Explain about StringBuffer class ?

StringBuffer class is final class.
StringBuffer class is direct chaild class of Object class.
StringBuffer class implements Serializable, CharSequence.
StringBuffer class is mutable.
StringBuffer class is thread-safe.
StringBuffer class methods are synchronized.
StringBuffer class introduced in JDK1.0

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Difference between StringBuffer & StringBuilder

StringBuffer:

1. Every method present in StringBuffer is Synchronized

2. At a time only one thread can operate on StringBuffer object. Hence StringBuffer is thread safe

3. Relatively performance is low

4. Introduced in 1.0v

StringBuilder:

1. No method present in StringBuilder is Synchronized

2. Multiple threads can operate on StringBuilder object. Hence StringBuilder is not thread safe

3. Relatively performance is high

4. Introduced in 1.5v

Difference between StringBuilder & StringBuffer?

StringBuilder

 1.No method is synchronized

 2.StringBuilder is not thread safe

 3.Performance is high

 4.Available only in 1.5 version

 StringBuffer

1.All methods are Synchronized

2.StringBuffer is thread safe

3.Performance is very low

4.Available from 1.0 version