANTTHISABC-123 and more";   //works
    String strLineText = "IWANTTHISCBC-45601 and more";                    //works
    String strLineText = "IWANTTHISEBC-1";                                 //doesn't work
    String strLineText = "random string with IWANTTHISKBC-55545";          //doesn't work

    //Method1
    System.out.println("O/P 1:" + strLineText.substring(strLineText.indexOf(target), 
            strLineText.indexOf(target) + strLineText.substring(strLineText.indexOf(target)).indexOf(" ") + 1).trim());

    //Method2
    for (String s : strLineText.split(" "))
        if (s.contains(target))
            System.out.println("O/P 2:" + s.trim());
}

任何人都可以帮忙吗？