Naming a method hashcode() or equal is either:

• A bug. Overriding Object.hashCode() or Object.equals was meant and the application does not behave as expected.
• Done on purpose. The name however will confuse every other developer, who will think it is a bug.

In both cases, the method should be renamed.

Noncompliant Code Example

public int hashcode() { /* ... */ }  // Noncompliant

public boolean equal(Object obj) { /* ... */ }  // Noncompliant

Compliant Solution

@Override
public int hashCode() { /* ... */ }

public boolean equals(Object obj) { /* ... */ }