作業4：計算鋼板的利用率
題目類別: B作業

關鍵字: 接口 類 繼承 實現 多態

內容要求:

問題描述：

某工廠需要在矩形的鋼板上截取不同形狀來制作零件。截取形狀過程中需要記錄形狀類型及可以計算形狀面積的必要數據。

首先記錄鋼板的大小：寬度和高度

目前的形狀有：

矩形，類型用字符A表示，記錄數據為寬度和高度

圓形，類型用字符B表示，記錄數據為半徑

梯形，類型用字符C表示，記錄數據為上底寬、下底寬和高度

編寫Java應用程序根據記錄的數據計算鋼板和利用率。要求如下：

(1) 從鍵盤讀取數據，鍵盤輸入數據格式為：

第一行是兩個實數，表示鋼板的寬度和高度；

以后每一行代表一個形狀的數據，包括類型及計算面積的數據

例如：

2000 1000

A 20 30

B 30

B 45.5

C 10 30.5 15

A 10 40

(2) 根據輸入的數據計算并輸出該鋼板的利用率。

(3) 采用面向抽象的編程方式，基于抽象類或接口進行編程。

(4) 程序具有較好的擴展性，例如增加一種形狀三角形（類型符為D，記錄三角形的三條邊長）時，計算利用率的代碼不會被修改。

總結：
1.這是用了一個Calculation接口
2.這里換行結束我查了很久的一種辦法就是：

import java.io.IOException; import java.io.InputStreamReader; String kinds = ""; BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); kinds = bf.readLine(); if (kinds.length() == 0)

Main

// // Source code recreated from a .class file by IntelliJ IDEA // (powered by FernFlower decompiler) //package com.company;import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Scanner;public class Main {public Main() {}public static void main(String[] args) throws IOException {System.out.println("請分別輸入鋼板的長和寬");Scanner cin = new Scanner(System.in);BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));SteelPlate s = new SteelPlate(cin.nextDouble(), cin.nextDouble());double using = 0.0D;while(true) {System.out.println("請輸入A/B/C (輸入回車即結束）：");String kinds = "";kinds = bf.readLine();if (kinds.length() == 0) {System.out.println("利用率為：" + using / s.getArea() * 100.0D + "%");return;}if (kinds.charAt(0) == 'A') {System.out.println("請分別輸入矩形的寬和高：");Rectangle r = new Rectangle(cin.nextDouble(), cin.nextDouble());using += r.getArea();} else if (kinds.charAt(0) == 'B') {System.out.println("請輸入圓形的半徑：");Circle c = new Circle(cin.nextDouble());using += c.getArea();} else if (kinds.charAt(0) == 'C') {System.out.println("請輸入梯形的上邊和下邊和高：");Trapezoid t = new Trapezoid(cin.nextDouble(), cin.nextDouble(), cin.nextDouble());using += t.getArea();}}} }

Calculation接口

// // Source code recreated from a .class file by IntelliJ IDEA // (powered by FernFlower decompiler) //package com.company;public interface Calculation {double PI = 3.14D;double getArea();double getUtilizationRate(double var1); }

Circle

package com.company;public class Circle implements Calculation{private double radius;public Circle(double radius) {this.radius = radius;}public double getRadius() {return radius;}public void setRadius(double radius) {this.radius = radius;}@Overridepublic double getArea(){return radius*PI*radius;}@Overridepublic double getUtilizationRate(double steelArea) {return getArea()/steelArea;}}

Rectangle

package com.company;public class Rectangle implements Calculation{private double width;public Rectangle(double width, double height) {this.width = width;this.height = height;}public double getWidth() {return width;}public void setWidth(double width) {this.width = width;}public double getHeight() {return height;}public void setHeight(double height) {this.height = height;}public double height;@Overridepublic double getArea(){return width*height;}@Overridepublic double getUtilizationRate(double steelArea) {return getArea()/steelArea;}} package com.company;public class Trapezoid implements Calculation{private double top;private double bottom;public double getTop() {return top;}public void setTop(double top) {this.top = top;}public double getBottom() {return bottom;}public void setBottom(double bottom) {this.bottom = bottom;}public double getHeight() {return height;}public void setHeight(double height) {this.height = height;}public Trapezoid(double top, double bottom, double height) {this.top = top;this.bottom = bottom;this.height = height;}@Overridepublic double getArea(){return (top+bottom)*height/2;}@Overridepublic double getUtilizationRate(double steelArea) {return getArea()/steelArea;}public double height; } package com.company;public class SteelPlate {private double width;private double height;public double getWidth() {return width;}public SteelPlate(double width, double height) {this.width = width;this.height = height;}public void setWidth(double width) {this.width = width;}public double getHeight() {return height;}public void setHeight(double height) {this.height = height;}public double getArea(){return this.width*this.height;} }

總結

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