//课程类
public class Course {
    private String cname[]={"Java","PHP","JQuery","HTML","CSS","C++","MySQL","Oracle"};//课程名称

    public String[] getCname() {
        return cname;
    }

    public void setCname(String[] cname) {
        this.cname = cname;
    }
}

//学生类

public class Student {

    private String sno;//学号

    private String name;//姓名

    private String sex;//性别

    private String course[]=new String[3];//选课

    public Student(String sno,String name,String sex){

        this.setSno(sno);

        this.setName(name);

        this.setSex(sex);

    }
    public String getSno() {

        return sno;

    }
    public void setSno(String sno) {

        this.sno = sno;

    }
    public String getName() {

        return name;

    }
    public void setName(String name) {

        this.name = name;

    }
    public String getSex() {

        return sex;

    }

    public void setSex(String sex) {

        this.sex = sex;

    }

    public String[] getCourse() {

        return course;

    }

    public void setCourse(String[] c) {

        course = c;

    }

}

import java.util.Scanner;

public class StudentTest {

    public static void main(String[] args){

        int i=1;

        String[] st=new String[3];

        Course a=new Course();

        Student stu=new Student("123","lili","女");

        /**

         *  判断是否选择课程，如果是，则输入课程名称，如果否，则随机产生三门课程

         */

        System.out.println("************是否选择课程***********");

        Scanner sc=new Scanner(System.in);

        String s=sc.next();

        switch(s) {

            case "是":

                System.out.println("************请输入所选课程名称:***********");

                for (int n = 0; n < 3; n++) {

                    //生成随机数，工具类

                    Scanner sa = new Scanner(System.in);

                    String one = sa.next();

                    st[n] = one;

                }

                stu.setCourse(st);

                break;

            case "否":

                System.out.println("************随机选择课程:***********");

                for (int n = 0; n < 3; n++) {

                    int j = (int) (Math.random() * 7)+1;

                    String[] c=a.getCname();

                    //System.out.println(c[j]);

                    st[n]=c[j];

                }

                stu.setCourse(st);

                break;

        }

        /**

         * 输出学生信息

         */

        System.out.println("**************学生信息**************");

        System.out.println("学号:"+stu.getSno());

        System.out.println("姓名:"+stu.getName());

        System.out.println("性别:"+stu.getSex());

        String[] cou=stu.getCourse();

        System.out.print("所选课程:");

        for(int y=0;y<3;y++){

            System.out.print(cou[y]+"  ");

        }

    }

}