public class ThrowExample {    public static void main(String[] args) {        try {            _isLaw(1,2,3);  //是不是三角形        } catch (Exception e) {            System.out.println("异常信息："+e.getMessage());        }    }    /**     * 计算三角形的勾股定律     */    private static void  _isLaw(int a,int b,int c) {        if (a <=0 || b<=0 || c<=0) {            throw new IllegalArgumentException("传入的参数为负数！");        }        if (c*c != a*a + b*b) {            throw new IllegalArgumentException("不是三角形！");        }        System.out.println("是三角形");    }}