如何在Java中检查一个数字是否是回文？
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How to check if a number is palindrome in Java?
提问by Leo Lee
I am new in Java and I need to complete this program to check if an integer is palindrome. Please help.
我是 Java 新手，我需要完成这个程序来检查一个整数是否是回文。请帮忙。
public static void main(String args[]){
System.out.println("Please enter an integer : ");
int integer = new Scanner(System.in).nextInt();
if(isPalindrome(integer)){
System.out.println(integer + " is a palindrome");
}else{
System.out.println(integer + " is not a palindrome");
}
}
采纳答案by Sky
public static boolean isPalindrome(int integer) {
int palindrome = integer;
int reverse = 0;
// Compute the reverse
while (palindrome != 0) {
int remainder = palindrome % 10;
reverse = reverse * 10 + remainder;
palindrome = palindrome / 10;
}
// The integer is palindrome if integer and reverse are equal
return integer == reverse; // Improved by Peter Lawrey
}
Advanced solution: (Provided by Shadov)
高级解决方案：（Shadov 提供）
public static boolean isPalindrome(int integer) {
String intStr = String.valueOf(integer);
return intStr.equals(new StringBuilder(intStr).reverse().toString());
}
Reference: http://www.java67.com/2012/09/palindrome-java-program-to-check-number.html#ixzz4emXfiD7V
参考：http: //www.java67.com/2012/09/palindrome-java-program-to-check-number.html#ixzz4emXfiD7V
Please do not just put up question without your work next time.
下次请不要在没有工作的情况下提出问题。
回答by Hello Kitty
public static boolean isPalindrome(int number) {
int palindrome = number; // copied number into variable
int reverse = 0;
while (palindrome != 0) {
int remainder = palindrome % 10;
reverse = reverse * 10 + remainder;
palindrome = palindrome / 10;
}
// if original and reverse of number is equal means
// number is palindrome in Java
if (number == reverse) {
return true;
}
return false;
}
Source: http://www.java67.com/2012/09/palindrome-java-program-to-check-number.html#ixzz4emXfiD7V
来源：http: //www.java67.com/2012/09/palindrome-java-program-to-check-number.html#ixzz4emXfiD7V
But you need to clearly not put up homework questions here.
但是你需要明确不要在这里提出家庭作业问题。
