Question

java小白求助 eclipse JButton 数组，事件监听 buttons【num】.addActionListener(this); 报错

用数组添加事件监听 buttons【num】.addActionListener(this); 出错
应该怎么对数组添加事件啊？

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class DeckOfCards extends JFrame {
private Card deck[];
private int currentCard;
private JButton dealButton, shuffleButton;
private JLabel status;
private JPanel panel1, panel2;
private JButton[] buttons;
int num;

public DeckOfCards() {
super("Card Grid Game");

this.setSize(525, 450); // set the window size
this.setVisible(true); // show the window

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

String faces[] = { "Ace", "Deuce", "Three", "Four", "Five", "Six"};
String suits[] = { "Hearts", "Diamonds", "Clubs", "Spades" };

deck = new Card[24];
currentCard = -1;

for (int i = 0; i < deck.length; i++)
deck[i] = new Card(faces[i % 6], suits[i / 6]);

JPanel panel1 = new JPanel();
shuffleButton = new JButton("Shuffle cards");
panel1.add(shuffleButton);

shuffleButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {

for(num = 0; num <9 ;num ++)
{
buttons[num].setEnabled(true);
buttons[num].setText(""+num);

}

status.setText("SHUFFLING ...");
shuffle();

Card dealt = dealCard();
if (dealt != null)
{
status.setText(dealt.toString());
shuffleButton.setEnabled(false);
}
else
{
status.setText("SHUFFLE CARDS TO BEGIN");
}
}
});

status = new JLabel("SHUFFLE CARDS TO BEGIN");
panel1.add(status);

dealButton = new JButton("Deal card");

JPanel panel2 = new JPanel();
panel2.setLayout(new GridLayout(3,3));

buttons = new JButton[9];

for(num = 0; num <9 ;num ++)
{

buttons[num] = new JButton("");
panel2.add(buttons[num]);
buttons[num].setEnabled(false);

}

getContentPane().setLayout(new BorderLayout());
getContentPane().add("North",panel1);
getContentPane().add("Center",panel2);

}

public static void main(String args[]) {
DeckOfCards app = new DeckOfCards();

}
}

Answer 1

没仔细看代码，数组监听事件不得用循环语句一条一条添加么。。你试试给数组的父容器添加监听事件看看~~

Answer 2

你的代码没仔细看，下次提问的时候记得先把异常信息贴出来，不然没人去构建环境再给你的代码运行一遍，再看看是什么异常……