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java使用lambda表達(dá)式多條件排序方式

更新時(shí)間：2023年09月04日 15:09:34 作者：完美明天cxp

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使用java的lambda表達(dá)式多條件排序

這里多條件是指同時(shí)生效

先把我的對象擺上

@Data
@AllArgsConstructor
@ToString
public class Student {
    private String name;
    private String age;
    private Integer id;
    private Integer score;
}

然后再準(zhǔn)備好排序的數(shù)據(jù)

List<Student> studentList = new ArrayList<>();
studentList.add(new Student("1", "222", 5, 8));
studentList.add(new Student("2", "111", 3, 9));
studentList.add(new Student("3", "224", 4, 6));
studentList.add(new Student("4", "333", 3, 11));
studentList.add(new Student("4", "444", 5, 6));
System.out.println(studentList);

這里的構(gòu)造按照實(shí)體里的屬性先后定的位置，1條件代表id，2條件代表score

有以下集中場景

System.out.println("例一--------------1升2升------------");
studentList = studentList.stream().sorted(Comparator.comparing(Student::getId).thenComparing(Student::getScore)).collect(Collectors.toList());
for (Student s : studentList) {
    System.out.println(s);
}
System.out.println("例二--------------1升2降------------");
studentList = studentList.stream().sorted(Comparator.comparing(Student::getId).reversed().thenComparing(Student::getScore).reversed()).collect(Collectors.toList());
for (Student s : studentList) {
    System.out.println(s);
}
System.out.println("例三--------------2降1升------------");
studentList = studentList.stream().sorted(Comparator.comparing(Student::getScore).reversed().thenComparing(Student::getId)).collect(Collectors.toList());
for (Student s : studentList) {
    System.out.println(s);
}
System.out.println("例四--------------1降2升------------");
studentList = studentList.stream().sorted(Comparator.comparing(Student::getId).reversed().thenComparing(Student::getScore)).collect(Collectors.toList());
for (Student s : studentList) {
    System.out.println(s);
}
System.out.println("例五--------------1降2降------------");
studentList = studentList.stream().sorted(Comparator.comparing(Student::getId).thenComparing(Student::getScore).reversed()).collect(Collectors.toList());
for (Student s : studentList) {
    System.out.println(s);
}

結(jié)果：

--------------1升2升------------
Student(name=2, age=111, id=3, score=9)
Student(name=4, age=333, id=3, score=11)
Student(name=3, age=224, id=4, score=6)
Student(name=4, age=444, id=5, score=6)
Student(name=1, age=222, id=5, score=8)
--------------1升2降------------
Student(name=4, age=333, id=3, score=11)
Student(name=2, age=111, id=3, score=9)
Student(name=3, age=224, id=4, score=6)
Student(name=1, age=222, id=5, score=8)
Student(name=4, age=444, id=5, score=6)
--------------2降1升------------
Student(name=4, age=333, id=3, score=11)
Student(name=2, age=111, id=3, score=9)
Student(name=1, age=222, id=5, score=8)
Student(name=3, age=224, id=4, score=6)
Student(name=4, age=444, id=5, score=6)
--------------1降2升------------
Student(name=4, age=444, id=5, score=6)
Student(name=1, age=222, id=5, score=8)
Student(name=3, age=224, id=4, score=6)
Student(name=2, age=111, id=3, score=9)
Student(name=4, age=333, id=3, score=11)
--------------1降2降------------
Student(name=1, age=222, id=5, score=8)
Student(name=4, age=444, id=5, score=6)
Student(name=3, age=224, id=4, score=6)
Student(name=4, age=333, id=3, score=11)
Student(name=2, age=111, id=3, score=9)