我正在使用 Netbeans 创建一个匹配游戏，但不是 GUI 编辑器（它很烂）。因此，基本上，我创建了一个名为 Card 的新类，它扩展了 JButton 类。在构建时，按钮的大小设置为 100px x 100px 并设置了一个图标。当我将按钮添加到 GridBagLayout 中的 JPanel 时，它不是预期的大小。
这是我的一些代码：
JFRAME 类：
package matchinggame;
... imports ...
public class MatchingGameWindow extends JFrame {
Card[] cards = new Card[16]; //16 game cards
public MatchingGameWindow() {
...
//Create new game panel (for the cards)
JPanel gamePanel = new JPanel(new GridBagLayout());
//gamePanel.setSize(500,500); removed as it is not needed.
...
this.add(gamePanel, BorderLayout.CENTER);
//Create 16 card objects
cards = createCards();
//Create new grid bag constraints
GridBagConstraints gbc = new GridBagConstraints();
//Add the cards to the game panel
int i=0;
for (int y = 0; y < 4; y++) {
gbc.gridy = y;
for (int x = 0; x < 4; x++) {
gbc.gridx = x;
gamePanel.add(cards[i], gbc);
i++;
}
}
}
public final Card[] createCards() {
Card[] newCards = new Card[16];
//New choices array
ArrayList<Integer> choices = new ArrayList();
int[] choiceValues = {0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7};
//Add the initial choice values to the arraylist
for (int i=0; i < choiceValues.length; i++) {
choices.add(choiceValues[i]);
}
//Create 16 cards
for (int i=0; i < 16; i++) {
//Initial value of -1 for error checking
int iconIndex = -1;
//Loop until card is created
while (iconIndex == -1) {
//Get a random number from 0 - 7
Random r = new Random();
int rInt = r.nextInt(8);
//If the random number is one of the choices
if (choices.contains(rInt)) {
//the icon # will be the random number
iconIndex = rInt;
//Get rid of that choice (it is used up)
choices.remove(new Integer(rInt));
//Create a new Card in the Card[]
newCards[i] = new Card(i,iconIndex);
//If all the choices are gone
} else if (choices.isEmpty()){
iconIndex = -1; //done creating this card (breaks out of loop)
}
}
}
//Return the created cards
return newCards;
}
}
卡类：
package matchinggame;
import javax.swing.ImageIcon;
import javax.swing.JButton;
public class Card extends JButton {
final static ImageIcon defaultIcon = new ImageIcon("cardback.jpg");
ImageIcon secretIcon;
boolean isRevealed = false;
...
public Card(final int cardIndex, int secretIconIndex) {
//Size is 100px by 100px
setSize(100, 100);
//Default icon is card back image
setIcon(defaultIcon);
//Get the secret icon behind the back of the card
secretIcon = icons[secretIconIndex];
}
}
使用这段代码，我得到了这样的结果：
关于我在这里做错了什么的任何想法？
编辑：我重写了 getPreferredSize 方法，就像 Hovercraft Full Of Eels 说的那样，它奏效了！我在 Card 类中添加了这段代码：
@Override
public Dimension getPreferredSize() {
return new Dimension(100,100);
}
并得到了我想要的结果：
现在我必须对图标做错了，因为它们没有按应有的方式显示。