Explain how it's output is falsefalsefalsetrue

Question

class String1 {
public static void main(String[] arg) {
StringBuffer sb1 = new StringBuffer("Hello");
StringBuffer sb2 = new StringBuffer("Hello");
String s1 = new String("Hello");
String s2 = new String("Hello");
System.out.print(sb1.equals(sb2));
System.out.print(s1 == s2);
System.out.print(sb1 == sb2);
System.out.print(s1.equals(s2));
}
}

Answer 1

Check this code to understand

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

Answer 2

Here comes the explanation.
https://www.geeksforgeeks.org/difference-between-and-equals-method-in-java/