在JAVA中利用Arraylist输入一个学生的姓名，学号，成绩，其中姓名和学号为字符串，成绩为int

可以按照以下步骤实现：

1. 首先需要导入ArrayList类，代码如下：

import java.util.ArrayList;

2. 然后定义一个Student类，包含姓名、学号和成绩三个属性，代码如下：

class Student {
    private String name;
    private String id;
    private int score;

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

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public int getScore() {
        return score;
    }
}

3. 接着创建一个ArrayList对象，用来存放学生信息，代码如下：

ArrayList<Student> studentList = new ArrayList<Student>();

4. 然后通过Scanner类从控制台输入学生信息，并将其添加到ArrayList中，代码如下：

Scanner scanner = new Scanner(System.in);

System.out.println("请输入学生姓名、学号、成绩：");
String name = scanner.next();
String id = scanner.next();
int score = scanner.nextInt();

Student student = new Student(name, id, score);
studentList.add(student);

5. 最后可以遍历ArrayList，输出学生信息，代码如下：

for (Student s : studentList) {
    System.out.println("姓名：" + s.getName() + "，学号：" + s.getId() + "，成绩：" + s.getScore());
}

完整代码如下：

import java.util.ArrayList;
import java.util.Scanner;

class Student {
    private String name;
    private String id;
    private int score;

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

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public int getScore() {
        return score;
    }
}

public class Main {
    public static void main(String[] args) {
        ArrayList<Student> studentList = new ArrayList<Student>();

        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入学生姓名、学号、成绩：");
        String name = scanner.next();
        String id = scanner.next();
        int score = scanner.nextInt();

        Student student = new Student(name, id, score);
        studentList.add(student);

        for (Student s : studentList) {
            System.out.println("姓名：" + s.getName() + "，学号：" + s.getId() + "，成绩：" + s.getScore());
        }
    }
}