Question

Given the nested collection that maps each term to a set of strings  

Return a string of terms that are repeated in all the nested sets

Given :

{apple=[apple BALL carrot, ball !carrot! ,!Dog*&]}

{apple=[apple BALL carrot, ball !carrot! ,!Dog*&], dog=[ball !carrot! ,!Dog*&]}

Return:

[ball !carrot! ,!Dog*&]

Public static String common(Map<String, Set<Sting>> map)

{

}

Answer 1

Ans)

Java program

import java.util.*;

class CommonInSet {

    public static void main(String[] args) {
        
        Set<String> s1 = new HashSet<String>();
        s1.add("apple BALL carrot");
        s1.add("ball !carrot!");
        s1.add("!Dog*&");
        System.out.println("Set 1: " + s1);

        Set<String> s2 = new HashSet<String>();
        s2.add("ball !carrot!");
        s2.add("!Dog*&");
        System.out.println("Set 1: " + s2);

        Map<String, Set<String>> m = new HashMap<String, Set<String>>();
        m.put("apple", s1);
        m.put("dog", s2);
        System.out.println("Map: " + m);

        System.out.println("Finding the common elements: ");
        Set<String> intersectionSet = new HashSet<String>();
        intersectionSet = common(m);
        System.out.println("Common Elements: " + intersectionSet);
    }

    public static Set<String> common(Map<String, Set<String>> map) {
        if (map == null)
            return null;

        Set set = map.entrySet();
        Iterator itr = set.iterator();
        Map.Entry entry = (Map.Entry) itr.next();
        Set<String> intersectionSet = new HashSet<String>();
        intersectionSet = (Set) entry.getValue();

        while (itr.hasNext()) {
            entry = (Map.Entry) itr.next();
            intersectionSet.retainAll((Set) entry.getValue());
        }

        return intersectionSet;
    }
}

Above compile and execute Java program and get output below screen shot here

Output

******************End*****"*****"**************

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