手动编译java的package问题，及演示继承的基本实现

不用IDE，而直接用命令编译JAVA包，仔细看了下，作一个记录。

以下的URL值得收藏。

http://www.aiuxian.com/article/p-2115485.html

http://www.cnblogs.com/haolujun/archive/2013/03/02/2939698.html

http://blog.sina.com.cn/s/blog_533074eb01014yd7.html

主要要理解classpath参数,d参数，及.作路径导向。

演示继承的四个文件如下：

Role.java

package cc.openhome;

public class Role {
  private String name;
  private int level;
  private int blood;

  public int getBlood() {
    return blood;
  }

  public void setBlood(int blood) {
    this.blood = blood;
  }

  public int getLevel() {
    return level;
  }

  public void setLevel(int level) {
    this.level = level;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}

SwordsMan.java

package cc.openhome;

public class SwordsMan extends Role {
  public void fight() {
    System.out.println("Attack with swords");
  }
}

Magician.java

package cc.openhome;

public class Magician extends Role {
  public void fight() {
    System.out.println("Attack with magician");
  }
}

RPG.java

package cc.openhome;

public class RPG {
  public static void main(String[] args) {
    SwordsMan swordsMan = new SwordsMan();
    swordsMan.setName("Justin");
    swordsMan.setLevel(1);
    swordsMan.setBlood(200);
    System.out.printf("SwordsMan: (%s, %d, %d)%n", swordsMan.getName(),
                swordsMan.getLevel(), swordsMan.getBlood());

    Magician magician = new Magician();
    magician.setName("Monica");
    magician.setLevel(2);
    magician.setBlood(100);
    System.out.printf("Magician: (%s, %d, %d)%n", magician.getName(),
                                magician.getLevel(), magician.getBlood());
  }
}

目录结构平铺如下：

手动编译命令及执行顺序如下：

D:\learn>javac -cp . -d . Role.java

D:\learn>javac -cp . -d . SwordsMan.java

D:\learn>javac -cp . -d . Magician.java

D:\learn>javac -cp . -d . Role.java

D:\learn>javac -cp . -d . RPG.java

D:\learn>java -cp . cc.openhome.RPG
SwordsMan: (Justin, 1, 200)
Magician: (Monica, 2, 100)