throwerror in angular 8 code example

Example 1: java 8 printstacktrace in system.out

public static void main(String[] args){
    try {
        test();
    } catch (UnsupportedOperationException e) {
        System.out.println(e);
        e.printStackTrace();
    }
}

private static void test() {
    throw new UnsupportedOperationException("Not yet implemented");
}

Example 2: interceptor in angular 8

interface HttpInterceptor {
  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>
}