publicclass JAVA_061
 {
    publicstaticvoid main(String[] args)
    {
       StringBuffer SB=new StringBuffer("Many hands make light work");

       System.out.println("At Start, StringBuffer : " + SB);

       SB.setCharAt(4,'%');
       SB.setCharAt(10,'%');
       SB.setCharAt(15,'%');
       SB.setCharAt(21,'%');

       System.out.println("After Changing, StringBuffer : " + SB);

       SB.reverse( );

       System.out.println("After Reversing, StringBuffer : " + SB);
    }
 }