Java HashSet instead

A student class is written as follows:

Above is the direct use of the HashSet collection, the system will be the new Student () as the address does not come out, so the result is as follows:

Then I rewrote the hashcode () and Equals () methods in the Student class,

And then in the main program, create a new HashSet collection, and store the same properties, objects of different addresses

Then execute and get the result as follows:

To meet our needs. It will also be found that the most up-to-date HS collection, the stored elements will not be duplicated, because the Add () method in our HashSet automatically calls both methods of adding objects. The source code is realized.

Java HashSet instead