接收"错误：在井字游戏中检查 JButton 状态时不允许' void '类型

Question

我有9个场景制作一个9条件语句，将查看是否所有我的JButton已按下，没有找到赢家，但它给我" error: ' void '类型不允许这里。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TicTacToe extends JFrame
{
private final int HEIGHT = 450;
private final int WIDTH = 500;
private static JButton [] button = new JButton[9];
private static Action [] playerTurn = new Action[9];
private static JLabel [] label;
private int player = 1;
private Font arial = new Font("Arial", Font.BOLD, 20);
private static int lockButtons = 0;

public TicTacToe ()
{
    setTitle( " tic tak tow ");
    setSize( HEIGHT, WIDTH);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    setLayout(new GridLayout(4,3));
    int num = 0;
    for(int i = 0; i < 9; i++ )
    {
        button[i] = new JButton( "B" + i + 1);
        playerTurn[i] = new Action();
        add(button[i]);
        button[i].setFont(arial);
        button[i].addActionListener(playerTurn[i]);
    }

    setVisible(true);
}
private class Action implements ActionListener
{
    public void actionPerformed(ActionEvent playerMove)
    {
        //Get button pressed using GetSource Command
        JButton whatPlayer=(JButton)(playerMove.getSource());
            if(player == 1)
            {
                player++;
                whatPlayer.setText("player1");
                whatPlayer.setEnabled(false); 
                validate(); 
                return;
            }               
            if (player == 2)
            {
                player--;
                whatPlayer.setText("player2");
                whatPlayer.setEnabled(false);
                validate(); 
                return;
            }
    }
    public void validate()
    {
        if(button[0].getText().equals(button[1].getText()) && button[1].getText().equals(button[2].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[0].getText());
            gameOver();
        }
        if(button[3].getText().equals(button[4].getText()) && button[4].getText().equals(button[5].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[3].getText());
            gameOver();
        }
        if(button[6].getText().equals(button[7].getText()) && button[7].getText().equals(button[8].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[6].getText());
            gameOver();
        }
        if(button[0].getText().equals(button[3].getText()) && button[3].getText().equals(button[6].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[0].getText());
            gameOver();
        }
        if(button[1].getText().equals(button[4].getText()) && button[4].getText().equals(button[7].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[1].getText());
            gameOver();
        }
        if(button[1].getText().equals(button[4].getText()) && button[4].getText().equals(button[7].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[1].getText());
            gameOver();
        }
        if(button[2].getText().equals(button[5].getText()) && button[5].getText().equals(button[8].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[2].getText());
            gameOver();
        }
        if(button[0].getText().equals(button[4].getText()) && button[4].getText().equals(button[8].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[0].getText());
            gameOver();
        }
        if(button[2].getText().equals(button[4].getText()) && button[4].getText().equals(button[6].getText()))
        {
            JOptionPane.showMessageDialog(null,"Thank you the winner is" + button[2].getText());
            gameOver();
        }
        if ( button.length == setEnabled(false))  // this is the problem.  Don't know if I worded it correctly
        {
            JOptionPane.showMessageDialog(null,"This was a Draw");
        }
    }
    public void gameOver()
    {
        for( int x = 0; x < button.length; x++)
        {
            button[x].setEnabled(false);
        }
    }

}
public static void main(String[] arg)
{
    new TicTacToe();
}   
}

Answer 1

按钮。Length将等于9，因为您定义了一个包含9个元素的数组

private static JButton [] button = new JButton[9];

如何在if循环中进行if ( button.length == setEnabled(false))比较?setEnabled(false)将禁用JFrame并且返回类型为void，这里你将int与void进行比较，这就是为什么在编译时抛出错误。

int i;
for(i=0;i<button.length;i++){
     if(b[i].isEnabled()){
     break;
     }
}
if(i==button.length){
JOptionPane.showMessageDialog(null,"This was a Draw");
}