'equals()' and 'hashCode()' not paired
Reports classes that override the equals() method but do not override the hashCode() method or vice versa, which can potentially lead to problems when the class is added to a Collection or a HashMap.
The quick-fix generates the default implementation for an absent method.
Example:
class StringHolder {
String s;
@Override public int hashCode() {
return s != null ? s.hashCode() : 0;
}
}After the quick-fix is applied:
class StringHolder {
String s;
@Override public int hashCode() {
return s != null ? s.hashCode() : 0;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof StringHolder)) return false;
StringHolder holder = (StringHolder)o;
if (s != null ? !s.equals(holder.s) : holder.s != null) return false;
return true;
}
}- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
EqualsAndHashcode
Inspection Details | |
|---|---|
By default bundled with: | |
Can be installed with plugin: | Java, 243.23126 |