按Java中的姓氏和名字对对象的ArrayList进行排序 [英] Sorting an ArrayList of Objects by Last name and firstname in Java

问题描述

我有一个基于体育的不同类型球员的阵列列表。我需要按照姓氏对arrayList中的玩家列表进行排序才能开始。如果2个玩家具有相同的姓氏，则需要按照名字对这2个玩家进行排序。
示例：格式姓氏名字
Williams Robert
Phillips Warren
Doe John
Phillips Mark

I have an arrayList of different types of players based on sports. I need to sort the list of players in the arrayList by last name to start. If 2 players have the same last name it needs to then sort those 2 players by the first name. example: Format Lastname firstname Williams Robert Phillips Warren Doe John Phillips Mark

输出应该是
Doe John
Phillips Mark
Phillips Warren
Williams Robert

Output should be Doe John Phillips Mark Phillips Warren Williams Robert

我现在只有第一个或者最后我在我的代码中使用最后一个atm。

What i have now only sorts by either the first or last i have it by last atm in my code.

   public static void sortPlayers(ArrayList playerList) {
    for (int i = 0; i < playerList.size(); i++) {
        for (int j = 0; j < playerList.size(); j++) {
            Collections.sort(playerList, new Comparator() {

                public int compare(Object o1, Object o2) {
                    PlayerStats p1 = (PlayerStats) o1;
                    PlayerStats p2 = (PlayerStats) o2;
                    return p1.getPlayerLastName().compareToIgnoreCase(p2.getPlayerLastName());
                }
            });
        }

    }
}

推荐答案

将比较器更改为：

            public int compare(Object o1, Object o2) {
                PlayerStats p1 = (PlayerStats) o1;
                PlayerStats p2 = (PlayerStats) o2;
                int res =  p1.getPlayerLastName().compareToIgnoreCase(p2.getPlayerLastName());
                if (res != 0)
                    return res;
                return p1.getPlayerFirstName().compareToIgnoreCase(p2.getPlayerFirstName())
            }

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