用类描述计算机中CPU的速度和硬盘的容量，要求Java应用程序有4个类，名字分别为：pc CPU harddisk 和Test ，其中TEST是主类。

CPU类：

public class CPU {

int speed;
void setSpeed(int m) {
speed=m;
}
public int getSpeed() {
return speed;
}

}

pc类：

public class PC {
CPU cpu;
HardDisk HD;

public void setCPU(CPU c) {
cpu =c;
}
public void setHardDisk(HardDisk h) {
HD=h;
}
public void show() {
System.out.println("cpu的速度："+cpu.getSpeed()+
"硬盘的容量："+HD.getAmount());
}
}

HardDISK类：

public class HardDisk {
int amount;
void setAmount(int m) {
amount=m;
}
public int getAmount() {
return amount;
}
}

Test类：

public class TestComputer {


public static void main(String[] args) {
// TODO Auto-generated method stub
CPU cpu =new CPU ();
cpu.speed=100;
HardDisk hardDisk =new HardDisk();
hardDisk.amount=100000000;
PC pc=new PC();
pc.setCPU(cpu);
pc.setHardDisk(hardDisk);
pc.show();

}


}

结果：