Java JButton中的合成与继承
我想通过Swing创建一个简单的桌面游戏。我有一个JFrame和一个JPanel变量 我想向这个JPanel添加JButtons,但我想创建一个自己的类 我创建了一个扩展JButton(继承)的类: 所以我可以在JPanel中添加游戏场 但我想通过组合创建游戏场:Java JButton中的合成与继承,java,swing,inheritance,Java,Swing,Inheritance,我想通过Swing创建一个简单的桌面游戏。我有一个JFrame和一个JPanel变量 我想向这个JPanel添加JButtons,但我想创建一个自己的类 我创建了一个扩展JButton(继承)的类: 所以我可以在JPanel中添加游戏场 但我想通过组合创建游戏场: public class GameField{ private JButton button; } 但在这门课中,我如何将游戏场添加到JPanel? 我可以通过compision解决这个问题吗?如果您希望您的游戏场对象有
public class GameField{
private JButton button;
}
但在这门课中,我如何将游戏场添加到JPanel?
我可以通过compision解决这个问题吗?如果您希望您的游戏场对象有JComponents,并且仍然能够将它们添加到其他JComponents,请让它们扩展
JPanel
,而不是JButton
然后,您可以将游戏场对象作为JPanel与其他JComponents一起添加到JFrame中
但在这门课中,我如何将游戏场添加到JPanel?我能解决这个问题吗
比较问题
为此,您可以添加一个简单的getter,如下所示:
public class GameField{
private JButton button;
public GameField(String text) {
button = new JButton(text);
// do your stuff here
}
public JButton getButton() {
return button;
}
}
然后在GUI中:
public void createAndShowGUI() {
JPanel panel = new JPanel(new GridLayout(5,5));
panel.add(new GameField("Button # 1").getButton());
panel.add(new GameField("Button # 2").getButton());
...
JFrame frame = new JFrame("Game");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
编辑 你在评论中说:
谢谢,但在这种情况下,如果我想访问此字段(即。 getComponent(i)),我只能得到一个JButton,而不能得到一个游戏场 您可以保留包含
游戏场
对象的列表,也可以使用方法保留对游戏场
对象的引用,如下例所示:
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Demo {
private void createAndShowGUI() {
ActionListener actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JButton button = (JButton)e.getSource();
GameField gameField = (GameField)button.getClientProperty("GameField");
if(gameField != null) {
System.out.println(gameField.getText());
}
}
};
GameField gameField1 = new GameField("Button # 1");
gameField1.getButton().addActionListener(actionListener);
GameField gameField2 = new GameField("Button # 2");
gameField2.getButton().addActionListener(actionListener);
JPanel content = new JPanel(new GridLayout());
content.add(gameField1.getButton());
content.add(gameField2.getButton());
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(content);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
class GameField {
private String text;
private JButton button;
public GameField(String text) {
this.text = text;
button = new JButton(text);
button.putClientProperty("GameField", GameField.this);
}
public JButton getButton() {
return button;
}
public String getText() {
return text;
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Demo().createAndShowGUI();
}
});
}
}
谢谢,但在这种情况下,如果我想访问此字段(即panel.getComponent(I)),我只能获得一个JButton,而不能获得游戏字段。@user2693979请查看我的编辑。希望对您有所帮助。谢谢,这帮了大忙。:)+1避免延伸回转组件。
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Demo {
private void createAndShowGUI() {
ActionListener actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JButton button = (JButton)e.getSource();
GameField gameField = (GameField)button.getClientProperty("GameField");
if(gameField != null) {
System.out.println(gameField.getText());
}
}
};
GameField gameField1 = new GameField("Button # 1");
gameField1.getButton().addActionListener(actionListener);
GameField gameField2 = new GameField("Button # 2");
gameField2.getButton().addActionListener(actionListener);
JPanel content = new JPanel(new GridLayout());
content.add(gameField1.getButton());
content.add(gameField2.getButton());
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(content);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
class GameField {
private String text;
private JButton button;
public GameField(String text) {
this.text = text;
button = new JButton(text);
button.putClientProperty("GameField", GameField.this);
}
public JButton getButton() {
return button;
}
public String getText() {
return text;
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Demo().createAndShowGUI();
}
});
}
}