对象的应用编程.docx

对象的应用编程实验目的：1 掌握对象的生成机制2.了解构造函数的作用实验内容1. 对象创建和使用。2. 使用关联类进行属性的定义。3. 访问控制修饰符的作用。4. 掌握静态属性、方法和初始化器的特点。5. 包的应用实验步骤1. 写一个名为Rectangle的类表示矩形。其属性包括宽width、高height和颜色color，width和height都是double型的，而color则是String类型的。要求该类提供计算面积的方法getArea()方法，以及修改width和height的值及获得width和height当前值的方法。要求：(1) 使用构造函数完成各属性的初始赋值(2) 使用getter和sr的形式完成属性的访问及修改public class Rectangle private double width;private double height;private String color; public Rectangle(double width, double height, String color) this.width = width;this.height = height;this.color = color;public double getWidth() return width;public void setWidth(double width) this.width = width;public double getHeight() return height;public void setHeight(double height) this.height = height;public double getArea()double area;return area=width*height;public static void main(String args) Rectangle a=new Rectangle(2.0,3.0,red);System.out.println(a.getArea();一个Fan有自己的品牌和型号，其功能有start，stop，speed，start和stop可以改变Fan的状态status(on/off)，speed可以调整Fan的速度（档级在0、1、2、3），请分析并提供Fan类的定义。并编写程序对其进行测试。Public class Fan private String band; private String type;private String status ;private int speed;public Fan(String band,String type,String status,int speed)this.band=band;this.type=type;this.status=status;this.speed=speed;public String start()return status;public String stop()return status;public void speed(int a)this.speed=a;public static void main(Stringargs)Fan t=new Fan(ss,dd,off,1);System.out.printf(%s,%s,%b,%d,t.band,t.type,t.status,t.speed); 解释下面的程序运行结果输出为什么是null public class My String s; public void My() s = Constructor; public void go() System.out.println(s); public static void main(String args) My m = new My(); m.go(); 调用者没有传递值2.写出程序运行结果class StaticDemo static int x;int y; static x=10;public static int getX() return x;public static void setX(int newX) x = newX;public int getY() return y;public void setY(int newY) y = newY;public static void main(String args) System.out.println(静态变量x=+StaticDemo.getX();System.out.println(实例变量y=+StaticDemo.getY(); /非法，编译时将出错StaticDemo a= new StaticDemo();StaticDemo b= new StaticDemo();a.setX(1);a.setY(2);b.setX(3);b.setY(4);System.out.println(静态变量a.x=+a.getX();System.out.println(实例变量a.y=+a.getY();System.out.println(静态变量b.x=+b.getX();System.out.println(实例变量b.y=+b.getY();静态变量x=10静态变量a.x=3实例变量a.y=2静态变量b.x=3实例变量b.y=42.一个计算机商店销售很多品牌的计算机，每台计算机都应该记录其配置信息，包括处理器、主板、显示器、内存、硬盘等基本设备，每个设备都有自己的品牌、价格、型号信息，请你尝试构造合适的类并利用组合的方法来表示计算机，并为该计算机类添加计算价格（各设备价格之和）、打印配置信息等方法。要求：将定义的类都放在一个包product内。Cpu.javapackage product;public class cpuprivate String brand;private double value;private String type;public cpu(String brand,double value,String type)this.brand=brand;this.value=value;this.type=type;public String getbrand()return brand;public String gettype()return type;public double getvalue()return value;public void print()System.out.println(brand:+getbrand()+t+value:+getvalue()+t+type:+gettype();/System.out.println(brand:);Hardware.javapackage product;public class hardwareprivate String brand;private double value;private String type;public hardware(String brand,double value,String type)this.brand=brand;this.value=value;this.type=type;public String getbrand()return brand;public String gettype()return type;public double getvalue()return value;public void print()System.out.println(brand:+getbrand()+t+value:+getvalue()+t+type:+gettype();/System.out.println(brand:);Mainboard .javapackage product;public class mainboard private String brand;private double value;private String type;public mainboard (String brand,double value,String type)this.brand=brand;this.value=value;this.type=type;public String getbrand()return brand;public String gettype()return type;public double getvalue()return value;public void print()System.out.println(brand:+getbrand()+t +value:+getvalue()+t+type:+gettype();/System.out.println(brand:);Monitor .javapackage product;public class monitorprivate String brand;private double value;private String type;public monitor(String brand,double value,String type)this.brand=brand;this.value=value;this.type=type;public String getbrand()return brand; public String gettype()return type;public double getvalue()return value; public void print()System.out.println(brand:+getbrand()+t+value:+getvalue()+t+type:+gettype();/System.out.println(brand:);Ram.javapackage product;public class ramprivate String brand;private double value;private String type;public ram(String brand,double value,String type)this.brand=brand;this.value=value;this.type=type;public String getbrand()return brand;public String gettype()return type;public double getvalue()return value;public void print()System.out.println(brand:+getbrand()+t+value:+getvalue()+t+type:+gettype();/System.out.println(brand:);computer.javapackage product;public class computerprivate cpu cp;private hardware hard;private mainboard main;private monitor mon;private ram ra;public computer()this.cp=new cpu(atm,232.2d,xora878);this.hard=new hardware(westdigital,300.2d,pc222);this.main=new mainboard(aim,321.2d,x-32);this.mon=new monitor(voa,900.2d,w-ss);this.ra=new ram(kingsdon,127.2d,s-24);public void kprint()cp.print();hard.print();main