package test;import java.util.Stack;
/** * 查找最大回文字串 *
* @author Administrator *
*/
public class FindMaxRoundString {
public static void main(String[] args) {
System.out.println(findMaxRoundString("ababcbadd1234321d"));
}
public static String findMaxRoundString(String source) {
int maxRoundStrLength = 0; // 当前检测到的最大回文
String maxRoundStr="";
String tempStr;
for (int i = 0; i < source.length(); i++) {
if (source.length() - i > maxRoundStrLength) {
for (int j = i + 1; j <= source.length(); j++) {
tempStr = source.substring(i, j);
if (checkIsRound(tempStr)) {
if(tempStr.length()>maxRoundStrLength) {
maxRoundStr = tempStr;
maxRoundStrLength = tempStr.length();
}
}
}
}
}
return maxRoundStr;
}
public static boolean checkIsRound(String str) {
Stackstack = new Stack();
char[] chars = str.toCharArray();
for (int i = 0; i < str.length(); i++) {
stack.push(String.valueOf(chars[i]));
}
StringBuffer dest = new StringBuffer();
while (!stack.isEmpty()) {
dest.append(stack.pop());
}
return str.equals(dest.toString());
}
}
输出：d1234321d
