java - 将对象 w.r.t 列表排序为特定成员/状态

Question

我有一个包含 4 个成员的 java 对象列表。

int id;
String name;
String age;
int order;

我想根据名称对这个对象的列表进行排序

Answer 1

要么像这样实现一个Comparator:

public static void main(String[] args) throws IOException {

    List<MyObject> list = new ArrayList<MyObject>();

    // add your objects to the list     

    Collections.sort(list, new Comparator<MyObject>() {
        @Override
        public int compare(MyObject o1, MyObject o2) {
            return o1.name.compareTo(o2.name);
        }
    });
}

或者你可以在MyObject上实现Comparable接口(interface):

class MyObject implements Comparable<MyObject> {
    int id;
    String name;
    String age;
    int order;

    @Override
    public int compareTo(MyObject o) {
        return name.compareTo(o.name);
    }
}

public static void main(String[] args) throws IOException {
    ....
    Collections.sort(list); // with the comparable interface
}