Question

java高手请进,画图程序的监听器不起作用,鼠标画图无响应,鼠标画不上去是什么问题?

//这是我的两个监听器：
class MouseA extends MouseAdapter {
public void mouseEntered(MouseEvent me) {
// TODO 鼠标进入
System.out.println("鼠标进入在：[" + me.getX() + " ," + me.getY() + "]");
}
public void mouseExited(MouseEvent me) {
System.out.println("鼠标退出在：[" + me.getX() + " ," + me.getY() + "]");
}
@Override
public void mousePressed(MouseEvent me) {
System.out.println("鼠标按下在：[" + me.getX() + " ," + me.getY() + "]");// 设置状态栏提示
itemList[curr].x1 = itemList[curr].x2 = me.getX();
itemList[curr].y1 = itemList[curr].y2 = me.getY();
curr++;
createNew();// 创建新的图形的基本单元对
repaint();
}
}
public void mouseReleased(MouseEvent me) {
// TODO 鼠标松开
System.out.println("鼠标松开在：[" + me.getX() + " ," + me.getY() + "]");
itemList[curr].x1 = itemList[curr].x2 = me.getX();
itemList[curr].y1 = itemList[curr].y2 = me.getY();
repaint();
curr++;
createNew();// 创建新的图形的基本单元对象
}
class MouseB extends MouseMotionAdapter {
public void mouseDragged(MouseEvent e)// 鼠标的拖动
{
System.out.println("鼠标拖动在：[" + e.getX() + " ," + e.getY() + "]");
itemList[curr - 1].x1 = itemList[curr].x2 = itemList[curr].x1 = e
.getX();
itemList[curr - 1].y1 = itemList[curr].y2 = itemList[curr].y1 = e
.getY();
curr++;
createNew();// 创建新的图形的基本单元对象
repaint();
}
public void mouseMoved(MouseEvent me)// 鼠标的移动
{
System.out.println("鼠标移动在：[" + me.getX() + " ," + me.getY() + "]");
}

}}
另附Drawing类：
public class Drawing implements Serializable {
int x1, y1, x2, y2;// 当前坐标
int R, G, B;// 当前色彩
Color c;
float f;// 当前笔触粗细
public void draw(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.drawLine(x1, y1, x2, y2);
}
}
class pencil extends Drawing {
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.drawLine(x1, y1, x2, y2);
}
}只要随笔画一个功能，就是用鼠标画图。请问监听器为什么没有响应？

Answer 1

这得看
itemList[curr - 1].x1 = itemList[curr].x2 = itemList[curr].x1 = e
.getX();
itemList[curr - 1].y1 = itemList[curr].y2 = itemList[curr].y1 = e
.getY();
curr++;
createNew();// 创建新的图形的基本单元对象
repaint();