如何用字串的輸入值命名一個新整數？

我有一個正在處理的任務，我需要創建一個系統來檢查輸入的字串是否已經存在于 ArrayList 中。在它不存在的情況下，它將使用輸入的確切文本的名稱生成一個新整數，并將值分配給 1。如果字串已經存在（意味著其他人已經輸入了該選項），那么它將添加一到已經存在的整數。我只是在努力用字串的值分配一個整數。

我嘗試直接獲取輸入并將其分配給一個字串，然后我嘗試使用字串值創建一個新整數。到目前為止，這一直不成功。

static int totalSubmissions = 0;  // tracks # of custom submissions (used to navigate Array List)
static ArrayList<String> userInputs = new ArrayList<String>(); // contains strings (not listed ice                     creams) from user input
private static JLabel pollOtherLabel = new JLabel("Unlisted Flavors: ");
private static JTextField customInput = new JTextField();
private static JButton submitInput = new JButton("Submit");

// Above is the totalSubmmissions (used to navigate ArrayList, the list itself, and my label, submit button, and the neccesary code to record what was entered.




@Override
        public void actionPerformed(ActionEvent e) {
            // checks vote chocolate and contains output
            if(e.getSource() == voteChocolate){
                chocolateVotes  ;
                pollOption1Label.setText("Chocolate Votes: "   chocolateVotes);
            } else if (e.getSource() == voteVanilla){ // checks vote vanilla and contains output
                vanillaVotes  ;
                pollOption2Label.setText("Vanilla Votes: "   vanillaVotes);
            } else if (e.getSource() == voteStrawberry){  // checks vote strawberry and contains output
                strawberryVotes  ;
                pollOption3Label.setText("Strawberry Votes: "   strawberryVotes);
            } else if (e.getSource() == submitInput){ // checks custom input and contains output
                String currentString = customInput.getText(); //  <<  ISSUE IS HERE 
                if (userInputs.contains(currentString)){     // want to assign the text field input 
                    int currentString = 1;                 // to a new integer, that will track
                } else {                         // the number of times that exact string is entered 
                    int customInput.getText() = 1;
                }
                userInputs.add(customInput.getText());
                customInput.setText("");
                pollOtherLabel.setText("Unlisted Flavors: "   userInputs.get(totalSubmissions));
                totalSubmissions  ;
            }
        }

uj5u.com熱心網友回復：

我猜這個任務有一些預定義的口味（巧克力、香草等），他們有指定的按鈕來投票。此外，它還允許您將自定義口味添加到集合中并計入其投票。

您不能在運行時初始化變數。這是因為您撰寫了代碼，因此計算機會為您運行它。您無法撰寫代碼，因此程式將自行撰寫更多新代碼。（至少這不是本次作業的目的）

在這種情況下，我建議您存盤風味并投票給統一的資料結構。我可以看到您將預定義的口味存盤在strawberryVotes,中chocolateVotes。您可以制作地圖來存盤您需要的所有資訊、預定義或自定義風味。您需要存盤2個資訊。1）風味名稱 2）投票。我們可以使用地圖。它的概念類似于一張桌子。

    static int totalSubmissions = 0; // tracks # of custom submissions (used to navigate Array List)

    private Map<String, Integer> flavorVotes = new HashMap<String, Integer>();
    // contains flavor and vote (not listed ice creams) from user input

    private static JLabel pollOtherLabel = new JLabel("Unlisted Flavors: ");
    private static JTextField customInput = new JTextField();
    private static JButton submitInput = new JButton("Submit");

    // define constant for predefined flavor
    private static final String FLAVOR_CHOCOLATE = "Chocolate";
    private static final String FLAVOR_VANILLA_ = "Vanilla";
    private static final String FLAVOR_STRAWBERRY_ = "Strawberry";

    // Above is the totalSubmmissions (used to navigate ArrayList, the list itself,
    // and my label, submit button, and the neccesary code to record what was
    // entered.

    @Override
    public void actionPerformed(ActionEvent e) {
        String flavor;
        // checks vote chocolate and contains output
        if (e.getSource() == voteChocolate) {
            flavor = FLAVOR_CHOCOLATE;
            addVote(flavor);
            pollOption1Label.setText("Chocolate Votes: "   flavorVotes.get(flavor));
        } else if (e.getSource() == voteVanilla) { // checks vote vanilla and contains output
            flavor = FLAVOR_VANILLA_;
            addVote(flavor);
            pollOption2Label.setText("Vanilla Votes: "   flavorVotes.get(flavor));
        } else if (e.getSource() == voteStrawberry) { // checks vote strawberry and contains output
            flavor = FLAVOR_STRAWBERRY_;
            addVote(flavor);
            pollOption3Label.setText("Strawberry Votes: "   flavorVotes.get(flavor));
        } else if (e.getSource() == submitInput) { // checks custom input and contains output
            flavor = customInput.getText();
            addVote(flavor);

            customInput.setText("");
            pollOtherLabel.setText("Unlisted Flavors: "   flavor);
            totalSubmissions  ;
        }
    }

    private void addVote(String flavor) {
        if (flavorVotes.containsKey(flavor)) {
            // flavor exists, increment by 1
            flavorVotes.put(flavor, flavorVotes.get(flavor)   1);
        } else {
            // new flavor, set its vote to 1
            flavorVotes.put(flavor, 1);
        }
    }

ps 我認為某些屬性不應該宣告為靜態的。但這是另一個話題。

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