CODEWITHSUNDEEP
javaarrays
user2297518
user2297518

Reputation: 45

Linking Arrays in Java

I'm new to Java, and I'm dealing with arrays. I have two arrays and would like to link them so that the elements in the second array correspond to those in the first. That way, I can search an element in the first array and display the corresponding value in the second array.

short[] Years = {2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012};

String[] Months = {"January", "February", "June", "January", "March", "June", "July", "August", "September", "March", "November", "March", "June"};

I'm trying to link it so that when I search March, for example, it displays 2004, 2009, 2011

List<String> results = new ArrayList<String>();
for (String s : months)
{
    if(s.equals(term))
    {
        results.add(s);
    }
}
if (results.size() > 0)
{
    System.out.println("The month " + term + "appears " + results.size() + " times");
}
else
{
    System.out.println("Your search for " + term + " did not return any results");
}

I have this code to show how many times a month appears, I just need it to print out the years after this.

Upvotes: 2

Views: 9626

Answers (3)

Joe Coder
Joe Coder

Reputation: 4525

That's an "associative array" or a "map". Here is a Java example of the Map interface.

Map<String, String> userEmails = new HashMap<String, String>();
userEmails.put("Tony", "[email protected]");
userEmails.put("Ozzy", "[email protected]");

Let's find Ozzy and print his email address:

System.out.println(userEmails.get("Ozzy"));

Map is the interface. It has operations "put" and "get". HashMap is a popular implementation of "Map" in which the map keys (the usernames) have unique hashcodes.

Upvotes: 4

akki0996
akki0996

Reputation: 713

Take a look at my code, I explained all of what I did. 

import java.util.Scanner;

public class GetPrice {
    public static void main(String args[]) {

        // You can add any number of elements in both the arrays. The lengths 
        // should, of course, be the same for both the arrays.

        String items[] = { "pizza", "cheesebread", "stromboli" };
        double prices[] = { 1.1, 2.2, 3.3 };

        // What we need to do is, once the user inputs the item, we need to
        // search the string and find the index. As the prices are in the
        // corresponding indices on the other array, we can just use the index
        // number to get the price from the other array. So we just use the same
        // index but on a different array.

        System.out.println("Choose from the following, to get the price: ");
        for (int index = 0; index < items.length; index++)
            System.out.println(items[index]);

        System.out.println("\nEnter the item: ");
        Scanner input = new Scanner(System.in);
        String inputItem = input.next();

        for (int index = 0; index < items.length; index++) {
            if (items[index].equals(inputItem.toLowerCa… {
                System.out.println("Price for '" + items[index] + "' is: " + prices[index]);
            }
        }
    }
}

Upvotes: 1

Arun P Johny
Arun P Johny

Reputation: 388446

Try

short[] Years = { 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
        2009, 2010, 2011, 2012 };
String[] Months = { "January", "February", "June", "January", "March",
        "June", "July", "August", "September", "March", "November",
        "March", "June" };

String term = "March";
List<Short> indexes = new ArrayList<Short>();
for (int i = 0; i < Months.length; i++) {
    String string = Months[i];
    if (term.equals(string)) {
        indexes.add(Years[i]);
    }

}

for (Short short1 : indexes) {
    System.out.print(short1);
}

Update:

    Scanner keyboard = new Scanner(System.in);

    short[] Years = { 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
            2009, 2010, 2011, 2012 };
    String[] Months = { "January", "February", "June", "January", "March",
            "June", "July", "August", "September", "March", "November",
            "March", "June" };

    String term = keyboard.next();

    List<String> results = new ArrayList<String>();
    for (String s : Months) {
        if (s.equals(term)) {
            results.add(s);
        }
    }
    if (results.size() > 0) {
        System.out.println("The month " + term + "appears "
                + results.size() + " times");
    } else {
        System.out.println("Your search for " + term
                + " did not return any results");
    }

    List<Short> indexes = new ArrayList<Short>();
    for (int i = 0; i < Months.length; i++) {
        String string = Months[i];
        if (term.equals(string)) {
            indexes.add(Years[i]);
        }

    }

    for (Short short1 : indexes) {
        System.out.print(short1);
    }
}

It gives me the following output for input March

The month Marchappears 3 times
200420092011

Upvotes: 0

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