Java的Comparable 与 Comparator 的区别

news2026/5/4 4:34:39

Comparable是让子类可比较,Comparator是提供给Collections.sort的比较器importjava.util.ArrayList;importjava.util.Collections;importjava.util.Comparator;importjava.util.List;publicclassMain{/** 实现 Comparable自然顺序按年龄升序 */staticclassStudentimplementsComparableStudent{finalStringname;finalintage;finalintscore;Student(Stringname,intage,intscore){this.namename;this.ageage;this.scorescore;}OverridepublicintcompareTo(Studento){returnInteger.compare(this.age,o.age);}OverridepublicStringtoString(){returnname(ageage, scorescore);}}publicstaticvoidmain(String[]args){ListStudentlistnewArrayList();list.add(newStudent(Alice,20,88));list.add(newStudent(Bob,18,92));list.add(newStudent(Carol,19,79));// 1) Comparablesort 无第二参数用 Student.compareTo → 按年龄ListStudentbyAgenewArrayList(list);Collections.sort(byAge);System.out.println(Comparable自然顺序按年龄: byAge);// 2) Comparator外部规则按分数降序ListStudentbyScoreDescnewArrayList(list);Collections.sort(byScoreDesc,(a,b)-Integer.compare(b.score,a.score));System.out.println(Comparator按分数降序: byScoreDesc);// 3) Comparator按姓名字典序与自然顺序无关ListStudentbyNamenewArrayList(list);Collections.sort(byName,Comparator.comparing(s-s.name));System.out.println(Comparator按姓名: byName);}}

本文来自互联网用户投稿，该文观点仅代表作者本人，不代表本站立场。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如若转载，请注明出处：http://www.coloradmin.cn/o/2544905.html

如若内容造成侵权/违法违规/事实不符，请联系多彩编程网进行投诉反馈，一经查实，立即删除！