java - 如何在Java中为字符串数组列表分配双值？

对于此代码，我创建了一个数组列表，其中提示用户将String类型的硬币输入“钱包”，然后将其添加到数组列表中。我有一个返回数组列表的方法，可以打印出列表中的硬币。我创建了其他几种以多种方式作用于数组列表的方法。我遇到的主要问题是创建一个名为Coin的类，在其中我想为数组列表'coins'中输入的每个硬币分配一个值。这将使我能够创建一种方法来累加“硬币”数组中每个硬币的值，或者创建一种方法来花费“硬币”数组中的硬币。我曾考虑过在Coins类中添加一个公共void setType（输入的String）方法来为输入的每个硬币分配一个值，但是我不完全确定该怎么做。但是，一旦完成，我就知道要创建一个列表：List coinPocket = new ArrayList （）;以及一个私有方法，该方法将Coin类中的值添加到数组列表中：ArrayList coin = new ArrayList（）;。我想知道是否有人知道我会怎么做。到目前为止，这是我的所有代码：public class Coin{ private String type; private String currencyType; private double penny = 0.01; private double quarter = 0.25; private double dime = 0.10; private double nickle = 0.05; public void setType(String entered) { }}import java.util.ArrayList;import java.util.Scanner;import java.util.Collections;import java.util.List;/** * * A class that contains methods and variables for adding and rearranging coins in a purse. An array list of coins; two variables, TERMINATE to stop adding coins and coinEntered to represent a coin in the purse; and a Scanner for user input are used. */public class Purse{ ArrayList<String> coins = new ArrayList<String>(); List<Coin> coinPocket = new ArrayList<>(); Scanner in = new Scanner(System.in); private final String TERMINATE = "Q"; private String coinEntered = " "; private void addCoins(String coinType) { Coin cash = new Coin(); cash.setType(coinType); coinPocket.add(cash); } /** * A method that allows the user to add coins to their purse and second purse, assuming it is American currency. If it is not American currency, the user is asked to enter the correct currency. The user will be prompted to press Q to quit adding coins once they have added them all. * @param coinName * */ public void addCoin(String coinName) { System.out.println("Which coin would you like to add? PENNY, NICKLE, DIME, or QUARTER? Press Q to stop adding coins."); while (!coinEntered.equals(TERMINATE)) { coinEntered = in.nextLine(); if (coinEntered.equals("PENNY") || coinEntered.equals("NICKLE") || coinEntered.equals("DIME") || coinEntered.equals("QUARTER") || coinEntered.equals(TERMINATE)) { coins.add(coinEntered); coins.remove(TERMINATE); } else { System.out.println("Sorry! You can only add American currency to the purse. Please add American currency."); } } } /** * Prints out the purse and its contents after adding coins. * @return * Purse with added coins. */ public ArrayList<String> printPurseContents() { return coins; } /** * Reverses the order of the coins in a purse, then prints out the contents of the purse in reverse order. * @return * Reverse order of array of coins. */ public ArrayList<String> reverse() { Collections.reverse(coins); return coins; } /** * A method that allows the user to transfer coins in a purse to a different purse. The coins transfered from the original purse will leave that purse empty. * @param otherPurse * */ public void transfer(Purse otherPurse) { coins.addAll(otherPurse.coins); otherPurse.coins.clear(); } /** * Method that checks whether one purse has the same coins in the same order as another purse. * @param otherPurse * @return Prints true if the contents of each purse have the same coins and the same order of coins, or false if the contents of each purse do not have the same coins and the same order of coins. */ public boolean sameContents(Purse otherPurse) { if(otherPurse.coins.equals(coins)) { System.out.println("It is true that each purse has the same coins in the same order."); return true; } else { System.out.println("It is false that each purse has the same coins in the same order."); return false; } } /** * Method that checks whether one purse has the same coins as another purse regardless of the order of coins. * @param otherPurse * @return Prints true if each purse has the same coins as another purse regardless of order, or prints false if each purse does not have the same coins as another purse regardless of order. */ public boolean sameCoins(Purse otherPurse) { if(otherPurse.coins.containsAll(coins)) { System.out.println("It is true that each purse has the same coins regardless of order."); return true; } else { System.out.println("It is false that each purse has the same coins regardless of order."); return false; } } public void addTotalCoins() { } public void spendCoin() { }}public class PurseMain{ public static void main(String[] args) { Purse johnnysPurse = new Purse(); Purse otherPurse = new Purse(); johnnysPurse.addCoin(null); otherPurse.addCoin(null); System.out.println("Purse " + johnnysPurse.printPurseContents()); System.out.println("Purse " + otherPurse.printPurseContents()); System.out.println(); System.out.println(otherPurse.sameContents(johnnysPurse)); System.out.println(); System.out.println(otherPurse.sameCoins(johnnysPurse)); System.out.println(); }} (adsbygoogle = window.adsbygoogle || []).push({}); 最佳答案 如果我正确理解了您的问题，则想请用户输入“ PENNY”，“ DIME”等字符串，然后在其中创建一个Coin。为此，您可以使用带有属性的枚举，例如：enum CoinType { PENNY(0.01), NICKLE(0.05) DIME(0.1), QUARTER(0.25); private final double value; private CoinType( double v ) { value = v; } public double getValue() { return value; }}然后要求用户输入数字（提供选择列表）或名称。假设您要求输入名称，则可以执行以下操作：CoinType type = CoinType.valueOf( coinEntered );如果用户输入了错误的名称，请捕获IllegalArgumentException。关于java - 如何在Java中为字符串数组列表分配双值？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32400257/ (adsbygoogle = window.adsbygoogle || []).push({});