JAVA程序编程题Java期末复习

1.编写Java应用程序，要求有3个类：CPU，PC，Test。要求：（1）CPU类有成员变量speed表示CPU的运行速度，有方法setSpeed(intm)设置运行速度，getSpeed()获取运行速度；（2）PC类有成员变量CPU，方法setCPU(CPUc)设置CPU，show()显示CPU的运行速度；（3）Test类为主类，main方法中创建一个CPU对象和一个PC对象，并调用setCPU(CPUc)设置CPU，调用show()方法显示CPU的运行速度。classCPU{intspeed;intgetSpeed(){returnspeed;}voidsetSpeed(intspeed){this.speed=speed;}}publicclassPC{CPUcpu;voidsetCPU(CPUcpu){this.cpu=cpu;}voidshow(){System.out.println(cpu速度：+cpu.getSpeed());}}classTest{publicstaticvoidmain(Stringargs[]){CPUcpu=newCPU();cpu.setSpeed(2000);PCpc=newPC();pc.setCPU(cpu);pc.show();}}2.编写Java应用程序，要求有4个类：Animal，Dog，Cat，Simulator。其中：（1）Animal为抽象类，有2个抽象方法cry()和getName()，具体动物可以给出自己的叫声及名称；（2）Dog和Cat类，为Animail的实现类；（3）Simulator类为测试类，该类包含1个main方法和1个playSound(Animalanimal)方法，在main方法中调用playSound方法模拟Dog和Cat的叫声publicabstractclassAnimal{publicabstractvoidcry();publicabstractStringgetAnimalName();}classDogextendsAnimal{publicvoidcry(){System.out.println(汪汪···汪汪);}publicStringgetAnimalName(){return狗;}}classCatextendsAnimal{publicvoidcry(){System.out.println(喵喵···喵喵);}publicStringgetAnimalName(){return猫;}}classSimulator{publicvoidplaySound(Animalanimal){System.out.print(现在播放+animal.getAnimalName()+类的声音：);animal.cry();}publicstaticvoidmain(Stringargs[]){Simulatorsimulator=newSimulator();simulator.playSound(newDog());simulator.playSound(newCat());}}6.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是主类。publicclassTest{publicstaticvoidmain(String[]args){CPUcpu=newCPU();cpu.setspeed(2200);HardDiskdisk=newHardDisk();disk.setamount(200);PCpc=newPC();pc.setCPU（cpu);pc.setHardDisk(disk);pc.show();}}classCPU{privateintspeed;CPU(){}voidsetspeed(intm){this.speed=m;}intgetspeed(){returnthis.speed;}}classHardDisk{privateintamount;HardDisk（）{}voidsetamount(intm){this.amount=m;}intgetamount(){returnthis.amount;}}classPC{privateCPUcpu;privateHardDiskHD;PC(){}voidsetCPU(CPUc){this.HD=h;}voidshow(){System.out.println(cpuspeedis”+this.cpu.getspeed()+HardDiskamountis+this.HD.getamount());}}补充1.编程计算8+88+888+8888---的前12项和。PublicclassTest{Publicstaticvoidmain(Stringargs[]){Longsum=0,a=8,item=a,n=12,i=1;For(i=1;Ii=n;i++){sum=sum+item;Item=item*10+a;}System.out.println(sum);}}2.用while语言编程计算1+1\2!+1\3!+1\4!---------的前20项和PublicclassText{Publicstaticvoidmain(stringargs[]){doublesum=0,a=1;Inti=1;While(i=20){Sum=sum+a;i=i+1;a=a*(1\i);}System.out.println(sum);}}