arraylist items into string code example

Example 1: java arraylist to string

ArrayList al = new ArrayList();
      al.add("Hello");
      al.add("Wor");
      al.add("ld");
      StringBuffer sb = new StringBuffer();
      
      for (String s : al) {
         sb.append(s);
         sb.append(" ");
      }
      String str = sb.toString();
      System.out.println(str);//"Hello wor ld"

Example 2: arraylist string to string array

String[] arr = list.toArray(new String[list.size()]);

Example 3: arraylist items into string

String listString = String.join(", ", list); //Java 8 or later