吴裕雄--天生自然 JAVA开发学习：包(package)

package pkg1[．pkg2[．pkg3…]];

package net.java.util;
public class Something{
   ...
}

package animals;
 
interface Animal {
   public void eat();
   public void travel();
}

package animals;
 
/* 文件名 : MammalInt.java */
public class MammalInt implements Animal{
 
   public void eat(){
      System.out.println("Mammal eats");
   }
 
   public void travel(){
      System.out.println("Mammal travels");
   } 
 
   public int noOfLegs(){
      return 0;
   }
 
   public static void main(String args[]){
      MammalInt m = new MammalInt();
      m.eat();
      m.travel();
   }
}

import package1[.package2…].(classname|*);

package payroll;
 
public class Boss
{
   public void payEmployee(Employee e)
   {
      e.mailCheck();
   }
}

package vehicle;
 
public class Car {
   // 类实现  
}

package com.runoob.test;
public class Runoob {
      
}
class Google {
      
}