Replace Character Program in java

Question:

String – Replace Characters 

Write a recursive function ‘public static String replace(String str,char from,char to) ‘ that changes all occurrences of ‘from’ in ‘str’ to ‘to’.

For example, if str were “codebook”, and from = ‘o’ and to = ‘e’, then, str would become “cedebeek”.

Function Definitions:

Problem Requirements:

Note: Create the main() inside the class ‘ReplaceDriver’

Refer sample input and output for formatting specifications.

Sample Input and Output :

Enter the string

Asia

Enter the character to be replaced

a

Enter the character to be replaced with

i

The modified string is Asii

CODE:–

ReplaceDriver.java

import java.util.Scanner;
public class ReplaceDriver{
   public static String replace(String str, char c1, char c2){
       if(str.length()<1){
           return str;
       }
       else{
           char first=c1==str.charAt(0)? c2 :str.charAt(0);
           return first+ replace(str.substring(1),c1,c2);
       }
   }
public static void main(String[] args)
	{
    Scanner r= new Scanner(System.in);
    String str= new String();
    System.out.println("Enter the string");
    str=r.nextLine();
    System.out.println("Enter the character to be replaced");
    char c1= r.next().charAt(0);
    System.out.println("Enter the character to be replaced with");
    char c2=r.next().charAt(0);
    System.out.print("The modified string is "+ replace(str,c1,c2));
  }
}

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