异常：java.util.ConcurrentModificationException

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异常：java.util.ConcurrentModificationException 在Map或者Collection的时候，不要用它们的API直接修改集合的内容，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为Collection Reparation repa = (Reparation)it.next(); if (repa.getId() == reparation.getId()){ this.reparations.remove(repa); this.reparations.add(reparation); } } } 如上写会在运行期报ConcurrentModificationException，可以如下修改： public void setReparation( Reparation reparation ) { boolean flag = false; for (Iterator it = this.reparations.iterator();it.hasNext();){ //reparations为Collection Reparation repa = (Reparation)it.next(); if (repa.getId() == reparation.getId()){ it.remove(); flag = true; break; } } if(flag){ this.reparations.add(reparation); } } 具体可以参考：http://gceclub.sun.com.cn/yuanchuang/week-14/iterator.html

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