Write a method manyStrings that takes an ArrayList of Strings and an integer n a

Question

Write a method manyStrings that takes an ArrayList of Strings and an integer n as parameters and that replaces every String in the original list with n of that String.  For example, suppose that an ArrayList called "list" contains the following values:

("squid", "octopus")

And you make the following call:

manyStrings(list, 2);

Then list should store the following values after the call:

("squid", "squid", "octopus", "octopus")

As another example, suppose that list contains the following:

("a", "a", "b", "c")

and you make the following call:

manyStrings(list, 3);

Then list should store the following values after the call:

("a", "a", "a", "a", "a", "a", "b", "b", "b", "c", "c", "c")

You may assume that the ArrayList you are passed contains only Strings and that the integer n is greater than 0.

Explanation / Answer

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import java.util.*;
public class main
{public static void main(String []args)
   {ArrayList<String> thing1 = new ArrayList<String>();
   ArrayList<String> thing2 = new ArrayList<String>();
   thing1.add("squid");
   thing1.add("octopus");
   thing2.add("a");
   thing2.add("a");
   thing2.add("b");
   thing2.add("c");
   System.out.println("before call : "+thing1);
   manyStrings(thing1,2);
   System.out.println("after call : "+thing1);
   System.out.println("before call : "+thing2);
   manyStrings(thing2,3);
   System.out.println("call call : "+thing2);
     }
   public static void manyStrings(ArrayList<String>list,int n)
   {int i,j,index,len;
   String value;
   len=list.size();
   for(i=0;i<len;i++)
       {index=i*n;
       value=list.get(index);
       for(j=0;j<n-1;j++)
          list.add(index+j+1,value);
       }
   }
    }

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