我正在嘗試優化如下所示的代碼片段：
public class Kvarteret {
public static final String ONE_BEER = "hansa";
public static final String ONE_CIDER = "grans";
public static final String REAL_BEER = "vestkyst";
public static final String GT = "gt";
public static final String BACARDI_SPECIAL = "bacardi_special";
public int calculatePrice(String drink, boolean student, int amount) {
if (amount > 2 && (drink == GT || drink == BACARDI_SPECIAL)) {
throw new RuntimeException("Too many drinks, max 2.");
}
int price;
if (drink.equals(ONE_BEER)) { price = 74;}
else if (drink.equals(ONE_CIDER)) { price = 103;}
else if (drink.equals(REAL_BEER)) { price = 110; }
else if (drink.equals(GT)) { price = ingredient6() ingredient5() ingredient4();}
else if (drink.equals(BACARDI_SPECIAL)) {
price = ingredient6()/2 ingredient1() ingredient2() ingredient3();
} else { throw new RuntimeException("Item not in menu"); }
if (student && (drink == ONE_BEER || drink == ONE_CIDER || drink == REAL_BEER)) { price = price - price/10;}
return price*amount;
}
//rom unit
private int ingredient1() { return 65;}
// grenadine unit
private int ingredient2() { return 10;}
//lime-juice unit
private int ingredient3() { return 10;}
//mint-leafs unit
private int ingredient4() { return 10; }
//tonic-water unit
private int ingredient5() { return 20; }
//gin unit
private int ingredient6() { return 85; }
}
該代碼是一個計算飲料價格的簡單程式。我使用這段代碼作為起點，因為看起來我們正在嘗試做類似的事情。
到目前為止，我的代碼如下所示：
import java.util.*;
public class Kvarteret2 {
private static double price;
private static double order;
// Enums defines common values
private enum Beer_Cider {
BEER("Hansa", 74), CIDER("Grans", 103), REAL_BEER("Vestkyst", 110);
private static String order;
Beer_Cider(String order, double cost) {
order = order;
price = cost;
}
private static String getOrder() {return order;}
private static double getCost() {return price;}
}
private enum DrinkIngredients {
ROM("Rom", 65), GRENADINE("Grenadine", 10), LIME("Lime-juice", 10),
MINT("Mint", 10), TONIC("Tonic-water", 20), GIN("Gin", 85);
private static String ingredient;
DrinkIngredients(String ingredient, double cost){
ingredient = ingredient;
price = cost;
}
private static String getIngredient() {return ingredient;}
private static double getCost() {return price;}
}
// Dictionary with the drink as Key and a list of the ingredients and prices as value
Map<String, List<DrinkIngredients>> Drinks = new HashMap<String, List<DrinkIngredients>>();
public Kvarteret2() {
Drinks.put("GT", [DrinkIngredients.GIN, DrinkIngredients.TONIC, DrinkIngredients.MINT]);
}
private static double calculate_price(String drink, boolean student, int amount){
if (amount > 2) {
throw new IllegalArgumentException("Too many drinks! You can order max 2 drinks at a time.");
}
double student_discount = 0.1;
if (student){
if (drink == "BEER" || drink == "CIDER" || drink == "REAL BEER") {
price = amount * (price - price * student_discount);
}
}
return price;
}
}
由于此代碼，我收到錯誤訊息：
public Kvarteret2() {
Drinks.put("GT", [DrinkIngredients.GIN, DrinkIngredients.TONIC, DrinkIngredients.MINT]);
}
我正在嘗試向字典中添加元素，但我認為這不是正確的方法。我知道我的代碼可能還沒有 100% 優化，但我只是想看看在我嘗試使它變得更好之前是否可以使這個解決方案作業（因為很可能有更好的方法來做到這一點）。如何正確創建我嘗試使用列舉創建的字典？感謝所有幫助！
uj5u.com熱心網友回復：
雖然你沒有提到你得到了什么錯誤，但這是你可以如何填充你的Kvarteret2建構式：
// Dictionary with the drink as Key and a list of the ingredients and prices as value
Map<String, List<DrinkIngredients>> Drinks = new HashMap<String, List<DrinkIngredients>>();
List<DrinkIngredients> list=new ArrayList<DrinkIngredients>(); // define ArrayList outside constructor
public Kvarteret2() {
list.add(DrinkIngredients.GIN);
list.add(DrinkIngredients.TONIC);
list.add(DrinkIngredients.MINT);
Drinks.put("GT", ls);
}
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