Question

Write a program that reads in a series of first names and eliminates duplicates by storing them in a Set. Allow the user to search for a first name.

(Trust me, I am not taking any Java classes. So, not my homework).

My issue is to implement this: Allow the user to search for a first name.

Everything else works, just the search feature.

My Code so far….

package com.Sets;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Scanner;
import java.util.Set;

public class DuplicateElimination {

    public static void main(String[] args) {

        // Write a program thats ask for first names and store it in an array.

        String fName;

        Scanner input = new Scanner(System.in);
        String[] names = new String[10];

        for (int i = 0; i < names.length; i++) {
            System.out.println("Enter First Name: ");
            names[i] = input.nextLine();
        }
        // Printout that array as a list.
        List<String> list = Arrays.asList(names);

        // Initial Array Elements
        System.out.printf("%s ", list);
        System.out.println();

        // Calling removeDuplicates method
        removeDuplicates(list);

    }

    // Make a method called removeDuplicates.
    private static void removeDuplicates(Collection<String> values) {

        // Implement a Hashset in it.
        Set<String> set = new HashSet<String>(values);

        // Printout a non-duplicate list of elements.
        for (String value : set) {
            System.out.printf("%s ", value);
        }

        System.out.println();

    }

    // Make a method to search for a first name.
    public static void searchForName(Collection<String> names) {

        String someName;

        Set<String> set = new HashSet<String>(names);
        Scanner input = new Scanner(System.in);


        for (int i = 0; i <= 10; i++) {
            System.out.println("Search this name: ");
            someName = input.nextLine();
        }

        if (someName ) {

        } else {

        }
    }

}

I don’t feel confident about my searchForName method… can someone give an idea on how I could make this work?

Answer 1

use set.contains() method to check if a set contains the input string.

   for (int i = 0; i <= 10; i++) {
            System.out.println("Search this name: ");
            someName = input.nextLine();
        }

if(set.contains(someName)) {
System.out.println("set contains name");

}
else {
System.out.println("set doesnt contain this name");
}