java抽象類和抽象方法實(shí)驗(yàn)報(bào)告

課程名稱實(shí)驗(yàn)名稱學(xué)生學(xué)號(hào)實(shí)驗(yàn)?zāi)康模?/p>

實(shí)驗(yàn)報(bào)告面向?qū)ο蟪绦蛟O(shè)計(jì)實(shí)驗(yàn)五、抽象類和抽象方法姓名

日期 2018-4-28班級(jí)通過(guò)本次實(shí)驗(yàn)，要求學(xué)生能進(jìn)一步掌握抽象 類和抽象方法的概念，熟練義抽象類和抽象方法。實(shí)驗(yàn)條件：電腦一臺(tái)、能上網(wǎng)查閱資料。首先定義基本幾何圖形的抽象基類（ Shape），然后定義Shape的派生類Circle(圓形)、Square（正方形）和Triangle(三角形)。要求通過(guò)抽象方法方法覆蓋來(lái)計(jì)算各種圖形的面積和周長(zhǎng)。 (提示:求三角形的面積用海倫公式：S L*(La)*(Lb)*(Lc)，其中a,b,c是三角形的邊長(zhǎng)，L=(a+b+c)/2)，即周長(zhǎng)的一半。)源代碼：packageShape;publicabstractclassShape{protectedStringname;publicShape(){name="圖形類";}publicShape(Stringname){super();=name;}publicStringgetName(){returnname;}publicvoidsetName(Stringname){=name;}abstractdoublearea();abstractdoublelength();publicStringtoString(){//TODOAuto-generatedmethodstubreturnname+"周長(zhǎng)是："+length()+","+"面積是："+area();}packageShape;publicclassCircleextendsShape{privatedoubler;publicCircle(doubler,Stringname){super(name);this.r=r;}publicdoublegetR(){returnr;}publicvoidsetR(doubler){this.r=r;}doublearea(){//TODOAuto-generatedmethodstubreturnMath.PI*Math.pow(r,2);}doublelength(){//TODOAuto-generatedmethodstubreturnMath.PI*r*2;}}packageShape;publicclassSquareextendsShape{privatedoublea;publicSquare(doublea,Stringname){super(name);this.a=a;}publicdoublegetA(){returna;}publicvoidsetA(doublea){this.a=a;}doublearea(){//TODOAuto-generatedmethodstubreturnMath.pow(a,2);}doublelength(){//TODOAuto-generatedmethodstubreturn4*a;}packageShape;publicclassTriangleextendsShape{privatedoublea;privatedoubleb;privatedoublec;publicTriangle(doublea,doubleb,doublec,Stringname){super(name);this.a=a;this.b=b;this.c=c;}publicdoublegetA(){returna;}publicvoidsetA(doublea){this.a=a;}publicdoublegetB(){returnb;}publicvoidsetB(doubleb){this.b=b;}publicdoublegetC(){returnc;}publicvoidsetC(doublec){this.c=c;}doublearea(){//TODOAuto-generatedmethodstubdoublel=(a+b+c)/2;returnMath.sqrt(l*(l-a)*(l-b)*(l-c));}doublelength(){//TODOAuto-generatedmethodstubreturna+b+c;}}packageShape;publicclassDemo{publicstaticvoidmain(String[]args){Shapes1=null;s1=newCircle(5,"圓形");System.out.println(s1.toString());s1=newSquare(6,"正方形");System.out.println(s1.toString());s1=newTriangle(3,4,5,"三角形");System.out.println(s1.