综合案例：简易版学生和老师管理系统（分层思想开发思想）

pojo类

public class Student {
    private String name;
    private int age;
    private String sub;

    public Student() {
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public String getSub() {
        return sub;
    }

    public void setSub(String sub) {
        this.sub = sub;
    }
}

public class Teacher {
    private String name;
    private int age;
    private String sub2;

    public Teacher() {
    }

    public Teacher(String name, int age, String sub2) {
        this.name = name;
        this.age = age;
        this.sub2 = sub2;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public String getSub2() {
        return sub2;
    }

    public void setSub2(String sub2) {
        this.sub2 = sub2;
    }
}

接口

public interface StudentService {
    Student insert();
    void findAll(Student[] tea,int index);
}

public interface TeacherService {
    Teacher insert();
    void findAll(Teacher[] tea,int index);
}

实现类

public class StudentServiceImpl implements StudentService {
    @Override
    public Student insert() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生的名称:");
        String name = scanner.next();
        System.out.println("请输入学生的年龄:");
        int age = scanner.nextInt();
        System.out.println("请输入学生所选的课程:");
        String sub = scanner.next();
        Student student = new Student(name,age,sub);
        return student;
    }

    @Override
    public void findAll(Student[] stu,int index) {
        System.out.println("学生的名称"+"\t"+"学生的年龄"+"\t"+"学生所选的课程");
        for (int i = 0; i < index; i++) {
            Student t=stu[i];
            System.out.println(t.getName()+"\t\t"+t.getAge()+"\t\t\t"+t.getSub());
        }
    }
}

public class TeacherServiceImpl implements TeacherService {
    @Override
    public Teacher insert() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入老师的名称:");
        String name = scanner.next();
        System.out.println("请输入老师的年龄:");
        int age = scanner.nextInt();
        System.out.println("请输入老师授课的课程:");
        String sub = scanner.next();
        Teacher teacher = new Teacher(name,age,sub);
        return teacher;
    }

    @Override
    public void findAll(Teacher[] tea,int index) {
        System.out.println("老师的名称"+"\t"+"老师的年龄"+"\t"+"老师授课的课程");
        for (int i = 0; i < index; i++) {
            Teacher t=tea[i];
            System.out.println(t.getName()+"\t\t"+t.getAge()+"\t\t\t"+t.getSub2());
        }
    }
}

测试类

public class MyTest {
    public static void main(String[] args) {
        System.out.println("欢迎使用学生管理系统");
        Scanner scanner = new Scanner(System.in);
        TeacherServiceImpl teacherService = new TeacherServiceImpl();
        StudentServiceImpl studentService = new StudentServiceImpl();
        Teacher[] tea = new Teacher[100];
        Student[] stu = new Student[100];
        int index =0;
        while (true){
            System.out.println("1.录入老师");
            System.out.println("2.录入学生");
            System.out.println("3.查看老师信息");
            System.out.println("4.查看学生信息");
            System.out.println("5.退出系统");
            int i = scanner.nextInt();
            switch (i){
                case 1:
                    Teacher teacher = teacherService.insert();
                    tea[index]=teacher;
                    index++;
                    break;
                case 2:
                    Student student = studentService.insert();
                    stu[index]=student;
                    index++;
                    break;
                case 3:
                    teacherService.findAll(tea,index);
                    break;
                case 4:
                    studentService.findAll(stu,index);
                    break;
                case 5:
                    System.out.println("感谢使用本系统");
                    return;
            }
        }
    }
}