Don't reassign a catch variable

문서 > 코드 분석 > Static Analysis Rules > Don't reassign a catch variable

이 페이지는 아직 한국어로 제공되지 않으며 번역 작업 중입니다. 번역에 관한 질문이나 의견이 있으시면 언제든지 저희에게 연락해 주십시오.

Metadata

ID: java-best-practices/avoid-reassigning-catch-vars

Language: Java

Severity: Notice

Category: Best Practices

Description

Maintaining a consistent link between the caught variable and the exception thrown in the corresponding try block brings clarity and predictability. Reassigning the caught variable disrupts this expectation and can lead to confusion. By refraining from these reassignments, developers can know that the variable encapsulates the essence of the original exception.

Non-Compliant Code Examples

public class Foo {
    public void foo() {
        try {
            // do something
        } catch (Exception e) {
            e = new NullPointerException(); // should not reassign here
        }
    }
}

Compliant Code Examples

public class Foo {
    public void foo() {
        try {
            // do something
        } catch (MyException e) {
            newError = new RuntimeException(); // created a new error variable
        }
    }
}