画直线 drawLine(int x1, int y1, int x2, int y2)Parameters:
x1 - the first point's x coordinate.
y1 - the first point's y coordinate.
x2 - the second point's x coordinate.
y2 - the second point's y coordinate画空心圆 drawOval(int x, int y, int width, int height)
实心圆 fillOval(int x, int y, int width, int height)Parameters:
x - the x coordinate of the upper left corner of the oval to be filled.
y - the y coordinate of the upper left corner of the oval to be filled.
width - the width of the oval to be filled.
height - the height of the oval to be filled.
x1 - the first point's x coordinate.
y1 - the first point's y coordinate.
x2 - the second point's x coordinate.
y2 - the second point's y coordinate画空心圆 drawOval(int x, int y, int width, int height)
实心圆 fillOval(int x, int y, int width, int height)Parameters:
x - the x coordinate of the upper left corner of the oval to be filled.
y - the y coordinate of the upper left corner of the oval to be filled.
width - the width of the oval to be filled.
height - the height of the oval to be filled.
还有个问题问大家，本来我的窗口有一些输入框，按钮之类的东西，用
drawLine(int x1, int y1, int x2, int y2) 画一条直线后，就都被覆盖了（就像放上了一张画有一条直线的灰色的纸）然后随便点到哪个控件，哪个上面的“纸”就破了看到下面的控件
我想画的线是在运行某些东西后填上去的，有什么办法让我只填加一条线，而不要那个灰色的背景？还有，JAVA 里可不可以指定像 PANEL 那样的控件，在里面画图，并且坐标的值也是根据在 PANEL 的对位置来算而不是相对原来那个窗口