BigDecimal compareTo 空指针

碰到一个 BigDecimal 的空指针

    @Test
    public void testNull(){
        int i = BigDecimal.ZERO.compareTo(null);
        System.out.println(i);
    }

此时会抛出空指针异常，查一下源码

public int compareTo(BigDecimal val) {
        // Quick path for equal scale and non-inflated case.
        if (scale == val.scale) {  // [1]
            long xs = intCompact;
            long ys = val.intCompact;
            if (xs != INFLATED && ys != INFLATED)
                return xs != ys ? ((xs > ys) ? 1 : -1) : 0;
        }
        int xsign = this.signum();

问题出在位置 [1] 这里