英文:
add() method keeps writing the same object at all the indices in the ArrayList
问题
我希望每当我的程序通过for循环时，都能填充我的列表；然而，相同的数据被写入了所有的索引。Integer nunAcc = JsonPath.read(obj, "$.['Account List'].length()");JsonCharacter jChar = new JsonCharacter();List<JsonCharacter> itemList = new ArrayList<>();for(int i=0; i < nunAcc; i++) {jChar.email = JsonPath.read(obj, "$.['Account List'][" + i + "].email");jChar.password = JsonPath.read(obj, "$.['Account List'][" + i + "].password");jChar.characterName = JsonPath.read(obj, "$.['Account List'][" + i + "].character");itemList.add(jChar);}
英文:
I want to fill my list always when my program goes through the for loop; however, the same data is written at all indices.
Integer nunAcc = JsonPath.read(obj, "$.['Account List'].length()");JsonCharacter jChar = new JsonCharacter();List<JsonCharacter> itemList = new ArrayList<>();for(int i=0; i < nunAcc; i++) {jChar.email = JsonPath.read(obj, "$.['Account List'][" + i + "].email");jChar.password = JsonPath.read(obj, "$.['Account List'][" + i + "].password");jChar.characterName = JsonPath.read(obj, "$.['Account List'][" + i + "].character");itemList.add(jChar);}
答案1
得分: 1
这样做：JsonCharacter jChar = new JsonCharacter();// ...for(int i=0; i < nunAcc; i++) {// 更新 jChar...itemList.add(jChar);}会重复地更新然后将相同的实例添加到列表中。在每次迭代中创建一个新的 `jChar` 实例：for(int i=0; i < nunAcc; i++) {JsonCharacter jChar = new JsonCharacter();// 更新 jChar...itemList.add(jChar);}
英文:
This:
JsonCharacter jChar = new JsonCharacter();// ...for(int i=0; i < nunAcc; i++) {// Update jChar...itemList.add(jChar);}
is updating then adding the same instance to the list repeatedly.
Create a new instance of jChar on each iteration:
for(int i=0; i < nunAcc; i++) {JsonCharacter jChar = new JsonCharacter();// Update jChar...itemList.add(jChar);}
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