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String Buffer insert and append example
Posted on: June 11, 2007 at 12:00 AM

In this section, you will learn how to work with StringBuffer and append data to it.

String Buffer insert and append example

In this section, you will learn how to work with StringBuffer and append data to it. The StringBuffer is a class that implements multiple sequence of characters. The following program construct a string buffer that has '0' capacity. This program inserts the data in the string buffer using the insert() method that provides the facility for adding the data in any positions. But the append() method also add data in string buffer in ending position. This method inserts always last or end position.

Description of code:

StringBuffer(int len):
This is the constructor of StringBuffer class that implements multiple sequence of characters. This constructor constructs a string buffer that have no characters. It takes initial capacity that have to initialized.

insert(int pos, String str):
This method inserts the string into the object of StringBuffer. It takes following parameters:

pos: This is the position that have to be used for inserting the data.
str: This is the string that have to inserted.

append(String str):
This is the method that inserts the string into string buffer. It always inserts a string at last position.

Here is the code of program


import java.lang.*;



public class AppendInsert{

  public static void main(String[] args) {

  System.out.println("StringBuffer insert and append example!");

  StringBuffer sb = new StringBuffer(0);

  //First position

  System.out.println(sb.insert(0, "vinod"));

  int len = sb.length();

  //last position

  System.out.println(sb.insert(len, "Deepak"));

  //Six position

  System.out.println(sb.insert(6, "Raj"));

  //Always last

  System.out.println(sb.append("Mohit"));

  }

}

Download this example.

Output of program:

C:\vinod\Math_package>javac AppendInsert.java

C:\vinod\Math_package>java AppendInsert
StringBuffer insert and append example!
vinod
vinodDeepak
vinodDRajeepak
vinodDRajeepakMohit

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