When we use double equal operator "==" for comparing two objects it will compare their addresses or hascodes generated by JVM?

Answer 1

https://www.sololearn.com/post/171078/?ref=app

Answer 2

Hello Sparsh Kathpal

You are right. == for objects compares their address.

You can use == only for primitive datatypes (int, double, char...)
For objects you have to use equals.

For example:

String s1 = "hello";
String s2 = "world";

s1.equals(s2) returns false.

Answer 3

Hello Denise Roßberg

As you are saying it will check the addresses of the objects but i have also one one doubt that in java there is no way to check what is the address of that object so how == check address. May be it is checking the hashcodes if hashcodes are equal than it will return true otherwise false. But i am not sure which is right it will check addresses or hascodes?

Answer 4

As far as I know == compares only the address. The JVM does this:

https://stackoverflow.com/questions/1382026/how-is-the-operator-implemented-in-java#:~:text=The%20%3D%3D%20operator%20just%20compares,just%20a%20standard%20object%20pointer.&text=When%20you%20compare%20two%20object,are%20a%20location%20in%20memory.

The hash code is connected with equals(). Means two objects which are equal should have the same hash code. That's important when you override equals() and hashCode().
But I think you need hash codes for hashsets and hashmaps.