point location 窗体相对于屏幕的位置
size size 窗体的大小
rectangle bounds 等于rectangle(location,size)
int width =size.width 窗体的宽度
int height =size.height
int left =location.x 窗体的最左上角X的坐标值
int top =location.y
int right =location.x + size.width 窗体的最右X坐标值
int bottom =location.y+size.height 窗体的最下Y坐标值