Calculate the area of different shape shapes based on perimeter? Calculate the area of multiple graphs

/** * Calculate the area of different shapes according to perimeter? Calculates the area of a variety of graphs, * and compares the maximum values of various graphic areas. The square area formula is: 0.0625*c*c. * Circle Area formula is: 0.0796*c*c, where c represents the perimeter of the graph. */

/** * Calculate the area of different shapes according to perimeter? Calculates the area of a variety of graphs, * and compares the maximum values of various graphic areas. The square area formula is: 0.0625*c*c. * Circle Area formula is: 0.0796*c*c, where c represents the perimeter of the graph. */ Public classAreatest { Public Static voidMain (string[] args) {//have learned the collection, try to use the collection to do this problem://defines a collection and adds the address of the graphical element instance to the collection        /*list<shape> shapeslist = new arraylist<shape> ();        Shapeslist.add (New Circle (1));        Shapeslist.add (New Circle (15));        Shapeslist.add (New Square (5)); Shapeslist.add (new Square);*/        //Compare Size        /*1. The method of comparing the size of an array is to assume a maximum value, and then compare it in turn, exchanging the maximum value of * 2. How about a collection? Try the same way.         * 3. Assuming that the first element is the maximum value, the area of the first garden needs to be calculated and assigned to double Max;         * 4. Iterate through the collection, can you swap the elements with iterators? * */        /*either way, the first step is to set the maximum value. * Collection gets elements by List.get (element subscript)*/        /*Double maxarea = shapeslist.get (0). Area ();*/        /*The new loop iterates through the collection, but cannot manipulate the specific subscript, so I don't know the subscript for the largest graph*/        /*For (Shape shapes:shapeslist) {if (Maxarea < Shapes.area ()) {Maxarea = Shapes.area (); }} System.out.println ("Maximum area:" +maxarea);*/        /*with the old cycle, the maximum area and subscript position can be obtained.*/        /*int indexmax = 0; for (int i =0;i<shapeslist.size (), i++) {if (Maxarea < Shapeslist.get (i). Area ()) {Maxarea = s                Hapeslist.get (i). area ();            Indexmax = i;        }} System.out.println ("Maximum area:" +maxarea); System.out.println ("The maximum area corresponding subscript is:" +indexmax);*/        /*Iterator Procedure*/        /*iterator<shape> it = Shapeslist.iterator ();            while (It.hasnext ()) {Shape shapes = It.next ();            if (Maxarea < Shapes.area ()) {Maxarea = Shapes.area (); }} System.out.println ("Maximum area:" +maxarea);*/        /*Array Practices*/        //defines an array that stores graphical objects.shape[] Shapes =Newshape[4]; shapes[0] =NewCircle (1); shapes[1] =NewCircle (2); shapes[2] =NewSquare (5); shapes[3] =NewSquare (4); DoubleMaxarea = shapes[0].area (); intindex =0;  for(intI=0; i<shapes.length;i++){            DoubleArea =Shapes[i].area (); if(Maxarea <Area ) {Maxarea=Area ; Index=i; }} System. out. println ("The maximum area is:"+Maxarea); System. out. println ("The subscript for the maximum area corresponds to:"+index); }}

View Code

Classes that define individual graphs

/*figure area, because do not know the specific graphics, you must define an abstract class, the graph has a perimeter, but the area of the method is different, each method to write specific*/Abstract classshape{protected DoubleC; //The perimeter of the graph, which is titled a given value, can be used as a known property to directly construct the method when assigning C.    Abstract DoubleArea (); //because the area formulas of different graphs are not the same, they are written in abstract way, and the subclasses are implemented according to the different formulas.}classCircleextendsShape {/*Circular construction method when creating a circular instance, the value of C is assigned*/     PublicCircle (Doublec) {         This. C =C; }    /*finding the area of the garden according to the area formula of Circle*/@OverrideDoubleArea () {returnc*c*0.0796; }}classSquareextendsshape{/*constructor method to create a square instance, the value of C is assigned*/     PublicSquare (Doublec) {         This. C =C; }    /*Calculate square area According to Square area formula*/@OverrideDoubleArea () {returnc*c*0.0625; }}

View Code

Calculate the area of different shape shapes based on perimeter? Calculate the area of multiple graphs