java实现100以内质数

class zhishu(){

   for(int i= 1; i < 100; i++){
           boolean  flag = true;
            for(int j=0; j < i; j++){
               if(i%j =0 ){
                 flag = false;
               }
               if(flag){
                  System.out.print(i + "");
              }
           }
  }
}