BigDecimal比较大小

    @Test
    public void compareTo() {
        BigDecimal a = new BigDecimal(10);
        BigDecimal b = new BigDecimal(5);

        if (a.compareTo(b) == 0)
            System.out.println("a = b");

        if (a.compareTo(b) < 0)
            System.out.println("a < b");

        if (a.compareTo(b) > 0)
            System.out.println("a > b");

        if (a.compareTo(b) != 0)
            System.out.println("a != b");

        if (a.compareTo(b) != -1)
            System.out.println("a >= b");

        if (a.compareTo(b) != 1)
            System.out.println("a <= b");
    }