JAVA继承类求几何图形面积周长代码.doc

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1、classshap2D{staticdoublegetArea;//面积staticdoublegetPerimeter;//周长}classcircleextendsshap2D{doubler;doublegetRadius(){returnr=2;}doublegetArea(){returnMath.PI*r*r;}doublegetPerimeter(){return2*Math.PI*r;}publicStringtoString(){Strings;returns="周长："+getPerimeter()+"面积:"

2、+getArea();}}classTriangleextendscircle{doublea,b,c;Triangle(doublex,doubley,doublez){a=x;b=y;c=z;}voidsetA(doublex){a=x;}doublegetA(){returna;}publicdoublegetPerimeter(){returna+b+c;}publicdoublegetArea(){doubles=(a+b+c)/2;returnMath.sqrt(s*(s-a)*(s-b)*(s-c));}public

3、booleanisTriangle(){booleanflag=false;if(a>0&&b>0&&c>0&&a+b>c&&a+c>b&&c+b>a)flag=true;returnflag;}}classrectangleextendscircle{doublea,b;rectangle(doublex,doubley){a=x;b=y;}voidsetA(doublex){a=x;}doublegetA(){returna;}publicdoublegetPerimeter(){return2*(a+b);}publicdo

4、ublegetArea(){returna*b;}}publicclassShap{publicstaticvoidmain(Stringargs[]){circlec1=newcircle();System.out.println("圆的的半径"+c1.getRadius()+c1.toString());Trianglet=newTriangle(3,4,5);System.out.println("三角形周长："+t.getPerimeter());if(t.isTriangle())System.out.println("

5、三角形面积"+t.getArea());rectangler=newrectangle(4,5);System.out.print("矩形"+t.toString());}