java中ArrayList使用remove注意事项

1、java中ArrayList使用remove注意事项/在remove一条信息时，ArrayList的大小已经改变(即list.size()已经改变)；在i大于等于list.size()时，循环跳出，后便的ArrayList不能再执行；所以必须在remove的同时，执行i-，即i=i-1；现在才能遍历所有List中的信息。也不能在用Iterator遍历时使用remove,会抛异常。publicclassTrickyALpublicstaticLinkedList<User>llu=newLinkedList<User>();publicst

2、aticHashMap<String,User>hmu=newHashMap<String,User>();publicstaticArrayList<User>ulist=newArrayList<User>(Arrays.asList(newUsernewUser(2,"Eric"),newUser(3,"Eric"),newUser(1,"Aaron"),newUser(4,"Eric");stat

3、icllu.add(newUser(1,"Aaron");llu.add(newUser(2,"Eric");llu.add(newUser(3,"Tom");hmu.put("1",newUser(3,"Tom");hmu.put("2",newUser(2,"Eric");hmu.put("3",newUser(1,"Leo");hmu.put("3",newUser(4,"Scot

4、t");publicstaticvoiddeleteUser(ArrayList<User>urlist,Stringauser)for(inti=0;i<c;i+)i-;c-;publicstaticvoiddeleteUser(LinkedList<User>urlist,Stringauser)for(inti=0;i<c;i+)i-;c-;publicstaticvoiddeleteUser(HashMap<String,User>urlist,Stringause

5、r)intc=urlist.size();Iteratorhmi=urlist.entrySet().iterator();Stringks=""for(Stringsk:urlist.keySet()if(auser.equals(urlist.get(sk).name)System.out.println(auser);ks=sk;break;urlist.remove(ks);publicstaticvoidmain(Stringargs)/TODOAuto-generatedmethodstub/ArrayListmul=(ArrayList)ulist;Syste

6、m.out.println(ulist);/deleteUser(ulist,"Eric");/Arrays.sort(ulist.toArray();System.out.println(ulist);System.out.println("2->"+llu);Collections.reverse(llu);deleteUser(llu,"Eric");System.out.println(llu);System.out.println("3->"+hmu);deleteUser(hmu,"Eric");System.out.println(hmu);Collections.copy(ulist,llu);System.out.println(ulist);System.out.println(llu);publicstaticclassUserpublicintid;publicStringname;publicUser(intid,Stringna