What is the difference between null and an empty string…

In Java, null indicates that an object reference does not exist, meaning the object has not been instantiated. On the other hand, an empty string “” signifies that a string object has been instantiated, but its value is empty, meaning it does not contain any characters.

The differences are as follows:

1. null is used to indicate a non-existent object reference, while an empty string is a string object that has been instantiated.
2. For empty strings, you can perform operations using string methods such as obtaining length, concatenation, etc., whereas for null, operations cannot be performed.
3. When working with strings, null and empty strings are typically treated as two distinct cases, so it is important to differentiate between them in programming.