试图找到最大的回文，变量没有更新[重复](Trying to find largest palindrome, variable not updated [duplicate])

这个问题在这里已有答案：

如何比较Java中的字符串？ 23个答案

所以我试图找到2个3位数字的最大产品，这是一个回文。这是我的代码：

class project_euler4 { public static int largest_palindrome = 0; public static boolean isPalindrome(int number) { String original = Integer.toString(number); String reversed = new StringBuffer(original).reverse().toString(); return (original == reversed) ? true : false; } public static void main(String[] args) { for (int i = 100; i < 1000; i++) { for (int j = 100; j < 1000; j++) { int candidate = i * j; if (isPalindrome(candidate) && candidate > largest_palindrome) { largest_palindrome = candidate; } } } System.out.println("The largest palindrome made from the product of 2 3-digit numbers is " + largest_palindrome); } }

当我编译并运行时，我得到：

The largest palindrome made from the product of 2 3-digit numbers is 0

因此，出于某种原因，当产品是回文时，我的largest_palindrome变量没有得到更新。我怀疑它与我的isPalindrome（）函数有关，但我不确定。

有任何想法吗？

感谢Mariogs的帮助

This question already has an answer here:

How do I compare strings in Java? 23 answers

So I'm trying to find the largest product of 2 3-digit numbers that is a palindrome. Here's my code:

class project_euler4 { public static int largest_palindrome = 0; public static boolean isPalindrome(int number) { String original = Integer.toString(number); String reversed = new StringBuffer(original).reverse().toString(); return (original == reversed) ? true : false; } public static void main(String[] args) { for (int i = 100; i < 1000; i++) { for (int j = 100; j < 1000; j++) { int candidate = i * j; if (isPalindrome(candidate) && candidate > largest_palindrome) { largest_palindrome = candidate; } } } System.out.println("The largest palindrome made from the product of 2 3-digit numbers is " + largest_palindrome); } }

When I compile and run, I get:

The largest palindrome made from the product of 2 3-digit numbers is 0

So for some reason, my largest_palindrome variable isn't getting updated when a product is a palindrome. I suspect it has something to do with my isPalindrome() function, but am not sure.

Any ideas?

Thanks for the help, Mariogs