两个字符串的最大公共子字符串

/*
 * 两个字符串的最大子字符串
 */
public class maxSubString {
    public static void main(String[] args){
        String str1 = "abcdefgh";
        String str2 = "dbcdefjjj";
        System.out.println(findSubString(str1, str2));
    }

    public static String findSubString(String str1, String str2){
        char[] arr1 = str1.toCharArray();
        char[] arr2 = str2.toCharArray();

        int len1 = arr1.length;
        int len2 = arr2.length;
        int[][] tmp = new int[len1][len2];

        int maxLength = ;
        int endIndex=;

        for(int i = ; i < len1; i++)
        {
            if(arr1[i] == arr2[]) tmp[i][] = ;
            else tmp[i][] = ;
        }

        for(int j = ; j < len2; j++){
            if(arr1[] == arr2[j]) tmp[][j] = ;
            else tmp[][j] = ;
        }

        for(int i = ; i < len1; i++){
            for(int j = ; j < len2; j++){
                if(arr1[i] == arr2[j]){
                    tmp[i][j] = tmp[i-][j-] +;
                    if(tmp[i][j] > maxLength){
                        maxLength = tmp[i][j];
                        endIndex  =j;
                    }                   
                }
                else
                    tmp[i][j] = ;
            }                       
        }       
        String result = str2.substring(endIndex-maxLength+, endIndex+);
        return result;
    }
}