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copied!<p>Try this code. Its working. By the way you should improve this code. The code is not optimised.</p> <pre><code>import java.io.BufferedReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.List; import java.util.TreeMap; public class Treemap { private List<String> fList = new ArrayList<String>(); private TreeMap<Integer, List<String>> tMap = new TreeMap<Integer, List<String>>(); public static void main(String[] args) { Treemap tm = new Treemap(); String file = ""; if (args.length == 1) { file = args[0]; try { tm.Read(file); } catch (IOException ex) { System.out.println("Error"); } } else { System.out.println("Usage: java treemap 'Filename'"); System.exit(1); } } public void Read(String file) throws IOException { //Scanner in = null; BufferedReader in = null; InputStream fis; try { fis = new FileInputStream(file); in = new BufferedReader(new InputStreamReader(fis)); String line = null; while ((line = in.readLine()) != null) { String[] file_Array = line.split(" ", 2); if (file_Array[0].equalsIgnoreCase("1")) { Add(Integer.parseInt(file_Array[0]), file_Array[1]); // Display(1); } else if (file_Array[0].equalsIgnoreCase("3")) { Add(Integer.parseInt(file_Array[0]), file_Array[1]); // Display(3); } else if (file_Array[0].equalsIgnoreCase("4")) { Add(Integer.parseInt(file_Array[0]), file_Array[1]); // Display(4); } } } catch (IOException ex) { System.out.println("Input file " + file + " not found"); System.exit(1); } finally { for(int i: tMap.keySet()) Display(i); in.close(); } } public void Add(int item, String fruit) { if (tMap.containsKey(item) == false) { fList = new ArrayList<>(); fList.add(fruit); tMap.put(item, fList); // System.out.println("Fruits added " + item); } else { tMap.get(item).add(fruit); // System.out.println("not exist"); } } public void Display(int item) { if (tMap.containsKey(item)) { System.out.print("Number " + item + ":" + "\n"); System.out.print(tMap.get(item)); System.out.print("\n"); } else { System.out.print(item + " WAS NOT FOUND"+ "\n"); } } </code></pre> <p>}</p>

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