为前面所编写的Point类增加一个方法，用于设置Point的x值。该方法会抛出异常（异常需要自己定义），条件是：当设置的x值不在[0,100]区间时抛出异常。写测试程序对抛出的异常进行捕获和处理。-Written before the Point class to add a method for the set the Point of x value. This method will throw an exception (Exception own definition): throw an exception when the x value is not set [0,100] range. Write a test program to catch and handle the exception thrown.