java 自定义排序
时间: 2023-11-10 08:03:02 浏览: 37
可以使用Java中的Comparator接口来自定义排序。Comparator接口包含一个compare方法,该方法用于比较两个对象的顺序。下面是一个示例代码,展示如何使用Comparator来自定义排序:
```java
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
class Student {
private String name;
private int age;
public Student(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
}
public class Main {
public static void main(String[] args) {
List<Student> students = new ArrayList<>();
students.add(new Student("Alice", 20));
students.add(new Student("Bob", 18));
students.add(new Student("Charlie", 22));
// 使用匿名内部类实现Comparator接口
Comparator<Student> ageComparator = new Comparator<Student>() {
@Override
public int compare(Student s1, Student s2) {
return s1.getAge() - s2.getAge();
}
};
// 根据年龄升序排序
Collections.sort(students, ageComparator);
for (Student student : students) {
System.out.println(student.getName() + " - " + student.getAge());
}
}
}
```
输出结果:
```
Bob - 18
Alice - 20
Charlie - 22
```