CPU类要求getSpeed()返回speed的值，要求setSpeed(int m)方法将参数m的值赋值给speed。HardDisk类要求getAmount()返回amount的值，要求setAmount(int m)方法将参数m的值赋值给amount。PC类要求setCPU(CPU c)将参数c的值赋值给cpu，要求setHardDisk(HardDisk h)方法将参数h的值赋值给HD，要求show()方法能显示cpu的速度和硬盘的容量。(The UML diagrams associated with PC and CPU and HardDisk classes are as follows:
The CPU class requires getSpeed () to return the value of speed, and the setSpeed (int m) method to assign the value of the parameter m to speed. The HardDisk class requires getAmount () to return the value of amount, and requires the setAmount (int m) method to assign the value of parameter m to amount. The PC class requires the setCPU (CPU c) to assign the value of parameter C to the CPU, the setHardDisk (HardDisk h) method to assign the value of parameter h to HD, and the show () method to display the speed of the CPU and the capacity of the hard disk.)