Thread: Arraylist error

Hello All!

I am working on a StringBuffer program and I am getting the following error message:

Cannot find symbol - method append(java.lang.String) with this part of the code selected:

return str1.append(str9);

I am not sure how to fix this. Any help would be greatly appreciated! I am posting the entire code below. Thank you!

import java.util.*;
import java.lang.StringBuffer;
class stringBuffProject
{
  static String append(String str1, String str2, String str3, String str4, String str5, String str6, String str7, String str8, String str9)
  {
        return str1.append(str9);
  }
    public static void main(String[] args) 
    {
      List<String> projectStringBuffers = new ArrayList<String>();
      projectStringBuffers.add("The ");
      projectStringBuffers.add("quick ");
      projectStringBuffers.add("brown ");
      projectStringBuffers.add("fox ");
      projectStringBuffers.add("jumped ");
      projectStringBuffers.add("over ");
      projectStringBuffers.add("the ");
      projectStringBuffers.add("lazy ");
      projectStringBuffers.add("dog.");
      System.out.println(projectStringBuffers.get(0).append(projectStringBuffers.get(1)).append(projectStringBuffers.get(2)).append(projectStringBuffers.get(3)).append(projectStringBuffers.get(4)).append(projectStringBuffers.get(5)).append(projectStringBuffers.get(6)).append(projectStringBuffers.get(7)).append(projectStringBuffers.get(8)));
    }
}