Why is the output of this code is like this

Question

When the user input hi why is the output is the excution of else statement not if import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String p = in.nextLine();
if(p == "hi"){
System.out.println("hi");
}else{
System.out.println("error");
}
}
}

Answer 1

== sign compare object not value.

Your answer is here

https://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java

Answer 2

You can't compare String with ==

To compare String use equals method like p.equals("hi")

Answer 3

Thank you

Answer 4

But what is happening when I use == sign can tell me