How to generate the output for a given java collection object

Hi ,
 
Following is my java object 'itemMap'.And i want to generate the output as given below
 
Map<Integer, Set<String>> itemMap = newHashMap<Integer, Set<String>>();//id 1Integer i1 = 
Set<String> itemSet1 = 
itemSet1.add(
itemMap.put(i1, itemSet1);newInteger(1);newHashSet<String>();"A");//id 2Integer i2 = 
Set<String> itemSet2 = 
itemSet2.add(
itemSet2.add(
itemMap.put(i2, itemSet2);newInteger(2);newHashSet<String>();"B");"C");//id 3Integer i3 = 
Set<String> itemSet3 = 
itemSet3.add(
itemSet3.add(
itemMap.put(i3, itemSet3);
System.
 
Expected output:
 
1 A
2 B C
3 D E
 
Could anyone let me know how can i generate this using freemarker template?
 
Thanks,
RajvindernewInteger(3);newHashSet<String>();"D");"E");out.println(itemMap);

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