在Map或者Collection的時(shí)候，不要用它們的API直接修改集合的內(nèi)容，如果要修改可以用Iterator的remove()方法，例如：

    public void setReparation( Reparation reparation ) {
        for (Iterator it = this.reparations.iterator();it.hasNext();){    //reparations為Collection
            Reparation repa = (Reparation)it.next();
            if (repa.getId() == reparation.getId()){
                this.reparations.remove(repa);
                this.reparations.add(reparation);
            }
        }
   }

如上寫會在運(yùn)行期報(bào)ConcurrentModificationException，可以如下修改：

    public void setReparation( Reparation reparation ) {
        boolean flag = false;
        for (Iterator it = this.reparations.iterator();it.hasNext();){    //reparations為Collection
            Reparation repa = (Reparation)it.next();
            if (repa.getId() == reparation.getId()){
                it.remove();
                flag = true;
                break;
            }
        }
        if(flag){
          this.reparations.add(reparation);
        }
    }

具體可以參考：http://gceclub./yuanchuang/week-14/iterator.html