关于ParameterElement的parameterKind废弃替代方案及代码改写咨询

Great question—this is a tricky deprecation since the notice doesn’t explicitly spell out the replacement. Let’s break this down clearly for you:

1. What replaces parameterKind? #

The deprecated parameterKind enum was used to distinguish between required parameters (no default value) and optional parameters (with a default value). Its replacement comes in the form of two dedicated methods on ParameterElement:

• hasDefaultValue(): Returns true if the parameter has a default value (previously mapped to ParameterKind.OPTIONAL).
• isVarArgs(): Directly checks if the parameter is a variable-length argument (a case that was once covered by a separate ParameterKind value).

For other edge cases you might have handled with parameterKind (like final parameters), you can now check modifiers directly using getModifiers().contains(Modifier.FINAL).

2. How to rewrite arg.parameterKind == ParameterKind.REQUIRED? #

Since ParameterKind.REQUIRED refers to parameters without a default value, you can replace that line with a straightforward negation of the hasDefaultValue() check:

!arg.hasDefaultValue()

Quick Example #

If your original code looked like this:

if (arg.parameterKind == ParameterKind.REQUIRED) {
    // Logic for required parameters
}

Rewrite it to:

if (!arg.hasDefaultValue()) {
    // Logic for required parameters
}

内容的提问来源于stack exchange，提问作者Alex L.