我定義了一個隨機數，我想檢查它是否是回文Java

Question

import java.util.Random;

public class Loop6 {
    public static void main(String[] args) {

        Random number = new Random();
        int value = number.nextInt(1000);
        System.out.println("random number : " + " " + value);

        int rev = 0;
        int dig;

        while (value > 0) {
            dig = value % 10;
            rev = rev * 10;
            rev = rev + dig;
            value = value / 10;
        }
        System.out.println("rev is : " + "" + rev);
        if(value==rev) {
            System.out.println("Palindrome");

        }

    }
}

Answer 1

Java具有內置的方法來反轉字符串。

String originalValue = value + "";
StringBuilder stringBuilder = new StringBuilder(originalValue);
String reverseValue = stringBuilder.reverse().toString();

if (originalValue.equals(reverseValue)) System.out.println("Palindrome");

Answer 2

解決方案：

public class Test {

    public static void main(String[] args) {
        Random number = new Random();
        int value = number.nextInt(1000);
        System.out.println("Original number : " + " " + value);
        int tmp = value;
        int result = 0;
        while (tmp != 0) {
            result = result * 10 + (tmp % 10);
            tmp = tmp / 10;
        }
        System.out.println("Reversed Number : " + " " + result);
        if (result != value) {
            System.out.println("Not Palindrome");
        } else {
            System.out.println("Palindrome");
        }

    }

}

謝謝 ：）

Answer 3

您的代碼幾乎可以了，只是您要更新的初始隨機數不是您想要的。 為了盡量減少對代碼的更改，我建議您添加一個新變量，並將其與反向算法的結果進行比較。

import java.util.Random;

public class Loop6 {
    public static void main(String[] args) {

        Random number = new Random();
        int randomNumber = number.nextInt(1000);  // introduce the initial variable
        int value = randomNumber;  // introduce the variable that will be updated
        System.out.println("random number : " + " " + value);

        int rev = 0;
        int dig;

        while (value > 0) {
            dig = value % 10;
            rev = rev * 10;
            rev = rev + dig;
            value = value / 10;
        }
        System.out.println("rev is : " + "" + rev);
        if (randomNumber == rev) {  // compare the initial variable and the reverse result
            System.out.println("Palindrome");

        }

    }
}