任務(wù)實(shí)訓(xùn)15-抽象方法和抽象類的應(yīng)用

Java程序設(shè)計(jì)Java程序設(shè)計(jì)實(shí)驗(yàn)指導(dǎo)書2016－20172學(xué)期PAGEPAGE5任務(wù)實(shí)訓(xùn)15 抽象方法和抽象類的應(yīng)用一、實(shí)訓(xùn)目的1.掌握J(rèn)ava二、實(shí)訓(xùn)內(nèi)容1三、實(shí)訓(xùn)步驟定義抽象類幾何類、普通類圓類和矩形類，完成抽象類的繼承和使用。GeometricObject為父類，圓類GeometricObjectcolorfindArea和findAreafindPerimeter長(zhǎng)。CircleRectangle類是GeometricObjectGeometricObject的引用變量引用它們，調(diào)用抽象方法。abstractclassGeometricObject{protectedStringcolor;protecteddoubleprotectedGeometricObject(Stringcolor,doubleweight){this.color=color;this.weight=}publicabstractdoublefindArea();publicabstractdoublefindPerimeter();}classCircleextendsGeometricObject{protecteddoubleradius;publicCircle(doubleradius){super("white",1.0);this.radius=}publicdoublefindArea(){returnradius*radius*Math.PI;}publicdoublefindPerimeter(){return2*radius*Math.PI;}}classRectangleextendsGeometricObject{protecteddoublewidth;protecteddoublepublicRectangle(doublewidth,doubleheight){super("white",1.0);this.width=width;this.height=}publicdoublefindArea(){returnwidth*height;}publicdoublefindPerimeter(){return2*(width+height);}}publicclassTestAb{publicstaticvoidmain(String[]args){GeometricObjecta1=newCircle(5);GeometricObjecta2=newRectangle(5,test(a1);test(a2);}publicstaticvoidtest(GeometricObjecta){System.out.println(a.findArea());}}定義抽象類動(dòng)物類、普通狗類和貓類，完成抽象類的繼承和使用。AnimalDogCat類。Animaltype，表示動(dòng)物的類型；該類要具備構(gòu)造方法和talktalk打印出動(dòng)物叫喊的聲音。DogCat類是Animal類的子類，他們應(yīng)實(shí)現(xiàn)父類的抽象方法。DogCattalk方法。代碼參考課本111頁(yè)例題2.19。定義自行車類、共享單車類，完成抽象類的繼承和使用。子類。自行車類中定義屬性車輪、座椅和鈴；定義了方法按鈴、騎行。二維碼，密碼鎖；共享單車特有方法：獲得密碼，