Working with Java I/O
I/O deals with reading data from a source and writing data to a destination. These are some of the most common activities that programs do. Source and destination are very broad concepts. You could read from a file or a keyboard and display data on a monitor. You could read from a database and write to an API serving data. Java provides classes for many sources and destinations for reading and writing data.
In this topic, we will look at the most common I/O cases:
- Reading and writing to a file
- Reading from a keyboard and writing to a monitor
We have already worked with I/O without realizing it. Whenever we start the REPL and type on the keyboard, we perform write operations. Similarly, all function calls in the REPL print to the monitor, performing output operations.
I/O is a huge and difficult topic. Even the people that created Java did not get it right in the beginning, as we can see from the number of classes and packages for I/O....
