Question

Create three classes in Java using either treeSet or hashSet implementation where users can able to add items, delete items, getItems, and search items in the list or from the list.

Answer 1

Java code to demonstrate

// the working of TreeSet

import java.util.*;

class TreeSetDemo {

    public static void main(String[] args)

    {

        TreeSet<String> ts

            = new TreeSet<String>();

        // Elements are added using add() method

        ts.add("Geek");

        ts.add("For");

        ts.add("Geeks");

        System.out.println(ts);

    }

}

Accessing the Elements: After adding the elements, if we wish to access the elements, we can use inbuilt methods like contains(), first(), last(), etc.

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// Java code to demonstrate // the working of TreeSet import java.util.*; class TreeSetDemo {     public static void main(String[] args)     {         TreeSet<String> ts             = new TreeSet<String>();         // Elements are added using add() method         ts.add("Geek");         ts.add("For");         ts.add("Geeks");         System.out.println("Tree Set is " + ts);         String check = "Geeks";         // Check if the above string exists in         // the treeset or not         System.out.println("Contains " + check                            + " " + ts.contains(check));         // Print the first element in         // the TreeSet         System.out.println("First Value " + ts.first());         // Print the last element in         // the TreeSet         System.out.println("Last Value " + ts.last());         String val = "Geek";         // Find the values just greater         // and smaller than the above string         System.out.println("Higher " + ts.higher(val));         System.out.println("Lower " + ts.lower(val));     } }

Removing the Values: The values can be removed from the TreeSet using the remove() method. There are various other methods which are used to remove the first value or the last value.

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// Java code to demonstrate // the working of TreeSet import java.util.*; class TreeSetDemo {     public static void main(String[] args)     {         TreeSet<String> ts             = new TreeSet<String>();         // Elements are added using add() method         ts.add("Geek");         ts.add("For");         ts.add("Geeks");         ts.add("A");         ts.add("B");         ts.add("Z");         System.out.println("Initial TreeSet " + ts);         // Removing the element b         ts.remove("B");         System.out.println("After removing element " + ts);         // Removing the first element         ts.pollFirst();         System.out.println("After removing first " + ts);         // Removing the last element         ts.pollLast();         System.out.println("After removing last " + ts);     } }

/ Java code to demonstrate

// the working of TreeSet

import java.util.*;

class TreeSetDemo {

    public static void main(String[] args)

    {

        TreeSet<String> ts

            = new TreeSet<String>();

        // Elements are added using add() method

        ts.add("Geek");

        ts.add("For");

        ts.add("Geeks");

        ts.add("A");

        ts.add("B");

        ts.add("Z");

        // Iterating though the TreeSet

        for (String value : ts)

            System.out.print(value

                             + ", ");

        System.out.println();

    }

}

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