String buffer is a mutable string object. String is a non - mutable object. When we say mutable means which can be changed anytime. Its better to string buffer if we want to modify a string from multiple threads(Some places synchronization is required).

String buffer is a mutable string object. String is a non - mutable object. When we say mutable means which can be changed anytime. Its better to string buffer if we want to modify a string from multiple threads(Some places synchronization is required).

When a String is created it is not destroyed. It remains in the pool of memory and whenever that string is referred the JVM searches for the String from the string pool of memory and gets the relevant data. So as such String is expensive operation.

String buffer can be changed/modified based on our requirement. There are chances that you may need to form a query based on some conditions. Such queries can be formed using String buffer. Finally you can user the toString method to get the final String version of the stringBuffer.

Pls mail back if you are unclear with any of the items that I have specified in this solution.

Thanks & Regards

Sriram

I just read a discussion in the following article (about String vs Stringbuffer). It contridicts popular belief and so it is interesting.

http://thedailywtf.com/forums/41017/ShowPost.aspx

Hope that is informative/ interesting.

- justAnother

RE: What is the difference between String and StringBu...

String is immutable. If you want to update string value often (build query on condition) you should use StringBuffer.

for(int i 0;i<100;i++)

{

}

String is immutable. If you want to update string value often (build query on condition) you should use StringBuffer.

method(){

String abc ;

for(int i 0;i<100;i++)

{

abc abc + d ; // each time new string object is formed. very expensive

}}