Java包

package people;//表明包people

 

//注意 import包得在 package包下

public class Person{

public String name;

public int age;

public char sex;

public void speeking() {

System.out.println("你好");

}

}

 

package people.school;//表明包people.school

import people.Person;//引入包people下的类

class Student1 extends Person

{

 public Student1 (String name,int age,char sex)

 {

 this.name=name;

 this.age=age;

 this.sex=sex;

 }

 public void speeking()

 {

 super.speeking();

 System.out.println("My name is"+name);

 System.out.println("My age is"+age);

 System.out.println("My sex is"+sex);

 }

}

 

 

 

 

public class Student {

public static void main(String [] args) {

Student1 s=new Student1("ni hao",21,'n');

s.speeking();

}

}

package people.school;表明包people.school

import people.Person;////引入包people下的类

 

class Teacher1 extends Person{

public Teacher1(String name,int age,char sex) {

this.name=name;

this.age=age;

this.sex=sex;

}

public void speeking() {

super.speeking();

 System.out.println("My name is"+name);

 System.out.println("My age is"+age);

 System.out.println("My sex is"+sex);

}

}

 

 

package people.school;//表明包people.school

 

import people.school.*;//引入包people.school下的所有类

 

class Test {

 

public static void main(String[] args) {

// TODO Auto-generated method stub

Student1 s=new Student1("ni hao",21,'n');

s.speeking();

Teacher1 t=new Teacher1("chengtt",22,'n');

t.speeking();

}

 

}

你好
My name isni hao
My age is21
My sex isn
你好
My name ischengtt
My age is22
My sex isn