method of buffer class

  

                  Method of string buffer class

StringBuffer class:

StringBuffer class lets the user to modify the characters present within the string while String class always returns the new String object containing the modified string and the original string remains unchanged .

The StringBuffer class reverses the 16 additional character spaces for further advancement in the string.

Constructors of the StringBuffer class:

a) StringBuffer(): It will create the blank string buffer class object.

b) StringBuffer(int length): This argument will set the length of the String .

E.g.

StringBuffer sb=new StringBuffer(5);

sb="computer";

System.out.println(sb);

Output:

compu

c) StringBuffer(String s ):

where: s is the string with which we want to initialize the StringBuffer class object.

E.g.

StringBuffer sb=new StringBuffer("hello");

System.out.println(sb);

Output:

hello

 

Methods of the StringBuffer class

1. length():  This method will return the length of the string , that is , the number of characters present in the string .

StringBuffer sb=new StringBuffer("Hello");

System.out.println(sb);

System.out.println(sb.length());

2. capacity():  This method returns the total allocated capacity to the StringBuffer class object i.e. the number of characters present in it plus the extra 16 characters.

StringBuffer sb=new StringBuffer("Hello");

System.out.println(sb);

System.out.println(sb.length());

System.out.println(sb.capacity());

Output:

Hello

5

21

3) setLength(): This method is used to set the length for the StringBuffer class object .

The general form is.

                                    void setLength(int length)

E.g.

StringBuffer sb=new StringBuffer("computer");

System.out.println(sb);

sb.setLength(5);

System.out.println(sb);

Output:

computer

compu