用Java初始化2D数组

Question

I am trying to make a menu like this for a user

to select a wine type (riesling, chardonnay) and then from that, it shows them the variations of the column the selected. The loop is supposed to cycle at most 16 times, or until the user indicates they're done. This is just one method that I am trying to complete right now.

I wanted to know if I was heading in the right direction. I have made the main method but I wanted to know how to make the method for gathering the input(user enters 1 for riesling, 1 for dry, then it totals it) all inside of a loop.

I would really appreciate it if someone could just help me figure this out. Thank you so much.

import javax.swing.JOptionPane;

public class WineCalc{

public static void main(String[] args){

  String[][]wineTypes = {
                        {"Riesling", "Chardonnay", "Sauvignon Blanc", "Merlot"},
                        {"Dry- $4.50", "Apple- $6.00", "Lime-$4.50", "Plum- $5.00"},
                        {"Off Dry-$4.00", "Lemon-$5.50", "Lemongrass- $6.50", "Black Cherry- $7.50"},
                        {"Sweet- $5.00", "Vanilla- $6.00", "Coconut- $7.00", "Chocolate- $6.00"},
                        };
  double[][]prices = {
                     {4.50, 6.00, 4.50, 5.00},
                     {4.00, 5.50, 6.50, 7.50},
                     {5.00, 6.00, 7.00, 6.00},
                     };

  int[][]counter = {
                   {0,0,0,0},
                   {0,0,0,0},
                   {0,0,0,0},
                   };

}

public static int getWineType(String wineTypes[][]){





return wineTypes[][];
}
}

Answer 1

you need to add qoutation marks areound the worrds in the winetypes array.

String[][]wineTypes = {
                    {"Riesling", "Chardonnay", "Sauvignon Blanc", "Merlot"},
                    {"Dry- $4.50", "Apple- $6.00", "Lime-$4.50", "Plum- $5.00"},
                    {"Off Dry-$4.00", "Lemon-$5.50", "Lemongrass- $6.50", "Black Cherry- $7.50"},
                    {"Sweet- $5.00", "Vanilla- $6.00", "Coconut- $7.00", "Chocolate- $6.00"},
                    };

also you need to add commas between the entries in the prices array

double[][]prices = {
                 {4.50, 6.00, 4.50, 5.00},
                 {4.00, 5.50, 6.50, 7.50},
                 {5.00, 6.00, 7.00, 6.00}
                 };

finaly you need to create the methods getWineType(int wineTypes[][]); and getMostOrdered(int wineTypes[][]); and getCombo(int wineTypes[][]); and printReport(int wineTypes[][]);

Answer 2

Just to put you more on the right track I will show you Java's Object Oriented way of doing things.

public class Wine{
    private final String name;
    private final List<Type> types = new ArrayList<>();
    private final Map<String, Type> typeMap = new HashMap<>();

    public Wine(String name){
        this.name = name;
    }

    public Wine addType(String name, double price){
        addType(new Type(name, price));
        return this;
    }

    public Wine addType(Type type){
        types.add(type);
        typeMap.put(type.getName(), type);
        return this;
    }

    public Wine.Type get(int index){
        return types.get(index);
    }

    public Wine.Type get(String type){
        return typeMap.get(type);
    }

    public boolean hasType(String type){
        return typeMap.containsKey(type);
    }

    public int totalWineTypes(){
        return types.size();
    }

    @Override
    public String toString(){
        return new StringBuilder().append("[Wine = ").append(name).append(" ").append(types).toString();
    }


    public class Type{
        private final String name;
        private double price;
        public Type(String name, double price){
            this.name = name;
            this.price = price;
        }

        public String getName(){
            return name;
        }

        public double getPrice(){
            return price;
        }

        @Override
        public String toString(){
            return Wine.this.name + "[" + name + ", " + price + "]";
        }
    }
}

main method

public static void main(String[] args) {
    Wine[] wines = new Wine[]{
            new Wine("Riesling").addType("Dry", 4.5).addType("Off Dry", 4.0).addType("Sweet", 5.0),
            new Wine("Chardonnay").addType("Apple", 6.0).addType("Lemon", 5.5).addType("Vanilla", 6.0),
    };
    for (Wine w : wines) {
        System.out.println(w);
        if(w.hasType("Apple")){
            Wine.Type t = w.get("Apple");
            System.out.println();
            System.out.println(t.getName() + " -> " + t.getPrice());
            System.out.println(t);
        }

    }
}

It will display this when run

[Wine = Riesling [Riesling[Dry, 4.5], Riesling[Off Dry, 4.0], Riesling[Sweet, 5.0]]
[Wine = Chardonnay [Chardonnay[Apple, 6.0], Chardonnay[Lemon, 5.5], Chardonnay[Vanilla, 6.0]]

Apple -> 6.0
Chardonnay[Apple, 6.0]