JAVA类和对象练习

 ①定义类Teacher,属性name,subject，行为teach，构造函数初始化两个属性。

 ②定义类Student，属性name,grade，行为study，构造函数初始化两个属性。

 ③定义类ClassRoom，属性Teacher，Student[],构造函数初始化两个属性，行为showMembers()输出教师和学生的名字

class Teacher {
    String name;
    String subject;

    public Teacher(String name, String subject) {
        this.name = name;
        this.subject = subject;
    }

    public String getName() {
        return name;
    }

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

    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public void teach() {
        System.out.println(this.name + " is teaching " + this.subject);
    }
}

class Student {
    String name;
    int grade;

    public String getName() {
        return name;
    }

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

    public int getGrade() {
        return grade;
    }

    public void setGrade(int grade) {
        this.grade = grade;
    }

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

    public void study() {
        System.out.println(this.name + " is studying in grade " + this.grade);
    }
}

class ClassRoom {
    Teacher teacher;
    Student[] students;

    public ClassRoom(Teacher teacher, Student[] students) {
        this.teacher = teacher;
        this.students = students;
    }

    public void showMembers() {
        System.out.print(this.teacher.getName()+",");
        int size = this.students.length;
        for (int i = 0; i < size; i++) {
            System.out.print(this.students[i].getName());
            if (i < size - 1) {
                System.out.print(",");
            }
        }
        System.out.println();
    }
}

public class Test {
    public static void main(String[] args) {
        Teacher teacher = new Teacher("Viktor Axelsen", "Badminton");
        Student[] students = new Student[2];
        students[0] = new Student("Shi Yuqi", 1);
        students[1] = new Student("Lee Zijia", 2);
        ClassRoom classRoom = new ClassRoom(teacher, students);
        classRoom.showMembers();
    }
}

注意下输出格式，可以按需更改。