Java提供了三角函数方法，直接调用cos()方法就可以根据x坐标计算出y坐标。需要注意的是，cos()方法输入的参数是弧度值，要进行坐标转换，同样，得到的结果也要进行转换处理。- Java provides a trigonometric method, a direct call cos () method can be calculated based on the x coordinate y coordinates. It should be noted that the para