Java 简单游戏抛出堆栈溢出错误
我做了一个简单的游戏,在光标所在的位置画一个图像。它工作了一段时间,但很快就会抛出StackOverflowerr异常Java 简单游戏抛出堆栈溢出错误,java,stack-overflow,Java,Stack Overflow,我做了一个简单的游戏,在光标所在的位置画一个图像。它工作了一段时间,但很快就会抛出StackOverflowerr异常 public class Graphic extends JComponent { private ImageIcon imgIcon = new ImageIcon("/Users/Koolkids/Documents/codeStuff/Java/BattleOfTheEmojis/src/img/happy.png"); private Image img = imgIc
public class Graphic extends JComponent {
private ImageIcon imgIcon = new ImageIcon("/Users/Koolkids/Documents/codeStuff/Java/BattleOfTheEmojis/src/img/happy.png");
private Image img = imgIcon.getImage();
private Point cursor = new Point(0, 0);
public MouseMotionAdapter m = new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
super.mouseMoved(e);
cursor = e.getPoint();
}
};
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setBackground(Color.WHITE);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
this.addMouseMotionListener(m);
g2.drawImage(img, cursor.x - 11, cursor.y - 11, 22, 23, this);
repaint();
}
}
输出
Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at java.awt.AWTEventMulticaster.mouseMoved(AWTEventMulticaster.java:329)
at java.awt.AWTEventMulticaster.mouseMoved(AWTEventMulticaster.java:329)
at java.awt.AWTEventMulticaster.mouseMoved(AWTEventMulticaster.java:329)
并且永远如此。不要调用
repaint
,也不要在paint
方法中添加侦听器
每次需要更新/绘制组件时,Swing都会调用paint
方法repaint
方法安排组件进行重绘,这会导致调用paint
。因此,在paint
内部调用repaint
是一种无休止的循环
侦听器只应添加一次到组件,例如,在创建组件时
当组件的表示形式发生更改时,应调用
repaint
,例如,在更改光标后,在侦听器内部调用
,Java UI代码对此没有经验,但是-通过调用this.addMouseMotionListener(m),您似乎正在每一帧添加一个新的事件侦听器在你的画图函数中添加code>,并删除super.mouseMoved(e)代码>