Throwing Exceptions

Is this a totally valid / proper way of handling exceptions? For whatever reason I feel like this is improper

private String appendParametersToUrl(String url, String parameter, String string) throws IllegalArgumentException {
    if (StringUtils.isBlank(parameter) || StringUtils.isBlank(string)) {
      throw new IllegalArgumentException("Parameter or String arugments cannot be null.");
    }
    
    return ...;
}

private String appendParametersToUrl(String url, String parameter, String string) throws IllegalArgumentException {
    if (StringUtils.isBlank(parameter) || StringUtils.isBlank(string)) {
      throw new IllegalArgumentException("Parameter or String arugments cannot be null.");
    }
    
    return ...;
}

2 Replies

reddogg476•4mo ago

Not fully, no. You're missing a catch block. Exceptions should be handled within the code or the application will fail. This is achieved with a try-catch block (in Javascript, C# and others). Some programming languages can handle thrown exception, but it is not good practice.

try {
if (StringUtils.isBlank(param) || StringUtils.isBlank(string) {
  throw new IllegalArgumentException("Parameter or String arguments cannot be null.);
}
//function logic
}
catch (IllegalArgumentException except){
  log(except.message)
}

try {
if (StringUtils.isBlank(param) || StringUtils.isBlank(string) {
  throw new IllegalArgumentException("Parameter or String arguments cannot be null.);
}
//function logic
}
catch (IllegalArgumentException except){
  log(except.message)
}

When you throw an exception, it is caught by the next catch block. If there's no catch block to catch the illegal argument - and the exception is terminating, -the program will terminate unexpectedly. Look at heading #5 in this blog. There may be multiple exceptions need caught: https://dzone.com/articles/9-best-practices-to-handle-exceptions-in-java

vince•4mo ago

ty!!

Gaming

Programming

Throwing Exceptions