找出两个字符串中最长的相同子字符串

//找出两个字符串中最长的相同子字符串

public class Stringdemo {
    public static void main(String[] args) {

        String str1 = new String("eeabcde");
        String str2 = new String("bcdefabcabcdedegg");
        byte[] char1 = str1.getBytes();
        byte[] char2 = str2.getBytes();
        int len1 = char1.length;
        int len2 = char2.length;
        String maxchar=new String("");
        StringBuffer temp = new StringBuffer(" ");
        int maxl = 0;
        int loops = 0;
        for(int i=0;i<len1;i++)
            for(int j=0;j<len2;j++){
                int pos1 = i;
                int pos2 = j;
                int l = 0;
                //temp = new StringBuffer("");
                temp.delete(0, temp.length());
                while(char1[pos1]==char2[pos2]) {
                    l++;
                    temp.append((char)char1[pos1]);
                    if (++pos1>len1-1) break;
                    if (++pos2>len2-1) break;
                }
                //System.out.println(""+(++loops)+":"+temp);
                if (l>maxl) {
                    maxl = l;
                    maxchar = temp.toString();

                }
            }
        System.out.println(""+maxl+" "+maxchar);
    }
}