JAVA用throw手动抛出异常

throw
手动抛出异常
执行异常的抛出动作

private static double divide(double a, double b) {
        if(b==0){
            //新建异常对象
            ArithmeticException e = new ArithmeticException("/ by zero 异常");
            //把异常对象抛回到调用位置
            throw e;
        }
        return a/b;
    }