字符串压缩

例：
aabbbcc -> a2b3c2
abccc -> abc3

import static com.myutils.Print.*;

public class Test {
    public static String fun(String in){
        String out = new String();
        char last = 1;
        int cnt = 1;
        for(int i=0;i<in.length();i++){
            char c = in.charAt(i);
            if(c!=last){
                if(cnt>1){
                    String tmp = Integer.toString(cnt);
                    out = out.concat(tmp);
                }

                cnt=1;
                String tmp = Character.toString(c);
                out = out.concat(tmp);
                last = c;
            }else{
                cnt++;
            }

        }
        if(cnt>1){
            String tmp = Integer.toString(cnt);
            out = out.concat(tmp);
        }
        return out;

    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println(fun("abbc"));
    }

}