創建提示用戶使用拋出的異常錯誤的驅動程序

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編寫驅動程序時，提示用戶輸入圓的規格，創建圓對象並輸出圓的區域。確保你的程序正確處理circle類拋出的錯誤IllegalDimesnsionException。創建提示用戶使用拋出的異常錯誤的驅動程序

所以這是我到目前爲止有：

import java.util.Scanner; 

//A = C2/4π 

public class Driver { 
    public static void main(String[] args) { 
     String know; 
     // area of a circle 
     int Circumference; 
     int Diameter; 
     int Radius; 

     // pie of a circle 
     double pie; 
     double area; 

     // ask user for input 
     Scanner scanner = new Scanner(System.in); 
     System.out 
       .println("Do you know the Diameter, Circumference or the Radius of the circle?"); 
     know = scanner.nextLine(); 
     if (know.equals("Diameter")) { 
      System.out.println("What is the Diameter of the circle??"); 
      Diameter = scanner.nextInt(); 
      // Get area A = (π/4) × D2 

      pie = 3.14; 
      area = (pie/4) * (Diameter^2); 
      System.out.println("The area of the circle is: " + area); 
     } 
     if (know.equals("Radius")) { 
      System.out.println("What is the radius of the circle??"); 
      Radius = scanner.nextInt(); 
      // Get area A = π × r2 

      pie = 3.14; 
      area = pie * (Radius^2); 
      System.out.println("The area of the circle is: " + area); 
     } 

     if (know.equals("Circumference")) { 
      System.out.println("What is the circumference of the circle??"); 
      Circumference = scanner.nextInt(); 

      // Get area 
      pie = 3.14; 
      area = (Circumference^2)/4 * pie; 
      System.out.println("The area of the circle is: " + area); 
     } 
    } 
}

我只是需要幫助得到程序來處理異常錯誤。任何其他的建議，使程序更好。

來源

2012-10-08 Chaz32621

我們正在爲你做作業嗎？ –

... [[作業問題已正式棄用]]（http://meta.stackexchange.com/questions/147100/the-homework-tag-is-now-officially-deprecated） – Augusto

@Augusto - 作業標籤！=作業問題。 –

如果您正在尋找審查/反饋，請找一些如下：

更好申報半徑，直徑和雙倍徑（因爲它使礦石感）

變化如「Diameter = scanner.nextInt（）;」如下面要由用戶處理無效輸入：

boolean validInput = false; 
do{ 
    try{ 
     diameter = scanner.nextDouble(); 
     validInput = true; 
    }catch(InputMismatchException ime){ 
     System.out.println("Invalid input. Please try again"); 
    } 
    }while(validInput == false);

創建2層小的方法（模塊式）來計算不同的值例如

private double calculateAreaUsingRadius(double radius) 
         throws IllegalDimesnsionException; 
private double calculateAreaUsingCircumference(double circumference) 
         throws IllegalDimesnsionException;

調用這些方法在你的主程序，如下面的異常處理：

try{ 
     area = calculateAreaUsingRadius(radius); 
}catch(IllegalDimesnsionException){ 
     System.out.println("Invalid Radius Dimension"); 
} 


try{ 
     area = calculateAreaUsingRadius(diameter/2); 
}catch(IllegalDimesnsionException){ 
     System.out.println("Invalid Diameter Dimension"); 
} 


try{ 
     area = calculateAreaUsingCircumference(circumference); 
}catch(IllegalDimesnsionException){ 
     System.out.println("Invalid Circumference Dimension"); 
}

希望這將有助於改善你的程序。

來源

2012-10-08 18:42:14

創建提示用戶使用拋出的異常錯誤的驅動程序

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