barcode reader input or output

The so-called IO, which is the abbreviation of input and output. In Java, IO involves a relatively large scope, which focuses on reading and writing about file content Other knowledge points will be placed in subsequent chapters (I think, the article is too long, no one has the patience to turn to the end) the operation of the contents of the file is mainly divided into two categories respectively: 　　

read (). When there is no resource, it will be blocked and almost no resource is occupied.The close () method is not redundant for JAVA garbage collectors, because when an InputStream object is created, some resources will be generated in the operating system, but the garbage collector can only recycle object garbage. 4. OutputStream classThree write () methods.Flush () writes data to the buffer immediatelyClose () writes data to the buffer and closes 5. FileInputStream and FileOutputStreamWhen

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