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;
	}
	@Override
	public 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;
	}
	@Override
	public 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());
		}
}