【单选题】【消耗次数:1】
下列哪些语句关于Java内存回收的说明是正确的? ( )
程序员必须创建一个线程来释放内存
内存回收程序负责释放无用内存
内存回收程序允许程序员直接释放内存
内存回收程序可以在指定的时间释放内存对象
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