Java 控制台对字符串的处理

public static void main(String[] args) {
    String rst="";
    List<String> list=new ArrayList<String>();
    List<String> lists=new ArrayList<String>();
    Scanner scanner=new Scanner(System.in);
    String nextLine=scanner.nextLine();
    while (nextLine != null && !nextLine.equals("")) {
        list.add(nextLine);
        nextLine = scanner.nextLine();
    }

    if(list.size()<2){
        System.exit(0);
    }else if(list.size()==2)
    {
        System.out.println(list.get(1));
    }else{
        int count=Integer.valueOf(list.get(0));
        String tmp="";
        int ma[]=new int[list.size()-1];
        int maxcount=0;
        for(int i=1;i<list.size();i++){
            String str=list.get(i);
            String a[]=str.split(",");
            Double len=Math.ceil((double)a.length/count);
            ma[i-1]=len.intValue();
        }
        maxcount=ma[0];
        for(int x =1;x<ma.length;x++){
            if(ma[0]<ma[x]){
                maxcount=ma[x];
            }
        }
        list.remove(0);
        while(maxcount!=0&&list.size()>0){
            maxcount--;
            lists=new ArrayList<String>();
            for(int i=0;i<list.size();i++){
                String str=list.get(i);
                String a[]=str.split(",");
                if(a.length>count){
                    tmp="";
                    for(int j=0;j<count;j++){
                        rst+=a[j]+",";
                    }
                    for(int j=count;j<a.length;j++){
                        tmp+=a[j]+",";
                    }
                    lists.add(tmp);
                }else{
                    for(int j=0;j<a.length;j++){
                        rst+=a[j]+",";
                    }
                }
            }
            list=lists;
        }
        System.out.println(rst.substring(0,rst.length()-1));
    }

}