day 05 Coin

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day 05 Coin

coin

package com.wengkai.coins;import com.wengkai.hash.Hash;import java.util.HashMap;
import java.util.Scanner;public class Coin
{   //Hash表//所有类型必须是对象，而不能是基本元素private HashMap<Integer, String> coinnames = new HashMap<Integer, String>();public Coin(){coinnames.put(1, "penny");//key valuecoinnames.put(10, "dime");coinnames.put(25, "quarter");coinnames.put(50, "half-dolar");coinnames.put(50, "五毛");//唯一System.out.println(coinnames.keySet().size());//4System.out.println(coinnames);//{1=penny, 50=五毛, 25=quarter, 10=dime}for (Integer k : coinnames.keySet()){String s = coinnames.get(k);System.out.println(s);//penny 五毛 quarter dime}}public String getName(int amount){if (coinnames.containsKey(amount)) return coinnames.get(amount);else return "NOT FOUND";}public static void main(String[] args){Scanner in = new Scanner(System.in);int amount = in.nextInt();Coin coin = new Coin();String name = coin.getName(amount);System.out.println(name);//五毛}
}