类的继承与封装.doc

JAVA程序设计实验报告姓 名霍奋伟学 号10班 级1420552成 绩设备名称及软件环境 IDE 8.1实验名称类的继承与封装实验日期2016.4.201 实验内容1.类的继承与封装：定义抽象类Shape（形状）其中有抽象方法用来求某形状的周长和面积；定义Shape类的子类Circle（圆形）、Triangle（三角形）、Rect（矩形）其中包括该形状的位置、大小信息并实现求其周长和面积的方法。假设当前有圆心为（30,70）半径为50的圆，左上角坐标为（20,200），水平宽度为120，垂直高度为80的矩形，以及三个顶点坐标分别为（200,200）、（300，400）、（150,350）的三角形，请在控制台输出每个形状的相关信息，及所有形状的周长和面积的和。2.接口的定义与实现：通过接口和实现接口的类来完成上一题目。2 重点及难点类、类的数据成员和成员方法的定义与实现；抽象类与类的继承；接口与接口的实现public、private、static、final、abstract等修饰符的作用。3 理论分析或算法分析 在接口中定义两个函数，分别实现面积和周长的功能；定义三个类实现其接口，在类中实现面积和周长两个函数。在main函数中测试。实验步骤1. 复习有关Java中类、类的继承、接口、接口的实现的相关内容；2. 根据题目要求编写需要的抽象类和其子类；3. 根据题目要求编写相应的main方法完成程序；4. 根据题目要求编写需要的接口和实现该接口的类；5. 根据题目要求编写相应的main方法完成程序；6. 调试代码，完善程序。4 实现方法（含实现思路、程序流程图和源程序列表等）1.抽象类import java.applet.Applet;import java.awt.*;import java.awt.geom.*;abstract class Shapes public double x,y; public double width,height; public Shapes(double x,double y,double width,double height) this.x=x; this.y=y; this.width=width; this.height=height; abstract double getArea(); abstract double getPeimeter();class Square extends Shapes public double getArea()return width*height; public double getPerimeter()return(2*width+2*height);public Square(double x,double y,double width,double height) super(x, y, width, height);Overridedouble getPeimeter() return 0;class Triangle extends Shapes public double c;public double getArea()return(0.5*width*height);public double getPerimeter()return(width+height+c);public Triangle(double x,double y,double width,double height) super(x, y, width, height);c=Math.sqrt(width*width+height*height);Overridedouble getPeimeter() return 0;class Cricle extends Shapes public Cricle(double x,double y,double width,double height) super(x, y, width, height);r=(double)width/2.0;Overridedouble getPeimeter() return 0;public class hfw1 extends AppletSquare Box=new Square(20,200,120,80);Cricle Oval=new Cricle(30,70,100,100);double b=Math.sqrt(Math.pow(150-200),2)+Math.pow(350-200),2);double c=Math.sqrt(Math.pow(150-300),2)+Math.pow(350-400),2);Triangle tri=new Triangle(0,0,b,c);public void paint(Graphics g) /输出长方形的信息g.drawRect(20,200,120,80); g.drawString (Box Area:+Box.getArea(),20,300);g.drawString (Box Perimeter:+Box.getPerimeter(),20,320); /输出圆的信息g.drawOval(30,70,100,100);g.drawString (Oval Area:+Oval.getArea(),150,100);g.drawString (Oval Perimeter:+Oval.getPerimeter(),150,120); /输出三角形的信息 Graphics2D g2=(Graphics2D)g; int x1=150,200,300,150; int y1=350,200,400,350; GeneralPath polygon=new GeneralPath(0,x1.length+y1.length); polygon.moveTo(x10,y10 ); for(int index=1;indexx1.length;index+) polygon.lineTo(x1index, y1index); polygon.closePath(); g2.draw(polygon); g.drawString ( Triangle Area:+tri.getArea(),280,280); g.drawString (Triangle Perimeter:+tri.getPerimeter(),290,300); public double r; public double getArea()return(r*r*Math.PI); public double getPerimeter()return(2*Math.PI*r);public Cricle(double x,double y,double width,double height) super(x, y, width, height);r=(double)width/2.0;Overridedouble getPeimeter() return 0;public class hfw1 extends AppletSquare Box=new Square(20,200,120,80);Cricle Oval=new Cricle(30,70,100,100);double b=Math.sqrt(Math.pow(150-200),2)+Math.pow(350-200),2);double c=Math.sqrt(Math.pow(150-300),2)+Math.pow(350-400),2);Triangle tri=new Triangle(0,0,b,c);public void paint(Graphics g) /输出长方形的信息g.drawRect(20,200,120,80); g.drawString (Box Area:+Box.getArea(),20,300);g.drawString (Box Perimeter:+Box.getPerimeter(),20,320); /输出圆的信息g.drawOval(30,70,100,100);g.drawString (Oval Area:+Oval.getArea(),150,100);g.drawString (Oval Perimeter:+Oval.getPerimeter(),150,120); /输出三角形的信息 Graphics2D g2=(Graphics2D)g; int x1=150,200,300,150; int y1=350,200,400,350; GeneralPath polygon=new GeneralPath(0,x1.length+y1.length); polygon.moveTo(x10,y10 ); for(int index=1;indexx1.length;index+) polygon.lineTo(x1index, y1index); polygon.closePath(); g2.draw(polygon); g.drawString ( Triangle Area:+tri.getArea(),280,280); g.drawString (Triangle Perimeter:+tri.getPerimeter(),290,300); 2. 接口import java.applet.Applet;import java.awt.*;import java.awt.geom.*;interface Shape abstract double getArea();double getPerimeter();class Circler implements Shape public double x,y;public double width,height;public double r; Overridepublic double getArea() return (r*r*Math.PI); Overridepublic double getPerimeter() return (2*r*Math.PI);public Circler(double x,double y,double width,double height)this.x=x;this.y=y;this.width=width;this.height=height;r=(double)width/2.0; class Squarer implements Shapepublic double x,y;public double width,height; Overridepublic double getArea() return (width*height); Overridepublic double getPerimeter() return (2*width+2*height);public Squarer(double x,double y,double width,double height)this.x=x;this.y=y;this.width=width;this.height=height;class Triangler implements Shape public double width,height;public double c; Overridepublic double getArea() return (0.5*width*height); Overridepublic double getPerimeter() return (width+height+c);public Triangler(double x,double y,double base,double height) this.x=x;this.y=y;this.width=base;this.height=height;c=Math.sqrt(width*width+height*height); public class llll extends Applet Squarer Box=new Squarer(20,200,120,80);Circler Oval=new Circler(30,70,100,100);double b=Math.sqrt(Math.pow(150-200),2)+Math.pow(350-200),2);double c=Math.sqrt(Math.pow(150-300),2)+Math.pow(350-400),2);Triangler tri=new Triangler(0,0,b,c); /* * * param g */ Overridepublic void paint(Graphics g) /输出长方形的信息g.drawRect(20,200,120,80); g.drawString (Box Area:+Box.getArea(),20,300);g.drawString (Box Perimeter:+Box.getPerimeter(),20,320); /输出圆的信息g.drawOval(30,70,100,100);g.drawString (Oval Area:+Oval.getArea(),150,100);g.drawString (Oval Perimeter:+Oval.getPerimeter(),150,120); /输出三角形的信息 Graphics2D g2=(Graphics2D)g; int x1=150,200,300,150; int y1=350,200,400,350; GeneralPath polygon=new GeneralPath(0,x1.length+y1.length); polygon.moveTo(x10,y10 ); for(int index=1;indexx1.length;index+) polygon.lineTo(x1index, y1index); polygon.closePath(); g2.draw(polygon); g.drawString ( Triangle Area:+tri.getArea(),280,280); g.drawString (Triangle Perimeter:+tri.getPerimeter(),290,300); public double x,y;public double width,height;public double c; Overridepublic double getArea() return (0.5*width*height); Overridepublic double getPerimeter() return (width+height+c);public Triangler(double x,double y,double base,double height) this.x=x;this.y=y;this.width=base;this.height=height;c=Math.sqrt(width*width+height*height); public class llll extends Applet Squarer Box=new Squarer(20,200,120,80);Circler Oval=new Circler(30,70,100,100);double b=Math.sqrt(Math.pow(150-200),2)+Math.pow(350-200),2);double c=Math.sqrt(Math.pow(150-300),2)+Math.pow(350-400),2);Triangler tri=new Triangler(0,0,b,c); public void paint(Graphics g) /输出长方形的信息g.drawRect(20,200,120,80); g.drawString (Box Area:+Box.getArea(),20,300);g.drawString (Box Perimeter:+Box.getPerimeter(),20,320); /输出圆的信息g.drawOval(30,70,100,100);g.drawString (Oval Area:+Oval.getArea(),150,100);g.drawString (Oval Perimeter:+Oval.getPerimeter(),150,120); /输出三角形的信息 Graphics2D g2=(Graphics2D)g; int x1=150,200,300,15