直接内存 Direct Memory
int BUFFER = 1024*1024*1024; // 1GB
ByteBuffer byteBuffer = ByteBuffer.allocateDirect(BUFFER);非直接缓存区和缓存区

存在的问题

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int BUFFER = 1024*1024*1024; // 1GB
ByteBuffer byteBuffer = ByteBuffer.allocateDirect(BUFFER);

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