去除List中重复数据

//去除List中重复数据           for(int i=0;i<xxlist_print.size()-1;i++){          Xxk xxk_i=(Xxk) xxlist_print.get(i);          long xxk_i_xxkid=xxk_i.getXxid();          for(int j=xxlist_print.size()-1 ;j>i;j--){             Xxk xxk_jj=(Xxk) xxlist_print.get(j);          long xxk_jj_xxkid=xxk_jj.getXxid();              if(xxk_i_xxkid == xxk_jj_xxkid){               xxlist_print.remove(xxk_jj);                 }         }              }