Java图形界面作业题 题目要求： 窗体内“单击鼠标左键”，在鼠标处绘制一个“绿圆” 窗体内“单击鼠标右键”，在鼠标处绘制一个“红色方框” 窗体内“双击鼠标左键”，清空所有已画“圆”和“方”(Java graphic interface homework Title requirements: In the form, click the left mouse button, and draw a green circle at the mouse&quo