編輯ExceptionSample以便它可以捕獲其中文本作為字串輸入而不是整數資料型別輸入的例外-有解無憂

如果輸入是字串而不是整數，如何捕獲例外？因為他們使用了Try, Catch，Finally這讓我感到困惑，這對我來說看起來很新。請賜教謝謝。

import java.util.*;
public class ExceptionSample {
    public static void main (String[]args){
       Scanner s = new Scanner(System.in);
       int dividend, divisor, quotient;
       System.out.print("Enter dividend: ");
       dividend = s.nextInt();
       System.out.print("Enter divisor: ");
       divisor = s.nextInt();
       try {
        quotient = dividend/divisor;
        System.out.println(dividend   " / "   divisor   " = "   quotient);
       }
       catch (ArithmeticException ex) {
        System.out.println("Divisor cannot be 0.");
        System.out.println("Try again.");
       }
        finally  {
    System.out.println("Thank you.");
    }
    }
}

uj5u.com熱心網友回復：

它會是這樣的：

Scanner s = new Scanner(System.in);

int dividend, divisor, quotient;
while (true) {
    System.out.print("Enter dividend: ");
    try {
        dividend = s.nextInt();
    } 
    catch (java.util.InputMismatchException ex) {
        System.out.println("Invalid Dividend Entry! Try again...\n"); 
        s.nextLine(); // consume the Enter Key Hit.
        continue;
    }
    break;
}
    
while (true) {
    System.out.print("Enter divisor: ");
    try {
        divisor = s.nextInt();
        if (divisor == 0) {
            throw new java.util.InputMismatchException();
        }
    }
    catch (java.util.InputMismatchException ex) {
        System.out.println("Invalid Divisor Entry! Try again...\n"); 
        s.nextLine(); // consume the Enter Key Hit.
        continue;
    }
    break;
}
    
try {
    quotient = dividend / divisor;
    System.out.println(dividend   " / "   divisor   " = "   quotient);
}
catch (ArithmeticException ex) {
    System.out.println("Divisor cannot be 0.");
    System.out.println("Try again.");
}
finally {
    System.out.println("Thank you.");
    s.close();
}

當使用Scanner#nextInt()方法并提供一個或多個字母字符時，將引發InputMismatchException。我們捕獲此例外并利用它來驗證數字輸入。

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標籤：爪哇例外数学表达式

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