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POJavaAdding List to TreeMap and Display out key and list
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  1. POJavaAdding List to TreeMap and Display out key and list
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    copied!<p>I have the following textfile contains the information that will be added to the treemap.</p> <pre><code>1 apple 1 orange 3 pear 3 pineapple 4 dragonfruit </code></pre> <p>my code:</p> <pre><code>public class Treemap { private List&lt;String&gt; fList = new ArrayList&lt;String&gt;(); private TreeMap&lt;Integer, List&lt;String&gt;&gt; tMap = new TreeMap&lt;Integer, List&lt;String&gt;&gt;(); 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 { in.close(); } } public void Add(int item, String fruit) { if (tMap.containsKey(item) == false) { tMap.put(item, fList); fList.add(fruit); System.out.println("Fruits added " + item); } else { System.out.println("not exist"); } } public void Display(int item) { if (tMap.containsKey(item)) { System.out.print("Number " + item + ":" + "\n"); System.out.print(fList); System.out.print("\n"); } else { System.out.print(item + " WAS NOT FOUND"+ "\n"); } } } </code></pre> <p>ideal output</p> <pre><code>Number 1: [apple, orange] Number 3: [pear, pineapple] Number 4: [dragonfruit] </code></pre> <p>currently i only able to output this</p> <pre><code>Fruits added 1 Number 1: [apple] not exist Number 1: [apple] Fruits added 3 Number 3: [apple, pear] not exist Number 3: [apple, pear] Fruits added 4 Number 4: [apple, pear, dragonfruit] </code></pre> <p>How should I display the item following by the list of fruit added to that number?</p>
 

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