包Package（书p53 例4.16和4.17）

 1 package Tryaaaaa;
 2 
 3 class FighterPlane {
 4     String name;
 5     int missileNum;
 6     void fire(){
 7         if(missileNum>0) {
 8             System.out.println ("now fire a missile!");
 9             missileNum -= 1;
10         }
11         else{
12             System.out.println("No missile left!");
13         }
14     }
15 }
16 
17 public class RunPlane {
18     public static void main(String args[]){
19         FighterPlane fp = new FighterPlane();
20         fp.name="苏35";
21         fp.missileNum=6;
22         fp.fire();
23     }
24 }

 1 package myjava.com.resource;
 2 
 3 public class FighterPlane {
 4     public String name;
 5     public int missileNum;
 6     public void fire(){
 7         if(missileNum>0) {
 8             System.out.println ("now fire a missile!");
 9             missileNum -= 1;
10         }
11         else{
12             System.out.println("No missile left!");
13         }
14     }
15 }

 1 package myjava.deliver.com.run;
 2 import myjava.com.resource.*;
 3 
 4 public class RunPlane {
 5     public static void main(String args[]){
 6         FighterPlane fp = new FighterPlane();
 7         fp.name="苏35";
 8         fp.missileNum=6;
 9         fp.fire();
10     }
11 }