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根据物体变量列出的物体清单
原标题:Sorting an Array List of Objects based on a variable in object

页: 1

Array清单所列物体是称为“模块Info”的学院(课程、任务、dateDue)的资料。

日表格式改为“YYYYMMDD”(日历)。

我审视了一些人这样做的其他一些方式,但我可以直头谈谈我需要做些什么。

Ideally because I ve already stated when creating the Array List that it will contain ModuleInfo objects I could just Collection.sort(moduleDB, ModuleInfo.getDateDue) or something along those lines. moduleDB being the Array List

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最佳回答

如果您希望使用<条码> 孔隙(List list)对您的名单进行分类,则您的标语必须执行<条码>。 比较接口。

public class ModuleInfo implements Comparable<ModuleInfo> {

    /* Your implementation */

    public int compareTo(ModuleInfo info) {
        if (this.dateDue < info.dateDue) {
            return -1;
        } else if (this.dateDue > info.dateDue) {
            return 1;
        } else {
            return 0;
        }
    }
}

Then call Collections.sort(moduleDB) where moduleDB has type ArrayList<ModuleInfo>.

p.s. 如前一个职位所述,您的班级也可使用<代码>Comparator接口,以取得相同结果。

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