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import java.util.Scanner;/*** 回文数:一种数字,如:12321, 这个数字正读是12321,倒读也是12321,* 即:将这个数的数字按相反的顺序重新排列后,所得到的数和原来的数一样。* Created by Administrator on 2017/6/23.*/
public class HuiWenTest {public static void main(String[] args) {Scanner in = new Scanner(System.in);String input = in.next();if (input.matches("\\d+")) {//方法1 使用数组翻转ArrayCharArray(input);//方法2 使用StringBuffer reverse方法StringBufferReverse(input);//方法3 使用首尾对应比较isPalindrome(input);//方法4 数字反转checkHWS(input);//方法5 字符串倒置一一比较getHuiWen(input);//方法6 使用截取字符串的方式比较getHuiWenShu(input);//方法7 字符串首尾对比getHuiWen2(input);}}/*---------------------------------------------------------------*/private static void getHuiWen2(String input) {boolean b = true;for (int i = 0; i < input.length() / 2; i++) {if (input.charAt(i) != input.charAt(input.length() - i - 1)) {b = false;break;}}System.out.println("方法7==" + input + (b ? "是" : "不是") + "回文数");}/*---------------------------------------------------------------*/private static void getHuiWenShu(String input) {int count = 0;for (int i = 0; i < input.length() / 2; i++) {if ((input.substring(i, i + 1)).equals(input.substring(input.length() - 1 - i, input.length() - i))) {count++;}}if (count == input.length() / 2) {System.out.println("方法6===是回文字符串");} else {System.out.println("方法6===不是回文字符串");}}/*---------------------------------------------------------------*///将字符串倒置后逐一比较private static void getHuiWen(String input) {StringBuffer sb = new StringBuffer(input);sb.reverse();// 将Str中的字符串倒置int count = 0;for (int i = 0; i < input.length(); i++) {if (input.charAt(i) == sb.charAt(i)) {count++;}}if (count == input.length()) {System.out.println("方法5==此字符串是一个回文字符串");} else {System.out.println("方法5==此字符串不是一个回文字符串");}}/*---------------------------------------------------------------*///判断一个数是否为回文数public static boolean checkHWS(String inputString) {int input = Integer.parseInt(inputString);int reverse = 0, temp = input;while (temp > 0) {reverse = reverse * 10 + temp % 10;temp = temp / 10;}if (input == reverse) {System.out.println("方法4==" + input + "是回文数!");return true;}System.out.println("方法4==" + input + "不是回文数!");return false;}private static boolean isPalindrome(String input) {int begin = 0, end = input.length() - 1;char[] chars = input.toCharArray();while (begin < end) {if (chars[begin] == chars[end]) {begin++;end--;} else {System.out.println("方法3 ==" + input + "不是回文数!!!");return false;}}System.out.println("方法3 ==" + input + "是回文数!!!");return true;}/*---------------------------------------------------------------*/private static boolean ArrayCharArray(String input) {char[] nums = input.toCharArray();String output = "";for (int i = nums.length; i > 0; i--) {output += nums[i - 1];}System.out.println("方法1 ==input==" + input);System.out.println("方法1 ==output==" + output);if (output.equals(input)) {System.out.println("方法1 ==" + input + "是回文数!!!");return true;}System.out.println("方法1 ==" + input + "不是回文数!!!");return false;}/*---------------------------------------------------------------*/private static boolean StringBufferReverse(String input) {StringBuffer sbInput = new StringBuffer(input);StringBuffer sbReverse = sbInput.reverse();String output = sbReverse.toString();//转成字符串System.out.println("方法2 ==input==" + input);System.out.println("方法2 ==output==" + output);if (input.equals(output)) {System.out.println("方法2 ==" + input + "是回文数!!!");return true;}System.out.println("方法2 ==" + input + "不是回文数!!!");return false;}}
参考:
java判断回文字符串的几种方法