How to check null on StringBuilder?

java, stringbuilder

Solution

No, `null` and `empty` are different for `StringBuilder`.

StringBuilder nullBuilder = null;
if(nullBuilder == null) {
    System.out.println("Builder is null");
}

&

StringBuilder emptyBuilder = new StringBuilder("");
if(emptyBuilder == null || emptyBuilder.toString().equals("")) {
    System.out.println("Builder is empty");
}

Problem

I want to check for null or empty specifically in my code. Does empty and null are same for `StringBuilder` in Java? For example: ``` StringBuilder state = new StringBuilder(); StringBuilder err= new StringBuilder(); success = executeCommand(cmd, state, err); /* here executeCommand() returns empty or null in state, I cant make changes in <br/> executeCommand() so can I check it in my code somehow for state, if its null or empty? */<br/> if (state == null) { //do blabla1 } if (state.tostring().equals("")) { //do blabla2 } ``` Does above code make sense or how should I change it?

Original source