如果按下按钮,如何从调用的方法获取返回值？

Question

所以我有一个按钮,按下后,通过使用actionListener调用以下方法:

public Die[] roll(){

    Die[] playerRoll = new Die[5];

    //code goes in here...

    return playerRoll;
}

按下按钮后我想访问返回的playerRoll数组,但我不知道该怎么做.这是我试过的:

Die[] returnedArray  = throwButton.addActionListener(new MyActionListener());

但它给了我一个错误的说法 Type mismatch: Cannot convert from void to Die[]

我的整个代码工作包括actionListener中的代码,我只是想访问返回的变量.如果您需要其他代码,我将编辑此帖子.

编辑.我尝试尽可能少地粘贴代码,因为有很多代码所以我尝试粘贴相关的东西:

 public class Dice {
 static JButton throwButton = new JButton("Throw!");
static JButton scoreTitle = new JButton("Score!");
 static JLabel playerRoll1 = new JLabel();
static JLabel playerRoll2 = new JLabel();
static JLabel playerRoll3 = new JLabel();

 Die[] playerCurrentRoll;
 boolean playerRolled = false;
 static JButton throwButton = new JButton("Throw!");
 frame.getContentPane().add(scoreTitle);
 frame.getContentPane().add(playerRoll1);
    frame.getContentPane().add(playerRoll2);
    frame.getContentPane().add(playerRoll3);
 public static void main(String[] args) {
    JFrame frame = new JFrame();
    JPanel jp = new JPanel();
    frame.setContentPane(jp);

    frame.getContentPane().add(throwButton);
 throwButton.addActionListener(new MyActionListener());
 frame.setVisible(true);
    frame.setSize(400, 400);
}

public Die[] roll() {
Die[] playerRoll = new Die[5];
//A lot of code in here but it basically populates the playRoll array. 
//This part of the code does work.
return playerRoll

}

public void scoreMethod() {
for (int i =0; i < playerCurrentRoll.length; i++) {
        humanTotal += playerCurrentRoll[i].getValue();
        humanScore.setText(Integer.toString(humanTotal));
    }
}

}

public class MyActionListener implements ActionListener {
Dice diceobj = new Dice();

public void actionPerformed(ActionEvent e) {

    if (e.getSource() == Dice.throwButton) {
        // diceobj.roll();
        diceobj.playerCurrentRoll = diceobj.roll();
        System.out.println(diceobj.playerCurrentRoll);

        diceobj.computerCurrentRoll = diceobj.roll();
    }else if(e.getSource() == Dice.scoreTitle){
        diceobj.scoreMethod();
        System.out.println("Called the score method");

    }


}

}

似乎我没有粘贴我的代码.有些部分可能会丢失,但我可以保证一切正常.我知道这一点,因为当我按下Throw按钮时,它会给我输出数组(如system.out.println中的myactionlistener类所示).给我数组的内存地址.当我按下分数按钮并且它指向包含错误的行时它不起作用:

for (int i =0; i < playerCurrentRoll.length; i++) {

位于scoreMethod(); 在骰子课上.

Answer 1

试试这个

Die[] returnedArray; // member variable

// Inside the container's constructor
throwButton.addActionListener(new MyActionListener());

public Die[] roll(){
    Die[] playerRoll = new Die[5];

    //code goes in here...
    return playerRoll;
}

// Your custom ActionListener
class MyActionListener implements ActionListener {
    @Override
    public void onActionPerformed(ActionEvent e) {
         returnedArray = roll();
    }
}