用java先从键盘录入5个学生的数据，保存到容器对象ar中，然后按照名字升序排序之后输出。

好的，以下是Java代码实现：

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

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<Student> ar = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            System.out.println("请输入第" + (i + 1) + "个学生的姓名和成绩：");
            String name = scanner.next();
            int score = scanner.nextInt();
            ar.add(new Student(name, score));
        }
        Collections.sort(ar, new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                return o1.getName().compareTo(o2.getName());
            }
        });
        System.out.println("按照名字升序排序后的结果为：");
        for (Student student : ar) {
            System.out.println(student.getName() + " " + student.getScore());
        }
    }
}

class Student {
    private String name;
    private int score;

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

    public String getName() {
        return name;
    }

    public int getScore() {
        return score;
    }
}

希望能够帮到您！