Look the doc for the equals() method of ArrayList Returns true if and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal. Since there are no elements, all the conditions satisfied and hence true. If you add elements to the both list (atleast … Read more
The equals() and hashCode() methods prove to be very important, when objects implementing these two methods are added to collections. If implemented incorrectly it might screwed up your life. equals() : This method checks if some other object passed to it as an argument is equal the object in which this method is invoked. It is easy to implement the … Read more
I don’t know what do you mean by “not equal” (does not unify?), but you could try these:
As further comment, you should be aware of this term in the equals contract: From Object.equals(Object): For any non-null reference value x, x.equals(null) should return false. The way to compare with null is to use x == null and x != null. Moreover, x.field and x.method() throws NullPointerException if x == null.
Output: run: — Subash Adhikari – VS – K false — Subash Adhikari – VS – StackOverflow false — Subash Adhikari – VS – Subash Adhikari true — K – VS – StackOverflow false — K – VS – Subash Adhikari false — StackOverflow – VS – Subash Adhikari false — BUILD SUCCESSFUL (total time: … Read more