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，名字分别是PC、CPU、HardDisk和Test，其中Test是主类。

 　　PC类与CPU和HardDisk类关联的UML图如下：

　　其中，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。

 　　主类Test的要求

（1）　　main方法中创建一个CPU对象cpu，cpu将自己的speed设置为2200；

（2）　　main方法中创建一个HardDisk对象disk，disk将自己的amount设置为200；

（3）　　main方法中创建一个PC对象pc；

（4）　　pc调用setCPU(CPU c)方法，调用时实参是cpu；

（5）　　pc调用setHardDisk(HardDisk h)方法，调用时实参是disk

（6）　　pc调用show()方法。-With class describes the computer CPU speed and hard drive capacity. Requirements Java application has four categories, names are PC, CPU, HardDisk and Test, where Test is the main class. 　PC with UML class diagram CPU and HardDisk class association as follows: where, CPU type requires getSpeed ​ ​ () Returns the value of the speed, requiring setSpeed ​ ​ (int m) method of the value of the parameter m is assigned to speed. HardDisk class requires getAmount () Returns the value of the amount of required setAmount (int m) method parameter m is assigned to amount. PC class requires setCPU (CPU c) the value of the parameter c is assigned to cpu, requires setHardDisk (HardDisk h) method parameter values ​ ​ h is assigned to HD, requirements show () method can show cpu speed and hard drive capacity. Requirements 　main class Test of (1) main method to create a CPU target cpu, cpu own speed is set to 2200　(2) main method to create a HardDisk targe