write a program to enter a string,a position where you want to change a character and a character now replace it with given position.

class ReplaceStringCharactor

{

 public static void main(String args[])

 {

  String str="apple";

  char oldchar='p';

  char newchar='b';

  int len=str.length();

  char[] a=new char[len];

  str.getChars(0, len, a, 0);

  System.out.println("string before replace   :"+str);

  int i=0;

  while(i<len)

  {

    if(a[i]==oldchar)

     {

      a[i]=newchar;

     }

   i++;

  }

 System.out.print("String after replace    :");

 String newstr=new String(a);

 System.out.println(newstr);

 }

}