jav定义一个学生类（Student），属性包括：学号，姓名，性别，年龄；方法包括：获得学号，获得姓名，获得性别，获得年龄，修改学号，修改姓名，修改性别，修改年龄。定义并创建一个学生数组对象，长度可自定，最后在控制台输出学生信息。设计程序进行测试。

public class Student {
    private String id;
    private String name;
    private String gender;
    private int age;

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

public class Main {
    public static void main(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("001", "张三", "男", 18);
        students[1] = new Student("002", "李四", "女", 19);
        students[2] = new Student("003", "王五", "男", 20);

        for (Student student : students) {
            System.out.println("学号：" + student.getId() + "，姓名：" + student.getName() + "，性别：" + student.getGender() + "，年龄：" + student.getAge());
        }
    }
}