Can someone explain why the below JAVA multi condition code don't provide the correct Output.

Question

Even if i provide a input Which satisfies the condition it still give a false result.

for eg: Input : US 25

Output : Not sure ( It should perform the if condition which it is not doing. I want to know why its not working.

for the same program if i use "equals" it is working. but not sure what is Wrong while using the == Operator.

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String country = sc.nextLine();
int age = sc.nextInt();
if ((country=="US"||country=="GB")&&(age>=18 && age<=100))
{
System.out.println("Country: "+ country );
System.out.println("Age :"+ age);

}else{
System.out.println("Not sure!!");
}

}
}

Working Code :

import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String country = sc.nextLine();
int age = sc.nextInt();
if ((country.equals("US")||country.equals("GB"))&&(age>=18 && age<=100))
{
System.out.println("Country: "+ country );
System.out.println("Age :"+ age);

}else{
System.out.println("Not sure!!");
}

}
}

Answer 1

It's to do with the way Java treats strings and objects.
Check this out:

https://www.sololearn.com/discuss/2123395/?ref=app
https://www.sololearn.com/discuss/113892/?ref=app
https://www.sololearn.com/discuss/95370/?ref=app
https://www.sololearn.com/discuss/2417339/?ref=app
https://www.sololearn.com/discuss/1725077/?ref=app

Answer 2

https://code.sololearn.com/cZms6c3vg2w3/?ref=app

Answer 3

This is because == is operator which match the address reference of object and equals is method which matches the string.. hope this will be helpful..