Square brackets denote a numerically indexed array.

方括号表示数字索引数组。

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JSONArray represents an indexed array, so its put method takes only a value.

JSONArray代表索引数组，所以它的put方法只接受一个值。

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The accumulate method is like put except that it appends its value to an indexed array identified by the key.

accumulate方法与put类似，区别在于它把值添加到按照键进行识别的索引数组。

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