Selecting random key and value sets from a Map in Java

Question

I want to get random keys and their respective values from a Map. The idea is that a random generator would pick a key and display that value. The tricky part is that both k

Answer 1

In some cases you might want to preserve an order you put the elements in the Set,
In such scenario you can use, This 

Set alldocsId = new HashSet<>();
            for (int i=0;i alldocIDlst = new ArrayList<>();
        Iterator it = alldocsId.iterator();
        while (it.hasNext())
        {
            alldocIDlst.add(Integer.valueOf(it.next().toString()));
        }