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In simple words, == checks if both objects point to the same memory location whereas . equals() evaluates to the comparison of values in the objects . If a class does not override the equals method, then by default, it uses the equals(Object o) method of the closest parent class that has overridden this method.23 Şub 2022

contains() is faster performance-wise than comparing the whole string with string. equals() or string == “blah blah”. I don’t know the inner workings of any of these methods, but logically, it seems like contains() should be faster because it can stop traversing the string after it finds the match.

Both, Contains and Equals are using string comparison. Since your Key is of type string, Contains will check if the passed parameter is part of the key, whereas Equals compares the complete string for equality .