java第四章编程题（初学篇）

代码：

 1 /*

 2    test.java

 3 */

 4 package test;

 5 public class test {

 6     public static void main(String args[] )

 7     {

 8         CPU ccp= new CPU();

 9         HardDisk hhd=new HardDisk();

10         PC pc =new PC();

11         ccp.setSpeed(2200);

12         hhd.setAmount(200);

13         pc.setCPU(ccp);

14         pc.setHardDisk(hhd);

15         pc.show();

16     }

17

18 }

 1 /*

 2   PC.java

 3 */

 4 package test;

 5 public class PC {

 6     CPU cpu ;

 7     HardDisk HD ;

 8     void setCPU(CPU cp)  { cpu=cp;  }

 9     void setHardDisk(HardDisk hd){ HD=hd ;}

10     void show()

11     {

12         System.out.println("CPU的Speed: "+cpu.getSpeed());

13         System.out.println("HardDisk: "+HD.getAmount());

14     }

15 }

 1 /*

 2   CPU.java

 3 */

 4 package test;

 5

 6 public class CPU {

 7      int speed;

 8      void setSpeed(int m){speed=m;}

 9      int getSpeed(){return speed ;}

10 }

 1 /*

 2   HardDisk.java

 3 */

 4 package test;

 5

 6 public class HardDisk {

 7

 8     int amount;

 9     void setAmount(int m){    amount=m;}

10     int getAmount(){return amount;}

11 }

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