用类描述计算机中的CPU的速度和磁盘的容量

package jisuanji;public class PC { CPU cpu;   HardDisk HD;         public void setCpu(CPU cpu) {       this.cpu = cpu;  }  public void setHD(HardDisk hD) {       HD = hD;  }  void show()  {    System.out.println("cpu速度："+cpu.speed+"硬盘容量："+HD.amount);  }         }package jisuanji;public class CPU { int speed;       public int getSpeed() {      return speed;   }   public void setSpeed(int speed) {      this.speed = speed;   }  }package jisuanji;public class HardDisk {int amount;  public int getAmount() {      return amount;  }  public void setAmount(int amount) {      this.amount = amount;  }  }package jisuanji;public class Test { public static void main(String[] args) {    CPU cpu=new CPU();    cpu.setSpeed(2200);    HardDisk  disk= new HardDisk();    disk.setAmount(200);    PC pc = new PC();    pc.setCpu(cpu);    pc.setHD(disk);    pc.show();      }  }