如何按三个不同排序优先级的字段对对象列表进行排序？[复制]

问：

我对 Java 中的排序不是很熟悉，我遇到过这样一种情况，假设我有一个包含各种字段（memNum、accountAge、points）的 Member 对象列表。Member 的构造函数如下所示：

Member(String memNum, int accountAge, int points)

假设以下成员组成了该列表：

        Member mem1 = new Member("10543A", 12, 90);
        Member mem2 = new Member("10543A", 12, 70);
        Member mem3 = new Member("10543A", 12, 230);
        Member mem4 = new Member("10543A", 15, 80);
        Member mem5 = new Member("10543A", 15, 90);
        Member mem6 = new Member("10234B", 20, 90);
        Member mem7 = new Member("10234B", 20, 70);
        Member mem8 = new Member("10234B", 12, 230);
        Member mem9 = new Member("10234B", 14, 80);
        Member mem10 = new Member("10234B", 15, 90);
        Member mem11 = new Member("24577D", 204, 900);
        Member mem12 = new Member("24577D", 204, 18);
        Member mem13 = new Member("24577D", 204, 72);
        Member mem14 = new Member("24577D", 50, 80);
        Member mem15 = new Member("24577D", 60, 90);

我想先按 memNum 对这个列表进行排序，然后按 accountAge，然后按点对，所有这些都按升序排列，因此最终列表如下所示：

        ("10234B", 12, 230)
        ("10234B", 14, 80)
        ("10234B", 15, 90)
        ("10234B", 20, 70)
        ("10234B", 20, 90)
        ("10543A", 12, 70)
        ("10543A", 12, 90)
        ("10543A", 12, 230)
        ("10543A", 15, 80)
        ("10543A", 15, 90)
        ("24577D", 50, 80)
        ("24577D", 60, 90)
        ("24577D", 204, 18)
        ("24577D", 204, 72)
        ("24577D", 204, 900)   

我怎样才能做到这一点？