Calls of the form x.equals(y), where x and y have incomparable types, should always return false because the runtime types of x and y will be different. Two types are incomparable if they are distinct and do not have a common subtype.

Ensure that such comparisons use comparable types.

In the following example, the call to equals on line 5 refers to the whole array by mistake, instead of a specific element. Therefore, "Value not found" is returned.

Java API Documentation: Object.equals().