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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class Ideone {
  8.     public static void main(String[] args) {
  9.  
  10.         // create an empty array list with an initial capacity
  11.         ReorderingList rlist = new ReorderingList();
  12.  
  13.         // use add() method to add elements in the list
  14.         rlist.add("bob");
  15.         rlist.add("pat");
  16.         rlist.add("tan");
  17.         rlist.add("bob");
  18.         rlist.add("mat");
  19.         rlist.add("cat");
  20.         rlist.add("dog");
  21.         rlist.add("cat");
  22.  
  23. 		List<String> arrlist = rlist.asList();
  24.  
  25.         // let us print all the elements available in list
  26.         for (String number : arrlist) {
  27.             System.out.println("String = " + number);
  28.         } 
  29.  
  30.         // retrieves element at 4th postion
  31.         String retval=arrlist.get(3);
  32.         System.out.println("Retrieved element is = " + retval); 
  33.     }
  34.  
  35.     public static class ReorderingList {
  36.     	private LinkedHashMap<String, Integer> items =
  37.     	    new LinkedHashMap<String, Integer>();
  38.  
  39.     	public void add(String item) {
  40.     		Integer value = items.get(item);
  41.     		if (value == null) value = 0;
  42.     		value++;
  43.     		items.put(item, value);
  44.     	}
  45.  
  46.     	public List<String> asList() {
  47.     		List<String> result = new ArrayList<String>();
  48.     		for(Map.Entry<String, Integer> entry : items.entrySet()) {
  49.     			for (int i=0; i < entry.getValue(); i++) {
  50.     				result.add(entry.getKey());
  51.     			}
  52.     		}
  53.     		return result;
  54.     	}
  55.     }
  56. }
Success #stdin #stdout 0.08s 380160KB
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stdin
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Standard input is empty
stdout
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String = bob
String = bob
String = pat
String = tan
String = mat
String = cat
String = cat
String = dog
Retrieved element is = tan
https://ideone.com/mMmx4H
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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