1. The method first checks if s1==s2.  If it is then it return true. Recall this only be true if the string objects are interned. Else though the value of the objects are same == will always return false for String object
  2. If s1== s2 returns false then length of the both the String is checked if they are same
  3. If same then comparison is done on each character of both objects sequentially.
  4. Returns true if all characters are same.

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