编程题

public class CPU {      int speed;        public int getSpeed() {          return speed;      }        public void setSpeed(int speed) {          this.speed = speed;      }  }  public class HardDisk {      int amount;        public int getAmount() {          return amount;      }        public void setAmount(int amount) {          this.amount = amount;      }          }  public class PC {      CPU cpu;      HardDisk HD;      public CPU getCpu() {          return cpu;      }      public void setCpu(CPU cpu) {          this.cpu = cpu;      }      public HardDisk getHD() {          return HD;      }      public void setHD(HardDisk hD) {          this.HD = hD;      }      void Show() {          System.out.println("CPU频率"+cpu.getSpeed());          System.out.println("硬盘容量"+HD.getAmount());      }            }  package org.gerrysu.Test5;    public class Test {        public static void main(String[] args) {          // TODO Auto-generated method stub          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();        }    }