import java.nio.file.DirectoryStream.Filter;
import javax.swing.JOptionPane;
public class PalindromeIgnoreNonAlphanumeric {
public static void main(String[] args) { // TODO Auto-generated method stub String s=JOptionPane.showInputDialog("Enter a string:"); String output="Ignoring nonalphanumeric characters,/nis" +s+"a palindrome?" +isPalindrome(s); JOptionPane.showMessageDialog(null, output);}//判讀是否是回文串public static boolean isPalindrome(String s){ String s1=filter(s);//去除非字母和數字 String s2=reverse(s1);//字符串反轉 return s2.equals(s1);}public static String filter(String s){ StringBuffer strBuf=new StringBuffer(); for(int i=0;i<s.length();i++) { if(Character.isLetterOrDigit(s.charAt(i))){ strBuf.append(s.charAt(i)); } } return strBuf.toString();}public static String reverse(String s){ StringBuffer stringBuffer=new StringBuffer(s); stringBuffer.reverse(); return stringBuffer.toString();}}
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