Check if StringBuffer is empty

Question

Can anyone please tell me how I can use if-else condition with StringBuffer to check if it is empty?

I am expecting something like this

if (Stringbuffer is empty){ 
    // some condition 
}
else {
   // some other condition
}

Answer 1

StringBuffer.length():

[returns] the length of the sequence of characters currently represented by this object

so you can use the fact that StringBuffer.length() returns zero (or not) to check if the buffer is empty (or not).

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Note that you should probably be using StringBuilder instead of StringBuffer. From the Javadoc of StringBuffer:

As of release JDK 5, this class has been supplemented with an equivalent class designed for use by a single thread, StringBuilder. The StringBuilder class should generally be used in preference to this one, as it supports all of the same operations but it is faster, as it performs no synchronization.

Answer 2

StringBuffer buffer = null;

if(buffer == null || buffer.length() == 0){
     // some condition 
}else{
     // some other condition 
}