【发布时间】：2019-03-11 05:39:17
【问题描述】：
我正在尝试使用摇摆创建一个二十一点应用程序，当玩家单击点击按钮时，我很难添加新牌。我觉得这与未验证 JLabel 有关，但我不知道这真正意味着什么或如何解决这些问题。请帮忙...
我真的是 Java swing 的新手，所以它可能看起来非常直观的问题，但我希望有人能善意地解释......
下面是我目前拥有的代码，它为经销商和玩家各发两张牌，没有重复牌，但即使选择了这张牌，也无法显示新发的牌，因为我可以在控制台上看到它们......
import javax.swing.*;
import java.awt.*;
@SuppressWarnings("serial")
public class PlayerHand extends JPanel {
//declaring private vars
private JLabel cardPonTable[] = new JLabel[11];
private int cardP[] = new int[11];
private Image cardPImage[] = new Image[11];
private int cardOnTableCount = 0; //counter for number of cards on the table
public PlayerHand(boolean firstDeal){
setLayout(null);
/**
* Deals the first two cards for the player
*/
if (firstDeal == true) { //run this code if true
//playerHand config
setBackground(new Color(238, 238, 238));
setLayout(null);
JLabel playersHandLabel = new JLabel("Player's Hand"); //creates a label indicating the bottom half of the screen is the player's hand
//player's hand label config
playersHandLabel.setFont(new Font("Lucida Grande", Font.PLAIN, 25));
playersHandLabel.setHorizontalAlignment(SwingConstants.CENTER);
playersHandLabel.setBounds(192, 314, 200, 80);
add(playersHandLabel); //add player's hand label to the container
//creates JLabel for two of the player's card, set the positions, and add to the container
cardPonTable[0] = new JLabel("");
cardPonTable[0].setBounds(80, 6, 220, 320);
add(cardPonTable[0]);
cardPonTable[1] = new JLabel("");
cardPonTable[1].setBounds(340, 6, 220, 320);
add(cardPonTable[1]);
System.out.println("Player's cards"); //indicate that the following is the player's dealt card on the console
CardDeal.createDeck(); //create a deck
//deal two card for the player
cardP[0] = CardDeal.cardDeal();
cardP[1] = CardDeal.cardDeal();
//get the image from the src folder
cardPImage[0] = new ImageIcon (this.getClass().getResource(cardP[0]+".png")).getImage();
cardPImage[1] = new ImageIcon (this.getClass().getResource(cardP[1]+".png")).getImage();
cardPonTable[0].setIcon(new ImageIcon (cardPImage[0])); //set the JLabel of the card to the image chosen above
cardOnTableCount++; //increase the counter by one
cardPonTable[1].setIcon(new ImageIcon (cardPImage[1])); //set the JLabel of the card to the image chosen above
cardOnTableCount++; //increase the counter by one
}
/**
* Do not deal the first two cards (instance made)
*/
}
public void cardAdded() throws Exception {
//cardP1onTable.setBounds(cardP1onTable.getX()-50, cardP1onTable.getY(), (int)(WIDTH*0.7), (int)(HEIGHT*0.7));
//cardP2onTable.setBounds(cardP2onTable.getX()-50, cardP2onTable.getY(), (int)(WIDTH*0.7), (int)(HEIGHT*0.7));
PlayerHand newDealt = new PlayerHand(false); //creates an instance of playerHand method (send false as a parameter so that the method won't deal two cards again)
System.out.println("Player's card dealt");
newDealt.setLayout(null);
cardPonTable[cardOnTableCount] = new JLabel("");
cardPonTable[cardOnTableCount].setBounds(192, 6, 220, 320);
newDealt.add(cardPonTable[cardOnTableCount]);
cardP[cardOnTableCount] = CardDeal.cardDeal();
cardPImage[cardOnTableCount] = new ImageIcon (newDealt.getClass().getResource(cardP[cardOnTableCount]+".png")).getImage();
cardPonTable[cardOnTableCount].setIcon(new ImageIcon (cardPImage[cardOnTableCount]));
cardOnTableCount++;
}
}
下面这段代码是让玩家选择命中或停留的JPanel
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JPanel;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
@SuppressWarnings("serial")
public class ChoiseBar extends JPanel{
private JButton hitButton;
private JButton stayButton;
public ChoiseBar() {
Dimension dim = getPreferredSize();
dim.height = 100;
setPreferredSize(new Dimension(1200, 100));
hitButton = new JButton("HIT");
hitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
PlayerHand.cardAdded();
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
stayButton = new JButton("STAY");
setLayout(new GridLayout(0, 2, 0, 0));
add(hitButton);
add(stayButton);
}
}
这是添加 PlayerHand、DealerHand 和 ChoiceBar 的 MainFrame 类。
import javax.swing.JFrame;
import java.awt.Color;
@SuppressWarnings("serial")
public class MainFrame extends JFrame{
//declaring private vars
private DealerHand dealerHand;
private PlayerHand playerHand;
private ChoiseBar choiseBar;
public MainFrame() {
super("TABLE"); //calling the "TABLE" method in BJ_APP
playerHand = new PlayerHand(true); //creates an instance of playerHand (firstDeal is true as it is the first deal)
//playerHand config
playerHand.setForeground(new Color(0, 0, 0));
playerHand.setBackground(new Color(238, 238, 238));
playerHand.setLocation(300, 625);
playerHand.setSize(600, 400);
dealerHand = new DealerHand(); //creates an instance of dealerHand
//playerHand config
dealerHand.setLocation(300, 31);
dealerHand.setSize(600, 429);
choiseBar = new ChoiseBar(); //creates an instance of choiseBar
//choiseBar config
choiseBar.setSize(800, 120);
choiseBar.setLocation(214, 472);
getContentPane().setLayout(null); //mainFrame uses absolute layout
//add these three containers to mainFrame
getContentPane().add(choiseBar);
getContentPane().add(playerHand);
getContentPane().add(dealerHand);
setSize(1200,1080); //set the size of mainFrame
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //the program will terminated when mainFrame is closed
this.setVisible(true); //set mainFrame visible
}
}
【问题讨论】：
-
不要调用
validate()方法。您需要创建revalidate()方法。当您不使用 LayoutManager (setLayout(null)) 时，这两种方法都不起作用。我建议您使用 LayoutManager 重新开始。 -
1) 不要使用静态变量。您的代码应该使用实例变量。最好不要使用单个变量，使用数组，这样您就可以通过使用索引来访问卡片，这将简化您的代码。 2）摆脱静态方法。您再次向类添加自定义方法，因此它们不需要是静态的。 3) 类名应以大写字符开头。 4) 查看Overlap Layout，它可以让您轻松添加显卡。
-
@GeorgeZ。谢谢你的建议。我不能使用绝对布局并验证我的组件？
-
@camickr 谢谢你的建议。根据您的建议，我对代码进行了几处更改。我已经相应地更新了上面的代码，还添加了另一类 JPanel，让用户选择点击或停留。但是，在 'PlayerHand.cardAdded();' ，它说“不能从 PlayerHand 类型对非静态方法 cardAdded() 进行静态引用”并建议我将 cardAdded() 更改为静态。
-
当您创建“PlayerHand”面板时，您需要保留对面板的引用。然后，当您创建“ChoiceBar”时，将对 PlayerHand 的引用传递给 ChoiceBarl。现在，ChoiceBar 可以使用此引用调用 PlayerHand 面板中的任何方法..