你如何从外部 paint() 绘制变量?

Question

我希望能够从外部paint((访问数组。有没有办法在 main 方法中声明数组，然后在 paint(( 中使用值并使用 g.drawString(( 绘制？

public class design
{
public static void main (String[] args)
{
JFrame window = new JFrame ("Game Screen");
window.getContentPane ().add (new drawing ());
window.setSize (500, 500);
window.setVisible (true);
window.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
}
}
class drawing extends JComponent
{
public void paint (Graphics g)
{
int[] [] word = {{5, 3, 0, 0, 7, 0, 0, 0, 0},
{6, 0, 0, 1, 9, 5, 0, 0, 0},
{0, 9, 8, 0, 0, 0, 0, 6, 0},
{8, 0, 0, 0, 6, 0, 0, 0, 3},
{4, 0, 0, 8, 0, 3, 0, 0, 1},
{7, 0, 0, 0, 2, 0, 0, 0, 6},
{0, 6, 0, 0, 0, 0, 2, 8, 0},
{0, 0, 0, 4, 1, 9, 0, 0, 5},
{0, 0, 0, 0, 9, 0, 0, 7, 9}};
Graphics2D g2 = (Graphics2D) g;
Rectangle rect;
for (int x = 0 ; x < 9 ; x++)
{
for (int y = 0 ; y < 9 ; y++)
{
rect = new Rectangle (x * 50 + 5, y * 50 + 5, 50, 50);
g2.draw (rect);
if (word [y] [x] == 0)
{
g.drawString (" ", x * 50 + 30, y * 50 + 30);
}
else
g.drawString (Integer.toString (word [y] [x]), x * 50 + 25, y * 50 + 35);
}
}
g.fillRect (153, 5, 3, 450);
g.fillRect (303, 5, 3, 450);
g.fillRect (5, 153, 450, 3);
g.fillRect (5, 303, 450, 3);
}
}

Answer 1

是的，有。类的实例可以具有可以在其自己的代码中访问的变量，并且可以在实例化时请求这些变量。所以在这里，当你声明你的绘图类时，你可以给它一个 int[][] 的变量。这看起来像

class drawing extends JComponent {
private int[][] word;
public drawing(int[] [] word) { 
//This replaces your normal contstructor. So instead of calling "new drawing()" you will call 
//"new drawing(word)" where word is your instantiated array.
this.word = word; //this assigns the word you were given to your class's variable
}
public void paint(Graphics g) { ...

在这里你继续，但你不必声明你的数组。您已经在 main 方法的第二行中声明了数组，然后在声明新绘图时将其传递到绘图中。

希望这有帮助！