StringBuffer and StringBuilder

 Java StringBuffer class

 

Java StringBuffer class is used to create mutable (modifiable) string. The StringBuffer class in java is same as String class except it is mutable i.e. it can be changed .

Important methods of StringBuffer class

 

append(String s)	is used to append the specified string with this string.
insert(int offset, String s)	is used to insert the specified string with this string at the specified position.
replace(int startIndex, int endIndex, String str)	is used to replace the string from specified startIndex and endIndex.
delete(int startIndex, int endIndex)	is used to delete the string from specified startIndex and endIndex
reverse()	is used to reverse the string
charAt(int index)	is used to return the character at the specified position.
length()	is used to return the length of the string i.e. total number of characters.

Java StringBuilder class

 

Java StringBuilder class is used to create mutable (modifiable) string. The Java StringBuilder class is same as StringBuffer class except that it is non-synchronized.

Important methods of StringBuilder class

 

public StringBuilder append(String s)	is used to append the specified string with this string.
public StringBuilder insert(int offset, String s)	is used to insert the specified string with this string at the specified position..
public StringBuilder replace(int startIndex, int endIndex, String str)	is used to replace the string from specified startIndex and endIndex.
public StringBuilder delete(int startIndex, int endIndex)	is used to delete the string from specified startIndex and endIndex.
public StringBuilder reverse()	is used to reverse the string.
public char charAt(int index)	is used to return the character at the specified position.
public int length()	is used to return the length of the string i.e. total number of characters.