public char next(char c) throws JSONException {
        char n = this.next();
        if (n != c) {
            throw this.syntaxError("Expected '" + c + "' and instead saw '" + n + "'");
        }
        return n;
    }
@author Robert HG (254963746@qq.com) on 12/28/15.
lts-core/src/main/java/com/github/ltsopensource/json/JSONTokenizer.java