"如何从绑定的 ComboBox 中为项目添加价格？"

Question

我正在尝试了解Hashtable<\/code>和HashMap<\/code>之间的区别，并尝试在此处为这些项目添加特定价格。 目标是将从comboItem<\/code>中选择的项目的价格打印到txtPrice<\/code>中。

        String[] items = {"Select Item","Betta Fish","Snail","Supplies","Food"};
        comboGroup = new JComboBox<String>(items);
        comboGroup.addActionListener(this);
        comboGroup.setBounds(130,35,150,40);
        
        comboItem = new JComboBox<>();
        comboItem.setPrototypeDisplayValue("XXXXXXXXXXX");
        comboItem.setBounds(130,85,150,40);
        
        String[] subItems1 = {"Select Betta","Plakat","Halfmoon","Double Tail","Crown Tail"};
        subItems.put(items[1], subItems1);
        
        String[] subItems2 = {"Select Snail","Pond Snail","Ramshorn","Apple Snail","Assassin Snail"};
        subItems.put(items[2], subItems2);
                
        String[] subItems3 = {"Select Supply","Small Fine Net","Large Fine Net","Flaring Mirror","Aquarium Hose (1meter)"};
        subItems.put(items[3], subItems3);
        
        String[] subItems4 = {"Select Food","Daphnia","Tubifex","Mosquito Larvae","Optimum Pellets"};
        subItems.put(items[4], subItems4);
        comboGroup.setSelectedIndex(1);      
        
        //TextFields <- this is the attempt to add price to subItems value but commented out
        /*int[] items1price = {0,150,350,200,200};
        subItems.put(items[1], items1price);
        int[] items2price = {0,15,25,80,120};
        subItems.put(items[2], items2price);
        int[] items3price = {0,50,80,25,15};
        subItems.put(items[3], items3price);
        int[] items4price = {0,50,100,50,50};
        subItems.put(items[4], items4price);
        comboGroup.setSelectedIndex(1);
        */
        txtPrice = new JTextField();
        txtPrice.setBounds(130,135,150,40);

Answer 1

阅读代码后，不清楚您的目的是什么。