按多个字段对对象列表进行排序

您的比较器如下所示：

public class GraduationCeremonyComparator implements Comparator<GraduationCeremony> {    public int compare(GraduationCeremony o1, GraduationCeremony o2) {        int value1 = o1.campus.compareTo(o2.campus);        if (value1 == 0) { int value2 = o1.faculty.compareTo(o2.faculty); if (value2 == 0) {     return o1.building.compareTo(o2.building); } else {     return value2; }        }        return value1;    }}

基本上，只要到目前为止已比较的属性相等（

== 0