案例：
![将List<int[]>转换为int[][]](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTlwYldjeU1ESXdMbU51WW14dlozTXVZMjl0TDJKc2IyY3ZPRFF5TnpJMEx6SXdNakF3TXk4NE5ESTNNalF0TWpBeU1EQXpNakl4TnpNek1URTNNVGd0TVRJeE9EZzVPVEk0TUM1d2JtYz0= "将List<int[]>转换为int[][]")
查看源代码：
-
从源代码看出输入的参数小于List的大小则依旧会创建与列表大小相同的数组返回，相当于只获得传入的类型
![将List<int[]>转换为int[][]](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTlwYldjeU1ESXdMbU51WW14dlozTXVZMjl0TDJrdFltVjBZUzg0TkRJM01qUXZNakF5TURBekx6ZzBNamN5TkMweU1ESXdNRE15TWpFM016WXpPREl4TUMwNE9UTTNNall3TURRdWNHNW4= "将List<int[]>转换为int[][]")
对此我们以后在不知道大小的情况下将List<T>很容易转换为T[]数组：
![将List<int[]>转换为int[][]](/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTlwYldjeU1ESXdMbU51WW14dlozTXVZMjl0TDJrdFltVjBZUzg0TkRJM01qUXZNakF5TURBekx6ZzBNamN5TkMweU1ESXdNRE15TWpFM05EWXhNelEzTlMweE9UYzJPRE0wTmpNdWNHNW4= "将List<int[]>转换为int[][]")
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