java学生管理系统代码

这里提供一个简单的Java学生管理系统的代码示例，仅供参考：

import java.util.*;

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

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

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public int getAge() {
        return age;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    public String toString() {
        return "姓名：" + name + "，学号：" + id + "，年龄：" + age + "，成绩：" + score;
    }
}

public class StudentManagementSystem {
    private List<Student> students = new ArrayList<Student>();

    public void addStudent(Student student) {
        students.add(student);
    }

    public void removeStudent(Student student) {
        students.remove(student);
    }

    public void removeStudentById(String id) {
        Student stu = null;
        for (Student student : students) {
            if (student.getId().equals(id)) {
                stu = student;
                break;
            }
        }
        if (stu != null) {
            students.remove(stu);
        }
    }

    public Student getStudentById(String id) {
        Student stu = null;
        for (Student student : students) {
            if (student.getId().equals(id)) {
                stu = student;
                break;
            }
        }
        return stu;
    }

    public List<Student> getAllStudents() {
        return students;
    }

    public static void main(String[] args) {
        StudentManagementSystem system = new StudentManagementSystem();

        Student stu1 = new Student("张三", "1001", 20, 85);
        Student stu2 = new Student("李四", "1002", 21, 90);
        Student stu3 = new Student("王五", "1003", 22, 80);

        system.addStudent(stu1);
        system.addStudent(stu2);
        system.addStudent(stu3);

        List<Student> list = system.getAllStudents();
        System.out.println("所有学生信息：");
        for (Student student : list) {
            System.out.println(student);
        }

        Student stu4 = new Student("赵六", "1004", 23, 95);
        system.addStudent(stu4);
        System.out.println("添加一个新学生：" + stu4);

        system.removeStudent(stu1);
        System.out.println("删除一个学生：" + stu1);

        Student stu5 = system.getStudentById("1003");
        System.out.println("查找学号为1003的学生：" + stu5);

        system.removeStudentById("1002");
        System.out.println("删除学号为1002的学生");

        list = system.getAllStudents();
        System.out.println("所有学生信息：");
        for (Student student : list) {
            System.out.println(student);
        }
    }
}

这个示例中，定义了一个`Student`类，包含学生的姓名、学号、年龄和成绩等属性，并提供基本的访问和修改方法。另外，还有一个`StudentManagementSystem`类，包含添加、删除、查找和获取所有学生信息等方法。

在`main`方法中，首先创建了三个学生对象，并添加到学生管理系统中。然后输出所有学生信息，并添加了一个新的学生对象。接着删除了一个学生对象，并查找并输出了一个学生对象。最后，删除了一个学生对象，并输出了所有学生信息。