Complete the implementation of the static class method Strin

Complete the implementation of the (static) class method Stringll fndAndReplace(Stringll in, Stringll what, Stringllwith) of th class Utils. The method returns acopy of the arrayin where each word occurring in the array what has e been replaced by the word occurring at the corresponding position in the array with. The array designated by n must remain unchanged. Later in the semester, we will learn about exceptions. Exceptions provide tools forhandling error situations. In the meantime, the methodfindAndReplace returns null whenever one of the preconditions of the methods is violated: In particular, the formal parameters cannot be null. For all three arrays, none of the element can be nul The query and replacement arrays must be off thesame length.

Solution

Hi, Please find my implementation.

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public class Utils {

   public static String[] findAndReplace(String[] in, String[] what, String[] with){

       // base case : Precondition

       if(in == null || what == null || with == null)

           return null;

      

       if(what.length != with.length)

           return null;

       // creating a new String array of same length

       String[] out = new String[in.length];

       // traversing \'in\' array

       for(int i=0; i<in.length; i++){

           // current element of \'in\' array

           String str = in[i];

           // if current element of in is null then return null

           if(str == null)

               return null;

           // finding whether \'str\' is in \'what\' array or not

           int j = 0;

           while(j< what.length){

              

               // if current entry of with or what uis null then return null

               if(what[j] == null || with[j] == null)

                   return null;

               if(str.equals(what[j]))

                   break;

               j++;

           }

           // if \'str\' is in \'what\' array then replace \'str\' with corresponding value

           // of \'with\' array while storing in \'out\' array

           if(j != what.length)

               out[i] = with[j];

           else // did not find in what array

               out[i] = in[i];

       }

       return out;

   }

}