java - How do you remove the first and the last characters from a Multimap's String representation? -

i trying output result of multimap.get() file. [ , ] characters appear first , last character respectively.

i tried use program, doesn't print separators between integers. how can solve problem?

package main;  import java.io.file; import java.io.filenotfoundexception; import java.io.printwriter; import java.io.unsupportedencodingexception; import java.util.arraylist; import java.util.collections; import java.util.list; import java.util.scanner;  import com.google.common.collect.arraylistmultimap; import com.google.common.collect.maps; import com.google.common.collect.multimap;  public class app {  public static void main(string[] args) {      file file = new file("test.txt");     arraylist<string> list = new arraylist<string>();     multimap<integer, string> newsortedmap = arraylistmultimap.create();      try {         scanner s = new scanner(file);         while (s.hasnext()) {             list.add(s.next());         }         s.close();     } catch (filenotfoundexception e) {         system.out.println("file cannot found in root folder");         ;     }      (string word : list) {         int key = findkey.convertkey(word);         newsortedmap.put(key, word);     }      // overwrites old output.txt     try {         printwriter writer = new printwriter("output.txt", "utf-8");         (integer key: newsortedmap.keyset()) {             writer.println(newsortedmap.get(key));         }         writer.close();      } catch (filenotfoundexception e) {         system.out.println("filenotfoundexception e should not occur");     } catch (unsupportedencodingexception e) {         system.out.println("unsupportedencodingexception has occured");     } } 

you may assign newsortedmap.get(key).tostring() variable, lets stringlist. call writer.println(stringlist.substring(1,stringlist.length()-1));

understand when pass list writer.println method, invoke tostring() method of object , write output. list.tostring() method returns string values separated , , adds [ , ] beginning , end of string.