ArrayList要素削除同時異常C o n c u r r r e ntModificationExceptionソリューション
3453 ワード
/ 1 Iterator remove ， for (Iterator it = myList.iterator(); it.hasNext();) { String value = it.next(); if (value.equals( "3" )) { it.remove(); // ok } } System. out.println( "List Value:" + myList.toString()); // 2 ， ， List templist = new ArrayList(); for (String value : myList) { if (value.equals( "3" )) { templist.remove(value); } } // removeAll ， Iterator myList.removeAll(templist); System. out.println( "List Value:" + myList.toString()); // 3. CopyOnWriteArrayList List myList = new CopyOnWriteArrayList(); myList.add( "1" ); myList.add( "2" ); myList.add( "3" ); myList.add( "4" ); myList.add( "5" ); Iterator it = myList.iterator(); while (it.hasNext()) { String value = it.next(); if (value.equals( "3" )) { myList.remove( "4" ); myList.add( "6" ); myList.add( "7" ); } } System. out.println( "List Value:" + myList.toString()); // 4. Iterator ， for ( int i = 0 ; i < myList.size(); i++) { String value = myList.get(i); System. out.println( "List Value:" + value); if (value.equals( "3" )) { myList.remove(value); // ok i--; // ， i } } System. out.println( "List Value:" + myList.toString());