java定义一个含学生学号、姓名和成绩的类Student，进行升序排列并输出排序后的结果。

以下是Java代码实现：

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class Student {
    private String id; // 学号
    private String name; // 姓名
    private double score; // 成绩

    public Student(String id, String name, double score) {
        this.id = id;
        this.name = name;
        this.score = score;
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public double getScore() {
        return score;
    }

    public static void main(String[] args) {
        ArrayList<Student> students = new ArrayList<Student>();
        students.add(new Student("1001", "张三", 89.5));
        students.add(new Student("1002", "李四", 78.5));
        students.add(new Student("1003", "王五", 92.0));
        students.add(new Student("1004", "赵六", 85.5));

        Collections.sort(students, new Comparator<Student>() {
            public int compare(Student s1, Student s2) {
                if (s1.getScore() < s2.getScore())
                    return -1;
                else if (s1.getScore() > s2.getScore())
                    return 1;
                else
                    return 0;
            }
        });

        for (Student s : students) {
            System.out.println(s.getId() + " " + s.getName() + " " + s.getScore());
        }
    }
}

运行结果：

1002 李四 78.5
1004 赵六 85.5
1001 张三 89.5
1003 王五 92.0