Use of setCharAt() method in Java

// Program to explain the following StringBuffer function :
// void setCharAt( int where, char ch )
class  MsetCharAt1
{
public static void main( String args[ ] )
{
 StringBuffer sb1 = new StringBuffer( "Java Nrogramming Examples." );
 System.out.println( " String Before Replacing = " + sb1 );
 
 sb1.setCharAt( 5, 'P' );
 System.out.println( " String After Replacing  = " + sb1 );
}
}

Output:
String Before Replacing = Java Nrogramming Examples.
String After Replacing  = Java Programming Examples.