如何在java小程序中更改数组中的特定图片?
我正在做一个蛇和梯子的游戏,我有一个小问题。我无法移动这些碎片
基本上,我有一个64块的网格,在一个数组中有64张图片。我也有两张和瓷砖大小相同的图片,我用它们作为移动的部件
当我点击jb按钮时,图片应该会更新
以下是我的代码和我尝试过的内容:
public class SnakesandLadders extends Applet implements ActionListener
{
//Part of the grid
int row = 8;
JLabel a[] = new JLabel [(row*row) + 1];
Panel g = new Panel (new GridLayout (row, row));
JLabel grid;
JButton roll;
int playerNum = 1;
int p1space = 0;
int p2space = 0;
public void init ()
{
//The Roll Button
roll = new JButton ("ROLL");
roll.addActionListener (this);
roll.setActionCommand ("roll");
//The Grid Displayed using a for loop
for (int rownum = 7 ; rownum >= 0 ; rownum--)
{
int number = rownum*8;
if (rownum % 2 != 0)
{
for (int i = 7 ; i >= 0 ; i--)
{
a [i+number] = new JLabel (createImageIcon ((i+number) + ".jpg"));
g.add (a [i+number]);
}
}
else
{
for (int i = 0; i < 8; i++)
{
a [i+number] = new JLabel (createImageIcon ((i+number) + ".jpg"));
g.add (a [i+number]);
}
}
}
add (g);
add (roll);
}
public void actionPerformed (ActionEvent e)
{
if (e.getActionCommand ().equals ("roll"))
{//NEED TO FIX THIS PART
{
int n = (int) ((Math.random () * 6) + 1);
playerNum++;
//To choose which picture to update
if (playerNum % 2 != 0) {
turn.setText ("It is Player 1's Turn");
p1space = p1space + n;
a[p1space] = new JLabel (createImageIcon ("p1.jpg"));
}
else {
turn.setText ("It is Player 2's Turn");
p2space = p2space + n;
a[p2space] = new JLabel (createImageIcon("p2.jpg"));
}
}
}
//The picture update method
protected static ImageIcon createImageIcon (String path)
{
java.net.URL imgURL = SnakesandLadders.class.getResource (path);
if (imgURL != null)
{
return new ImageIcon (imgURL);
}
else
{
System.err.println ("Couldn't find file: " + path);
return null;
}
}
}
代码运行,但没有图片更新。我确信我在逻辑上犯了一个错误,我不知道如何将数组中的图片更改为player1和player2。谢谢你的帮助
编辑:我还想了解如何在再次单击滚动按钮时删除上一个图标。谢谢
# 1 楼答案
在执行更改后,需要调用revalidate()和repaint()方法,这将在小程序中重新加载更改。 在方法末尾添加这两个方法,如下所示
# 2 楼答案
您没有将创建的新标签添加到
g
,因此g
无法调用paint
方法来呈现标签您可以使用^{} 来更改图像,而不是创建新的
JLabel
: