類的繼承與封裝

JAVA程序設計實驗報告姓 名霍奮偉學號10 班級1420552成績設備名稱及軟件環(huán)境IDE&1實驗名稱類的繼承與封裝實驗日期2016.4.20一.實驗內容類的繼承與封裝：定義抽象類Shape（形狀）其中有抽象方法用來求某形狀的周長和面積；定義Shape類的子類Circle（圓形）、Triangle（三角形）、Rect（矩形）其中包括該形狀的位置、大小信息并實現(xiàn)求其周長和面積的方法。假設當前有圓心為（30,70）半徑為50的圓，左上角坐標為（20,200）,水平寬度為120，垂直高度為80的矩形，以及三個頂點坐標分別為（200,200）、（300,400）、（150,350）的三角形，請在控制臺輸出每個形狀的相關信息，及所有形狀的周長和面積的和。接口的定義與實現(xiàn)：通過接口和實現(xiàn)接口的類來完成上一題目。二.重點及難點類、類的數(shù)據(jù)成員和成員方法的定義與實現(xiàn)；抽象類與類的繼承；接口與接口的實現(xiàn)public、private、static、final、abstract等修飾符的作用。三?理論分析或算法分析在接口中定義兩個函數(shù)，分別實現(xiàn)面積和周長的功能；定義三個類實現(xiàn)其接口,在類中實現(xiàn)面積和周長兩個函數(shù)。在main函數(shù)中測試。［實驗步驟］復習有關Java中類、類的繼承、接口、接口的實現(xiàn)的相關內容;根據(jù)題目要求編寫需要的抽象類和其子類；根據(jù)題目要求編寫相應的main方法完成程序；根據(jù)題目要求編寫需要的接口和實現(xiàn)該接口的類；根據(jù)題目要求編寫相應的main方法完成程序；調試代碼，完善程序。四?實現(xiàn)方法(含實現(xiàn)思路、程序流程圖和源程序列表等)1.抽象類importjava.applet.Applet;importjava.awt.*;importjava.awt.geom.*;abstractclassShapes{publicdoublex,y;publicdoublewidth,height;publicShapes(doublex,doubley,doublewidth,doubleheight){this.x=x;this.y=y;this.width二width;this.height=height;}abstractdoublegetArea();abstractdoublegetPeimeter();}classSquareextendsShapes{publicdoublegetArea(){returnwidth*height;}publicdoublegetPerimeter(){return(2*width+2*height);}publicSquare(doublex,doubley,doublewidth,doubleheight){super(x,y,width,height);}@OverridedoublegetPeimeter(){return0;}}classTriangleextendsShapes{publicdoublec;publicdoublegetArea(){return(0.5*width*height);}publicdoublegetPerimeter(){return(width+height+c);};publicTriangle(doublex,doubley,doublewidth,doubleheight){super(x,y,width,height);c=Math.sqrt(width*width+height*height);}@OverridedoublegetPeimeter(){return0;}}classCricleextendsShapespublicCricle(doublex,doubley,doublewidth,doubleheight){super(x,y,width,height);r=(double)width/2.0;{publicdoubler;publicdoublegetArea(){return(r*r*Math.PI);}publicdoublegetPerimeter(){return(2*Math.PI*r);}publicCricle(doublex,doubley,doublewidth,doubleheight){super(x,y,width,height);r=(double)width/2.0;}@OverridedoublegetPeimeter(){return0;}}publicclasshfwlextendsApplet{SquareBox=newSquare(20,200,120,80);CricleOval二newCricle(30,70,100,100);doubleb=Math.sqrt(Math.pow((150-200),2)+Math.pow((350-200),2));doublec=Math.sqrt(Math.pow((150-300),2)+Math.pow((350-400),2));Triangletri二newTriangle(0,0,b,c);publicvoidpaint(Graphicsg){ //輸出長方形的信息g.drawRect(20,200,120,80);g.drawString("BoxArea:"+Box.getArea(),20,300);g.drawString("BoxPerimeter:"+Box.getPerimeter(),20,320);//輸出圓的信息g.drawOval(30,70,100,100);g.drawString("OvalArea:"+Oval.getArea(),150,100);g.drawString("OvalPerimeter:"+Oval.getPerimeter(),150,120);//輸出三角形的信息Graphics2Dg2=(Graphics2D)g;intxl[]={150,200,300,150};intyl[]={350,200,400,350};GeneralPathpolygon=newGeneralPath(0,xl.length+yl.length);polygon.moveTo(xl[0],yl[0]);for(intindex=l;index〈xl.length;index++){polygon.lineTo(xl[index],y1[index]);}polygon.closePath();g2.draw(polygon);g.drawString("TriangleArea:"+tri.getArea(),280,280);g.drawString("TrianglePerimeter:"+tri.getPerimeter(),290,300);}2.接口importjava.applet.Applet;importjava.awt.*;importjava.awt.geom.*;interfaceShape{abstractdoublegetArea();doublegetPerimeter();}classCirclerimplementsShape{publicdoublex,y;publicdoublewidth,height;publicdoubler;@OverridepublicdoublegetArea(){return(r*r*Math.PI);}@OverridepublicdoublegetPerimeter(){return(2*r*Math.PI);}publicCircler(doublex,doubley,doublewidth,doubleheight){this.x=x;this.y=y;this.width二width;this.height=height;r=(double)width/2.0;}}classSquarerimplementsShape{publicdoublex,y;publicdoublewidth,height;@OverridepublicdoublegetArea(){return(width*height);}@OverridepublicdoublegetPerimeter(){return(2*width+2*height);}publicSquarer(doublex,doubley,doublewidth,doubleheight){this.x=x;this.y=y;this.width二width;this.height=height;}}classTrianglerimplementsShape{publicdoublewidth,height;publicdoublec;?Overridepublicdoublex,y;publicdoublewidth,height;publicdoublec;@0verridepublicdoublegetArea(){return(0.5*width*height);}@0verridepublicdoublegetPerimeter(){return(width+height+c);}publicTriangler(doublex,doubley,doublebase,doubleheight){this.x=x;this.y=y;this.width二base;this.height=height;c=Math.sqrt(width*width+height*height);}}publicclassllllextendsApplet{SquarerBox=newSquarer(20,200,120,80);CirclerOval=newCircler(30,70,100,100);doubleb=Math.sqrt(Math.pow((150-200),2)+Math.pow((350-200),2));doublec=Math.sqrt(Math.pow((150-300),2)+Math.pow((350-400),2));Trianglertri二newTriangler(0,0,b,c);publicvoidpaint(Graphicsg){ //輸出長方形的信息g.drawRect(20,200,120,80);g.drawString("BoxArea:"+Box.getArea(),20,300);g.drawString("BoxPerimeter:"+Box.getPerimeter(),20,320);//輸出圓的信息g.drawOval(3O,7O,lOO,lOO);g.drawString("OvalArea:"+Oval.getArea(),150,100);g.drawString("OvalPerimeter:"+Oval.getPerimeter(),150,120);//輸出三角形的信息Graphics2Dg2=(Graphics2D)g;intxl[]={150,200,300,150};intyl[]={350,200,400,350};GeneralPathpolygon=newGeneralPath(O,xl.length+yl.length);polygon.moveTo(xl[O]