对LIST对象多个字段进行排序

最新推荐文章于 2025-05-21 12:29:56 发布

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最新推荐文章于 2025-05-21 12:29:56 发布

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本文介绍如何使用 Java 8 的 Stream API 对包含学生姓名、年龄及生日的列表进行复合排序。示例代码展示了如何实现按年龄升序、姓名不区分大小写的降序及生日降序的排序规则。

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jdk1.8之前的做法

参考: http://blog.youkuaiyun.com/enable1234___/article/details/53224740

jdk1.8新特性的做法：

参考: http://blog.youkuaiyun.com/aitangyong/article/details/54880228

Student.java

public class Student {
	private Long id;
	private String name;
	private String age;
	private Date birthday;

	public Student() {
	}

	public Student(Long id, String name, String age) {
		this.id = id;
		this.name = name;
		this.age = age;
	}

	public Student(String name, String age) {
		this.name = name;
		this.age = age;
	}

	public Student(String name, String age, Date birthday) {
		this.name = name;
		this.age = age;
		this.birthday = birthday;
	}

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

	public Date getBirthday() {
		return birthday;
	}

	public String getBirthdayStr() {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		return sdf.format(birthday);
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	@Override
	public String toString() {
		return "Student [name=" + name + ", age=" + age + ", birthday=" + getBirthdayStr() + "]";
	}
}

Listtest.java

public class ListTest {
	@Test
	public void test() {
		List<Student> stuList = new ArrayList<Student>();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
		stuList.add(new Student("wang", "18", sdf.parse("2007/04/01")));
		stuList.add(new Student("li", "19", sdf.parse("2007/05/01")));
		stuList.add(new Student("liu", "20", sdf.parse("2006/04/01")));
		stuList.add(new Student("xi", "15", sdf.parse("2007/04/01")));
		stuList.add(new Student("li", "17", sdf.parse("2007/05/01")));
		stuList.add(new Student("wang", "19", sdf.parse("2007/06/01")));

		// age升序
		Comparator<Student> byIdASC = Comparator.comparing(Student::getAge);

		// named不分区大小写降序
		Comparator<Student> byNameDESC = Comparator.comparing(Student::getName, String.CASE_INSENSITIVE_ORDER)
				.reversed();

		// birthday 降序
		Comparator<Student> byBirthdayDESC = Comparator.comparing(Student::getBirthday).reversed();

		// 联合排序
		Comparator<Student> finalComparator = byIdASC.thenComparing(byNameDESC).thenComparing(byBirthdayDESC);

		List<Student> result = stuList.stream().sorted(finalComparator).collect(Collectors.toList());
		print(result);
		// 输出结果:
		// Student [name=xi, age=15, birthday=2007-04-01]
		// Student [name=li, age=17, birthday=2007-05-01]
		// Student [name=wang, age=18, birthday=2007-04-01]
		// Student [name=wang, age=19, birthday=2007-06-01]
		// Student [name=li, age=19, birthday=2007-05-01]
		// Student [name=liu, age=20, birthday=2006-04-01]

	}
}