How to retrieve data from nested hash-map in good view?

Question

I have a nested hash-map as

 HashMap<Integer, HashMap<String,Integer>> productAdded = new HashMap<>();

I added value as

    int price=12;
    String name="Apple";
    productAdded.put(1, new HashMap(){{ put(name, price); }});

and I am trying to retrieve it as

for(int i=1;i<=ProductList.productAdded.size();i++) 
{
    System.out.println(ProductList.productAdded.get(i).keySet()+"\t :$"+ProductList.productAdded.get(i).values());
}

Actual output

[Large Pizza] :$[12]

Expected output.

Large Pizza :$12

Answer 1

Use for each loop for iterating

for(Integer i :productAdded.keySet()) {
           for(String s: productAdded.get(i).keySet()) {
               System.out.println(s+"\t :$"+ProductList.productAdded.get(i).get(s));
           }
       }

You can also do this by using java 8 streams foreach

ProductList.productAdded.keySet().stream().forEach(item->{
             ProductList.productAdded.get(item).keySet().stream().forEach(inneritem->{
                 System.out.println(inneritem+"\t :$"+ProductList.productAdded.get(item).get(inneritem));
             });
     });

Answer 2

Both keySet() and values() return collections, hence the additional braces. For your particular case, refactor to keySet().iterator().next() and values().iterator().next to achieve the desired output format.

Answer 3

Although not recommended, you can do something like this:

ProductList.productAdded.get(i).keySet().toString().replace("[","").replace("]","");

Same for the values bit.

or you can do something like this:

String brackets = "[\\[\\]]";
ProductList.productAdded.get(i).keySet().toString().replaceAll(brackets,"");