java程序编程：编写3个类

People、Student和主类；People类中有2个成员变量name和age，2个方法setName和show方法；Student类是People类的子类，包含1个成员变量department和一个方法setDepartment；主类中要求创建Student对象，调用以上3个方法并给参数赋值。

https://blog.csdn.net/weixin_43478250/article/details/101361396

class People {
private String name;
private String age;

public void setName(String name) {
    this.name = name;
}
public void show(String name,String age){
System.out.println("输出:" +name+","+age);    
}

public static void main(String[] args) {
    Student student=new Student();
    student.setName("li");
    student.setDepartment("销售");
    student.show("li","18");
}

}
class Student extends People{
private String department;
public void setDepartment(String department) {
this.department = department;
}
}

两个类的创建我就不写了，你在主类中People people = new Student();创建一个People的子类对象，剩下的直接调用方法及赋值就行