method of string buffer 2.

                                                          method of string buffer 2.

4) charAt(int index):

This method is used to return the character present at the particular index position in the string

E.g.

StringBuffer sb=new StringBuffer("computer");

System.out.println(sb.charAt(3));

Output :

p

5) setCharAt(int index , int ch)

The method is used to set the character at a particular index position .

E.g.

StringBuffer sb=new StringBuffer("hello");

System.out.println(sb);

sb.setCharAt(1,'a');

System.out.println(sb);

Output:

hello

hallo

6) getChars():

This method is used to extract the specific group of characters from the string and assign it into the character array. The general form is:

getChars(int sindex,int eindex,char t[],int position)

Where:

                                    sindex is the starting index position .

eindex is the ending index position.Actually the string is extracted upto the position eindex-1.

                                    t is the target character array.

position is used to specify the index position from where the insertion will start in the target array

char t[]=new char[50];

StringBuffer  sb=StringBuffer("computer");

sb.getChars(3,6,t,0);

for(int i=0;i<sb.length();i++)

                                    System.out.print(t[i]);

7) append(): This method is used to append or add the character or the string at the end of the string . This method has two forms:

append(int ch)

append(String s)

E.g.

StringBuffer sb=new StringBuffer("Quantum");

StringBuffer s;

s=sb.append("adcom") ;

s= s.append(" is") ;

System.out.println(s);

Output:

Quantumadcom is