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    //在remove一條信息時(shí)，
　　ArrayList的大小已經(jīng)改變（即list.size()已經(jīng)改變）；
　　在i大于等于list.size()時(shí)，循環(huán)跳出，后便的ArrayList不能再執(zhí)行；
　　所以必須在remove的同時(shí)，執(zhí)行i--，即i=i-1；
　　現(xiàn)在才能遍歷所有List中的信息。也不能在用Iterator遍歷時(shí)使用remove,會(huì)拋異常。
public class TrickyAL {

    
    publicstatic LinkedList<User> llu=newLinkedList<User>();
    publicstatic HashMap<String,User> hmu=newHashMap<String,User>();
    publicstatic ArrayList<User> ulist=newArrayList<User>(Arrays.asList
    (newUser[]{
      
      new User(2,"Eric"),
      new User(3,"Eric"),
      new User(1,"Aaron"),
      new User(4,"Eric")
    
    }
    ));
   static{
      llu.add(new User(1,"Aaron"));
      llu.add(new User(2,"Eric"));
      llu.add(new User(3,"Tom"));
      hmu.put("1",new User(3,"Tom"));
      hmu.put("2",new User(2,"Eric"));
      hmu.put("3",new User(1,"Leo"));
      hmu.put("3",new User(4,"Scott"));
      
      
    }
    publicstatic voiddeleteUser(ArrayList<User>urlist,String auser){
      
      Iterator itr=urlist.iterator();
      int c=urlist.size();
      
      for(int i=0;i<c;i++){
         if(auser.equals(urlist.get(i).name)){
            urlist.remove(i);
            i--;
            c--;
         }
      }
      
      
    }
public static voiddeleteUser(LinkedList<User>urlist,String auser){
      
      Iterator itr=urlist.iterator();
      int c=urlist.size();
      
      for(int i=0;i<c;i++){
         if(auser.equals(urlist.get(i).name)){
            urlist.remove(i);
            i--;
            c--;
         }
      }
      
      
    }
public static voiddeleteUser(HashMap<String,User>urlist,String auser){
    
    
    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);
    
    
    
}
    publicstatic void main(String[] args) {
      // TODO Auto-generated method stub
      //ArrayList mul=(ArrayList)ulist;
      System.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);
    }

    publicstatic class User{
      public int id;
      public String name;
      public User(int id,String name){
         this.id=id;
         this.name=name;
      }
      public String toString(){
         returnString.valueOf(this.id)+","+this.name;
      }
      
    }
}