用java 定义一个表示学生的类Student,包括属性“学号”、“班号”、“姓名”、“性别”、“年龄”;方法“获得学号”、“获得班号”、 “获得姓名”、“获得性别”、 “获得年龄”、 “修改年龄”。在main()中创建Student类对象,测试自定义类。

好的，以下是用Java定义一个表示学生的类Student的代码：

public class Student {
    private String studentId;
    private String classId;
    private String name;
    private String gender;
    private int age;

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

    public String getStudentId() {
        return studentId;
    }

    public String getClassId() {
        return classId;
    }

    public String getName() {
        return name;
    }

    public String getGender() {
        return gender;
    }

    public int getAge() {
        return age;
    }

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

在main()中创建Student类对象并测试：

public static void main(String[] args) {
    Student student = new Student("001", "ClassA", "Tom", "Male", 18);
    System.out.println("Student ID: " + student.getStudentId());
    System.out.println("Class ID: " + student.getClassId());
    System.out.println("Name: " + student.getName());
    System.out.println("Gender: " + student.getGender());
    System.out.println("Age: " + student.getAge());

    student.setAge(19);
    System.out.println("New Age: " + student.getAge());
}

输出结果为：

Student ID: 001
Class ID: ClassA
Name: Tom
Gender: Male
Age: 18
New Age: 19