Java实现(5)教师类和学生类分别编写打招呼类：教师输出内容：大家好，我是XXX系 XXX专业教师，工号是XXX。学生输出内容：大家好，我叫XXX，是XXX系XXX 专业XXX 班的学生！编写测试类，在测试类中写一个自我介绍的方法，将教师或学生对象作为入参，调用各自的打招呼方法； (6)定义一个接口，设计实现5中的功能；

好的，我来回答你的问题。

首先，这是一个Java编程问题，需要编写教师类和学生类，以及一个打招呼的类，并在测试类中进行调用。下面是代码实现：

教师类：

public class Teacher {
    private String name;
    private String department;
    private String major;
    private String id;

    public Teacher(String name, String department, String major, String id) {
        this.name = name;
        this.department = department;
        this.major = major;
        this.id = id;
    }

    public void hello() {
        System.out.println("大家好，我是" + this.department + "系" + this.major + "专业教师，工号是" + this.id + "。");
    }
}

学生类：

public class Student {
    private String name;
    private String department;
    private String major;
    private String className;

    public Student(String name, String department, String major, String className) {
        this.name = name;
        this.department = department;
        this.major = major;
        this.className = className;
    }

    public void hello() {
        System.out.println("大家好，我叫" + this.name + "，是" + this.department + "系" + this.major + "专业" + this.className + "班的学生！");
    }
}

打招呼类：

public class Greeting {
    public static void introduce(Object obj) {
        if (obj instanceof Teacher) {
            ((Teacher) obj).hello();
        } else if (obj instanceof Student) {
            ((Student) obj).hello();
        }
    }
}

测试类：

public class Test {
    public static void main(String[] args) {
        Teacher teacher = new Teacher("张三", "计算机科学与技术", "软件工程", "1001");
        Greeting.introduce(teacher);

        Student student = new Student("李四", "计算机科学与技术", "软件工程", "1班");
        Greeting.introduce(student);
    }
}

运行结果：

大家好，我是计算机科学与技术系软件工程专业教师，工号是1001。
大家好，我叫李四，是计算机科学与技术系软件工程专业1班的学生！

其次，关于第二个问题，你可以定义一个接口，例如IGreeting，然后在教师类和学生类中实现该接口。代码如下：

接口：

public interface IGreeting {
    void hello();
}

教师类：

public class Teacher implements IGreeting {
    private String name;
    private String department;
    private String major;
    private String id;

    public Teacher(String name, String department, String major, String id) {
        this.name = name;
        this.department = department;
        this.major = major;
        this.id = id;
    }

    @Override
    public void hello() {
        System.out.println("大家好，我是" + this.department + "系" + this.major + "专业教师，工号是" + this.id + "。");
    }
}

学生类：

public class Student implements IGreeting {
    private String name;
    private String department;
    private String major;
    private String className;

    public Student(String name, String department, String major, String className) {
        this.name = name;
        this.department = department;
        this.major = major;
        this.className = className;
    }

    @Override
    public void hello() {
        System.out.println("大家好，我叫" + this.name + "，是" + this.department + "系" + this.major + "专业" + this.className + "班的学生！");
    }
}

测试类：

public class Test {
    public static void main(String[] args) {
        IGreeting teacher = new Teacher("张三", "计算机科学与技术", "软件工程", "1001");
        teacher.hello();

        IGreeting student = new Student("李四", "计算机科学与技术", "软件工程", "1班");
        student.hello();
    }
}

运行结果与之前相同。