why the output is like this?

Question

public class rev {
public static void main (String[] args){
String s1 = "hello";
String s2 = "hel" + "lo";
String s3 = " mum";
if(s1==s2){
System.out.println("1.same");
}else{
System.out.println("1.different");
}

if(s1 + s3 == "hello mum"){
System.out.println("2.same");
}
else{
System.out.print("2.different");
}

}
}

#output:
1.same
2.different

Answer 1

https://www.sololearn.com/Discuss/647021/?ref=app

Answer 2

For comparing Strings, you should use .equals instead of ==.