Java求最长回文子串

public class Main3 {
    public static void main(String[] args) {
        String str = "abaabc";
        int lenMax = 1;
        int begin=0;
        //从0开始为了保证“bb”这种情况
        for (int i = 0; i < str.length(); i++) {
            int curMax = Math.max(maxLengthStr(str, i, i), maxLengthStr(str, i, i + 1));
            if (curMax > lenMax) {
                lenMax = curMax;
                //最长子串的头位置下标
                begin = i-(curMax-1)/2;
            }
        }
        System.out.println("-------------------------------------");
        System.out.println(lenMax);
        System.out.println(str.substring(begin,begin+lenMax));
        System.out.println("-------------------------------------");
    }
   
  	public static int maxLengthStr(String str, int i, int j) {
        while (i => 0 && j < str.length() && str.charAt(i) == str.charAt(j)) {
            i--;
            j++;
        }
        return j - i - 1;
    } 
}