Question

我是Java的新手，我正在处理数组。我有两个数组，并希望链接它们，以便第二个数组中的元素对应于第一个中的元素。这样，我可以搜索第一个数组中的元素，并在第二个数组中显示相应的值。

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"};

我正在尝试关联它，以便在我搜索March时，例如，它会显示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");
}

我有这个代码来显示一个月出现的次数，我只需要打印出这个年后的几年。

Answer 1

这是一个“关联数组”或“地图”。这是一个Java示例。

Map<String, String> userEmails = new HashMap<String, String>();
userEmails.put("Tony", "tony@metal.com");
userEmails.put("Ozzy", "ozzy@metal.com");

让我们找到Ozzy并打印他的电子邮件地址：

for (String user : userEmails.keySet()) {
    if ("Ozzy".equals(user)) {
        System.out.println(userEmails.get(user));
    }
}

Map是界面。它有“put”和“get”操作。 HashMap是“Map”的流行实现，其中地图键（用户名）具有唯一的哈希码。

Answer 2

看看我的代码，我解释了我所做的一切。

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]);
            }
        }
    }
}

Answer 3

尝试

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);
}

更新

    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);
    }
}

它为输入March

提供了以下输出

The month Marchappears 3 times
200420092011

在Java中链接数组

3 个答案: