1. 定义一个父类，并在其中添加用于排序的变量

public class MyObject {
    private int sortOrder;

    public int getSortOrder() {
        return sortOrder;
    }

    public void setSortOrder(int sortOrder) {
        this.sortOrder = sortOrder;
    }
}

2. 建立一个子类，并扩展父类，并初始化所需的变量

public class MyChildObject extends MyObject {
    private String name;
    private int age;

    public MyChildObject(String name, int age, int sortOrder) {
        this.name = name;
        this.age = age;
        setSortOrder(sortOrder);
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

3. 创建一个对象列表，并用子类填充它

List objList = new ArrayList<>();
objList.add(new MyChildObject("Amit", 20, 2));
objList.add(new MyChildObject("John", 25, 1));
objList.add(new MyChildObject("Smith", 18, 3));

4. 使用Java的Comparator对象对列表进行排序

Collections.sort(objList, new Comparator() {
    @Override
    public int compare(MyObject obj1, MyObject obj2) {
        return Integer.compare(obj1.getSortOrder(), obj2.getSortOrder());
    }
});