Day-7. IO Package Introduction. FileInputStream and FileOutputStream example.
In Java, InputStream and OutputStream are part of the java.io package and are fundamental for handling input and output operations. Imagine them as pipelines that allow data to flow into or out of your program.
InputStream is used for reading data, and OutputStream is used for writing data. They are abstract classes, meaning you can't create instances of them directly. Instead, you use their concrete subclasses for specific types of input or output.
For example, if you want to read data from a file, you'd use FileInputStream, which is a subclass of InputStream. Conversely, if you want to write data to a file, you'd use FileOutputStream, a subclass of OutputStream.
InputStream provides methods like read(), which reads a single byte of data, and read(byte[] b), which reads an array of bytes. You might use these methods when, for instance, you're reading data from a file or a network.
On the other hand, OutputStream has methods like write(int b), which writes a byte of data, and write(byte[] b), which writes an array of bytes. This is handy when you want to output data, say, to a file or a network socket.
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