Question

I need help with a Java question...

A)

Create the tree map that should store following strings.

Hello

Today

Is

Monday

Once you stored all the data in the tree map, then loop thru the tree map and remove things

B)

Then, Create a set that stores the folling strings.

-This
-Class
-is
-good
-We
-have
-learned
-lot
-of
-things.

Once you stored all the data in the set/map, then loop thru the set using iterator and remove all the strings that starts with either C or o.
And print the entire set as the single statement.

Answer 1

// TEXT CODE

import java.util.*;

public class Solution {

    public static void main(String[] args) {

        // Solution for part A.

        // creating a tree map, key is String and value is Integer
        TreeMap<String, Integer> treeMap = new TreeMap<>();

        // now put the given String into map
        treeMap.put("Hello", 0);
        treeMap.put("Today", 1);
        treeMap.put("Is", 2);
        treeMap.put("Monday", 3);

        // now loop through the treeMap
        for(Map.Entry<String, Integer> mapEntry: treeMap.entrySet()){

            // delete entry "Today"one by one
            if(mapEntry.getKey().equals("Today"))
                treeMap.remove("Today");
        }

        // now loop through the treeMap an print the remaining entries
        System.out.println("TreeMap entries after removing 'Today' is:");
        for(Map.Entry<String, Integer> mapEntry: treeMap.entrySet()){

            System.out.print(mapEntry.getKey() + " ");
        }


        // Solution for part B.


        // Create set using LinkedHashSet as child class
        // LinkedHashMap maintains the insertion order
        // add the given string
        Set<String> set = new LinkedHashSet<>(Arrays.asList(new String[]{"This", "Class", "is", "good", "We", "have", "learned,",
                "lot", "of", "things"}));

        // loop through the set using iterator
        Iterator iterator = set.iterator();
        while (iterator.hasNext()){
            // remove all String that starts with "C" or "o"
            String val = (String) iterator.next();
            if(val.charAt(0) == 'C' || val.charAt(0) == 'o'){
                // remove this val from set
                iterator.remove();
            }
        }

        // now print the set in single statement
        System.out.println("\n\nFinal set is: " + set);



    }
}

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// CODE

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