Java Tutorials

String Buffer

java.lang.StringBuffer

StringBuffer is another class present in Java which allows us to manipulate strings.This class is just like the String class except the fact that the strings created by this class are mutable.It is also thread-safe which means multiple threads cannot operate on the string. 

The StringBuffer class implements:

i)Serializable interface

ii)Appendable interface

iii)CharSequence interface

Constructors of StringBuffer class

Constructors	Description
StringBuffer()	Constructs a string buffer with no characters in it and an initial capacity of 16 characters.
StringBuffer(CharSequence seq)	Constructs a string buffer that contains the same characters as the specified CharSequence.
StringBuffer(int capacity)	Constructs a string buffer with no characters in it and the specified initial capacity.
StringBuffer(String str)	Constructs a string buffer initialized to the contents of the specified string.

Methods of StringBuffer class

Modifiers and type	Methods	Description
public int	capacity()	is used to return the current capacity.
public void	ensureCapacity(int minimumCapacity)	is used to ensure the capacity at least equal to the given minimum.
public char	charAt(int index)	is used to return the character at the specified position.
public synchronized StringBuffer	delete(int startIndex, int endIndex)	is used to delete the string from specified startIndex and endIndex.