java - 更改 Action 监听器中的变量数据

Question

我创建了一个包含 Action 监听器的按钮。我在 Action 监听器之外声明了该变量。但我无法更改 Action 监听器内的变量内容。我总是收到错误:从内部类引用的局部变量必须是最终的或有效的最终

如何解决这个问题？

我希望代码部分对您来说足够好。

我已经尝试过:

final int player = 1;

但是我无法用final改变内容。

public void Game(char[] gamefield) { 
    int player = 1;
    TickTackToeSpieleablauf window = new TickTackToeSpieleablauf();
    btnSpielebrett1.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
           //Field1
           int field = 0;
           boolean geklappt = false;
           geklappt = window.playervsplayer(gamefield, field, player);
           System.out.println(gamefield[0]);
           if (geklappt && player == 1){
               gamefield[field] = 'x';
               player = 2; <----- HERE I GET THE ERROR
           }else if(geklappt && player == 2){
               gamefield[field] = 'o';
           }else if(!geklappt){
                if (gamefield[0] != '1' && gamefield[1] != '2' &&gamefield[2] != '3' && gamefield[3] != '4' &&gamefield[4] != '5' && gamefield[5] != '6' &&gamefield[6] != '7' && gamefield[7] != '8' &&gamefield[8] != '9'){
                    //Gamefield full, array clear;
                        gamefield[0] = '1';
                        gamefield[1] = '2';
                        gamefield[2] = '3';
                        gamefield[3] = '4';
                        gamefield[4] = '5';
                        gamefield[5] = '6';
                        gamefield[6] = '7';
                        gamefield[7] = '8';
                        gamefield[8] = '9';
                }
           }else{
               System.out.println("Feld bereits belegt.");
           }
}

Answer 1

Ypu 可以为您的 player 值提供一个包装类，例如:

class Player {
    int value = 1;
}

并使用对该类的引用而不是原始类型:

final Player player = new Player();

...

if (geklappt && player.value == 1){
      gamefield[field] = 'x';
      player.value = 2;
}