定义一个Person类，含姓名、性别、年龄等字段；

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定义一个Person类，含姓名、性别、年龄等字段；

定义一个Person类，含姓名、性别、年龄等字段；继承Person类设计Teacher类，增加职称、部门等字段；继承Person类设计Student类，增加学号、入学时间、专业等字段。定义各类的构造方法和toString（）方法，并分别创建对象进行测试。

源代码如下：

package pk1;
class Person{String name,gender;int age;public Person(String name,String gender,int age) {this.name=name;this.gender=gender;this.age=age;}//有参构造方法public Person(){this("","",0);}//无参构造方法public String toString() {return "姓名："+name+"性别："+gender+"年龄"+age;}public static void main(String[] args) {// TODO Auto-generated method stubPerson P=new Person("李华","男",23);System.out.println(P);}
}
public class Teacher extends Person {String post,branch;public Teacher(String name,String gender,int age,String post,String branch) {super(name,gender,age);this.post=post;this.branch=branch;}public String toString() {return super.toString()+"职称："+post+"部门："+branch;}public static void main(String[] args) {// TODO Auto-generated method stubTeacher T=new Teacher("楚人美","女",25,"高级","戏曲");System.out.println(T);}
}
class Student extends Person{String num,date,major;public Student(String name,String gender,int age,String num,String date,String major) {super(name,gender,age);this.num=num;this.date=date;this.major=major;}public String toString() {return super.toString()+"学号："+num+"入学日期："+date+"专业："+major;}public static void main(String[] args) {// TODO Auto-generated method stubStudent S=new Student("李强","男",8,"321","1988.9.1","生物");System.out.println(S);}
}