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Why is this an issue?
The purpose of the hashCode method is to return a hash code based on the contents of the object. Similarly, the purpose of the
toString method is to provide a textual representation of the object’s contents.
Calling hashCode() and toString() directly on array instances should be avoided because the default implementations
provided by the Object class do not provide meaningful results for arrays. hashCode() returns the array’s "identity hash
code", and toString() returns nearly the same value. Neither method’s output reflects the array’s contents.
How to fix it
Use relevant static Arrays method.
-
Arrays.hashCode or Arrays.deepHashCode
-
Arrays.toString or Arrays.deepToString
Code examples
Noncompliant code example
public static void main(String[] args) {
String argStr = args.toString(); // Noncompliant
int argHash = args.hashCode(); // Noncompliant
}
Compliant solution
public static void main(String[] args) {
String argStr = Arrays.toString(args); // Compliant
int argHash = Arrays.hashCode(args); // Compliant
}
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