1.机器人设计

设计一种机器人，可以移动，变形。机器人有控制芯片，可以更换，并且根据机器人内部的芯片，更改行为方式，比如移动方式有步行，跑步等，变形可以变成汽车，飞机等。

要求：

1、给出面向对象的设计（类图）；

2、给出Java代码实现。

interface ControlChip{void move(); //控制芯片接口void transform();
}
class Robot{//机器人类ControlChip controlChip;public Robot(ControlChip controlChip){this.controlChip=controlChip; //构造方法}public void move(){controlChip.move(); //控制芯片对应的移动方法}public void transform(){controlChip.transform();}
}
class WalkControlChip implements ControlChip{//步行芯片@Overridepublic void move() {System.out.println("步行。。。");}@Overridepublic void transform() {System.out.println("变形");}
}
class RunningControlChip implements ControlChip{//跑步芯片@Overridepublic void move() {System.out.println("跑步。。。");}@Overridepublic void transform() {System.out.println("变形");}
}
class CarControlChip implements ControlChip{//汽车芯片@Overridepublic void move() {System.out.println("移动");}@Overridepublic void transform() {System.out.println("汽车变形");}
}
class AirPlaneControlChip implements ControlChip{//飞机芯片@Overridepublic void move() {System.out.println("移动");}@Overridepublic void transform() {System.out.println("飞机变形");}
}
public class RobotTest {public static void main(String[] args) {WalkControlChip w=new WalkControlChip();RunningControlChip r=new RunningControlChip();CarControlChip c=new CarControlChip();AirPlaneControlChip a=new AirPlaneControlChip();Robot r1=new Robot(w);r1.move();r1.transform();Robot r2=new Robot(c);r2.move();r2.transform();}
}

2.智能形状识别器

设计一种智能形状识别器，能够识别出具体形状并输出相关信息。如传入圆形对象，则识别器则输出圆形、半径与面积等信息；传入矩形对象，能输出矩形、面积、长宽信息。

程序中识别功能不能使用if语句进行形状判断。

要求：

    1、给出面向对象的设计（类图）；

    2、给出Java代码实现。

import java.util.List;interface Shape{double calculateArea();//形状接口，抽象出求面积方法
}
class Circle implements Shape{//圆类double radius;double area; //面积public Circle(double radius){this.radius=radius;}@Overridepublic double calculateArea() {return Math.PI*radius*radius;}public double getRadius(){return this.radius;}}
class Rect implements Shape{//矩形类double length;double width;public Rect(double length,double width){this.length=length;this.width=width;}@Overridepublic double calculateArea(){return length*width;}public double getLength(){return length;}public double getWidth(){return width;}
}
class Recognize{//识别器类Shape shape; //形状public Recognize(Shape shape){this.shape=shape;double area=shape.calculateArea();if(shape instanceof Circle){//判断是圆Circle circle=(Circle) shape; //向下转换System.out.println("Shape: Circle");System.out.println("Circle Radius:"+circle.getRadius());System.out.println("Circl Areae:"+area);}else if(shape instanceof Rect){Rect rect=(Rect) shape;System.out.println("Shape: Rect");System.out.println("Rect Length:"+rect.getLength());System.out.println("Rect Width:"+rect.getWidth());System.out.println("Rect Area:"+area);}}}
public class RecognizerTest {public static void main(String[] args) {Circle circle=new Circle(10);Rect rect=new Rect(6,8);Recognize recognize1=new Recognize(circle);Recognize recognize2=new Recognize(rect);}
}

3.狗嗅+狗咬人

狗有多种嗅的功能，嗅到骨头流口水，嗅到老虎吓得跑，嗅到主人很高兴。

人有生命值（假设100），所有的狗都会咬人，藏獒（或泰迪）攻击一次可减少50（或1）个生命值。我先后养了藏獒、泰迪，都取了相同的宠物名-小黄。

结构小黄都咬人了。

要求：

    1、给出面向对象的设计（类图）；

    2、给出Java代码实现。

class Person{//人类int health=100;private Dog dog;public int getHealth(){return health;}public void setDog(Dog dog) {this.dog = dog;}public void setHealth(int health){this.health=health;}
}
class  Dog{String name;public void sniff(Object object){if(object instanceof Bone){System.out.println(name+"嗅到骨头流口水");}else if(object instanceof Tiger){System.out.println(name+"嗅到老虎吓得跑");}else if(object instanceof Person){System.out.println(name+"嗅到主人很高兴");}}public void bite(Person person){System.out.println(name+"咬人");}
}
class Bone{}
class Tiger{}
class Tibetan extends Dog{public Tibetan(String name){this.name=name;}@Overridepublic void bite(Person person){person.setHealth(person.getHealth()-50);System.out.println(name+"咬人了");}
}
class Teddy extends Dog{public Teddy(String name){this.name=name;}@Overridepublic void bite(Person person){person.setHealth(person.getHealth()-1);System.out.println(name+"咬人了");}
}
public class DogTest {public static void main(String[] args) {Person p=new Person();Tibetan t1=new Tibetan("小黄1");Teddy t2=new Teddy("小黄2");Bone b=new Bone();p.setDog(t1);t1.sniff(b);t1.bite(p);System.out.println(p.getHealth());p.setDog(t2);t2.sniff(b);t2.bite(p);System.out.println(p.getHealth());}
}

4.银行账户攻防

假定银行账户能够提供存款、取款和查询余额操作。

系统受到黑客攻击，设计出一种程序，将取款多少变成存款多少。请实现上述要求。

要求：

    1、给出面向对象的设计（类图）；

    2、给出Java代码实现。

class BankAccount{private double balance;public  BankAccount(double balance){this.balance=balance; //原有多少钱}public void deposit(double money){this.balance=balance+money;}public void withdraw(double money){deposit(money);} //取款变成存款public double getBalance(){return balance;}
}
public class BankTest {public static void main(String[] args) {BankAccount bankAccount=new BankAccount(1400);System.out.println(bankAccount.getBalance());bankAccount.deposit(400);System.out.println(bankAccount.getBalance());bankAccount.withdraw(500);System.out.println(bankAccount.getBalance());}
}