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public static void main(String[] args) {
// TODO Auto-generated method stub
String[] strs = {"abcdef","ab.cb,a","a9(2fty","xy.jk3,#fdsa"};
String temp;
String pre,after;
int length;
for(String s:strs){
temp = s.replaceAll("\\W", "").toLowerCase();
length = temp.length();
if((length & 1)==0){
pre = temp.substring(0,length/2);
after = temp.substring(length/2, length);
}else{
pre = temp.substring(0,length/2);
after = temp.substring(length/2+1, length);
}
if(pre.equals((new StringBuffer(after).reverse()).toString())){
System.out.println(s+"是回文");
}else{
System.out.println(s+"不是回文");
}
}
}
abcdef不是回文
ab.cb,a是回文
a9(2fty不是回文
xy.jk3,#fdsa不是回文
public class Test{
public static void main(String args[]) throws Exception{
String[] strs={"aaBBAa","abcba.","xy,12.21[Yx]","abcabc"};
for(String str: strs){
if(isPalindrome(str)){
System.out.println(str+"是回文的");
}else{
System.out.println(str+"不是回文的");
}
}
}
public static boolean isPalindrome(String str){
String newStr=str.replaceAll("\\W",""); //把非字母和数字的其它字符去掉.
newStr=newStr.toLowerCase(); //把字符串转为小写.
int start=0;
int end=newStr.length()-1;
while(start<end&&newStr.charAt(start++)==newStr.charAt(end--));
if(start<end){
return false;
}
return true;
}
}