lader-area.txt

问题描述：编写一个应用程序计算梯形的面积。 基本要求：通过在程序中定义2个类来分别描述梯形的属性和求面积的方法

import java.io.*;

import java.lang.Math.*;



/**

* 实验3，面向对象基础1

*


*/

public class Shape {

     public static void main(String args[])throws IOException {

         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

         double a = 0, b = 0, c = 0;

         System.out.println("分别输入梯形的上底,下底和高:");

         do {                

             try {

                 a = Double.parseDouble(br.readLine());

                 b = Double.parseDouble(br.readLine());

             } catch (NumberFormatException e) {

                 System.out.println("数字不合法,请重新输入:");

                 continue;

             }  

         }while (!Lader.isLader(a, b, c));

                

         Lader lader1 = new Lader(a, b, c);

         System.out.println("面积:" + lader1.getArea());

     }

}


class Lader {

     private double a, b, c;

     public static boolean isLader(double a, double b, double c) {

            

         if (b != a)  { 

             return true;

         } else {

             System.out.println("不能构成梯型,重新输入：");

             return false;

         }

                

     } 


     public double getArea() {

         double p = (a + b) / 2;

         return Math.sqrt(p * c);

     }



     public lader1(double a, double b, double c) {           

         this.a = a;

         this.b = b;

         this.c = c;

     }

       

}