Person及其子类

package cn.exp;//都是比较常见和标准的写法。注意eclipse工具的使用。class AgeException extends RuntimeException{  public AgeException(String Message) {           super(Message);  }}class Person{String name;String gender;int age;public Person(String name, String gender, int age) {//super();if(age<=0){throw new AgeException("年龄错误，请重新输入");}this.name = name;this.gender = gender;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Person [name=" + name + ", gender=" + gender + ", age=" + age+ "]";}}class Student extends Person{int id;public Student(String name, String gender, int age, int id) {super(name, gender, age);if(age<=0){throw new AgeException("年龄错误，请重新输入");}this.id = id;}public int getId() {return id;}public void setId(int id) {this.id = id;}@Overridepublic String toString() {return "Student [name=" + name + ", gender=" + gender + ", age=" + age+ ",id="+id+"]";}public void show(){System.out.println("学生爱学习");}}class Teacher extends Person{int pid;public Teacher(String name, String gender, int age, int pid) {super(name, gender, age);if(age<=0){throw new AgeException("年龄错误，请重新输入");}this.pid = pid;}public int getPid() {return pid;}public void setPid(int pid) {this.pid = pid;}public String toString(){return "Teacher [name=" + name + ", gender=" + gender + ", age=" + age+ ",pid="+pid+"]";}public void show(){System.out.println("老师爱吃饭");}}public class PersonTest1 {        public static void main(String[] args) {Student student=new Student("小米", "女", 12, 77);student.show();System.out.println(student.toString());Teacher teacher=new Teacher("小兰", "男", 77, 88);teacher.show();System.out.println(teacher.toString());}}