编写一个程序。在窗口四角绘制4个50×50的蓝色矩形，在窗口正中绘制1个100×50的色椭圆形。4个矩形之间用橙色粗实线连接。-To write a program. 4 5050 blue rectangle is drawn in the window corners, and a 10,050-color oval drawn to the middle of the window. With four rectangular the orange thick solid line con

三角形面积的计算公式JAVA,但是还是分享-this is one formula which can calculate the whole area of rectangle.