StringBuffer class 3:

                                                  StringBuffer class 3:

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

8) insert(): This method is used to insert the character or the string at the particular position in the string . This method has the two different forms:

                                    insert(int index,int ch);

                                    insert(int index,String s);

StringBuffer sb=new StringBuffer("computer");

sb.insert(2,'a');

System.out.println(sb);

sb.insert(2,"today");

System.out.println(sb);

Output:

coamputer

cotodayamputer

9) reverse(): This method is used to reverse the string .

StringBuffer sb=new StringBuffer("comp");

System.out.println(sb);

sb.reverse();

System.out.println(sb);

Output:

                                    comp

                                    pmoc

10) delete(): This method is used to delete the specific group of characters from the string .

The general form is:

                                    delete(int sindex,int eindex)

            The characters are actually deleted till the position eindex-1

E.g.

StringBuffer sb=new StringBuffer("computer");

System.out.println(sb);

sb.delete(3,6);

System.out.println(sb);

Output:

computer

comer

11) deleteCharAt(): This method is used to delete the character at the particular index position .

The general form is:

                                    deleteCharAt(int index)

Where:

                                    index is the character position.

E.g.

StringBuffer sb=new StringBuffer("comp");

System.out.println(sb);

sb.deleteCharAt(2);

System.out.println(sb);

Output:

comp

cop