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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) { /* ... */ }