在我点击北按钮后,我试图将代表我的玩家耐力的 double 值添加到 jTextArea 中,但似乎无法做到这一点,这是我的代码:
private void northButtonActionPerformed(java.awt.event.ActionEvent evt)
{
game.playerMove(MoveDirection.NORTH);
update();
double playerStamina = player.getStaminaLevel();
//tried this
String staminaLevel = Double.toString(playerStamina);
jTextArea1.setText("Stamina: " + staminaLevel);
}
我是新来的,如果这不对,抱歉
这是主要方法
public class Main
{
/**
* Main method of Lemur Island.
*
* @param args the command line arguments
*/
public static void main(String[] args)
{
// create the game object
final Game game = new Game();
// create the GUI for the game
final LemurIslandUI gui = new LemurIslandUI(game);
// make the GUI visible
java.awt.EventQueue.invokeLater(new Runnable()
{
@Override
public void run()
{
gui.setVisible(true);
}
});
}
这就是类(class)
public class LemurIslandUI extends javax.swing.JFrame
{
private Game game;
private Player player;
/**
* Creates a new JFrame for Lemur Island.
*
* @param game the game object to display in this frame
*/
public LemurIslandUI(final Game game)
{
this.game = game;
initComponents();
createGridSquarePanels();
update();
}
private void createGridSquarePanels() {
int rows = game.getIsland().getNumRows();
int columns = game.getIsland().getNumColumns();
LemurIsland.removeAll();
LemurIsland.setLayout(new GridLayout(rows, columns));
for (int row = 0; row < rows; row++)
{
for (int col = 0; col < columns; col++)
{
GridSquarePanel panel = new GridSquarePanel(game, row, col);
LemurIsland.add(panel);
}
}
}
/**
* Updates the state of the UI based on the state of the game.
*/
private void update()
{
for(Component component : LemurIsland.getComponents())
{
GridSquarePanel gsp = (GridSquarePanel) component;
gsp.update();
}
game.drawIsland();
}
最佳答案
您的类似乎没有实现 ActionListener
,因此按钮上的操作不会被触发。
你的类声明应该是:
public class LemurIslandUI extends javax.swing.JFrame implements ActionListener
并将按钮操作的代码放入其中:
public void actionPerformed(ActionEvent e) {}
或者,您可以使用匿名类
来实现按钮的代码,而不是让您的类实现ActionListener
。像这样的东西:
final JButton button = new JButton();
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent actionevent)
{
//code
}
});
关于java - 向 JTextArea 添加 double ?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19541895/