Java I/O :

Java I/O (Input and Output) is used to process the input and produce the output.

Java uses the concept of stream to make I/O operation fast. The java.io package contains all the classes required for input and output operations.

We can perform file handling in java by Java I/O API.

Stream

A stream is a sequence of data.In Java a stream is composed of bytes. It's called a stream because it is like a stream of water that continues to flow.

In java, 3 streams are created for us automatically. All these streams are attached with console.

1) System.out: standard output stream

2) System.in: standard input stream

3) System.err: standard error stream

Let's see the code to print output and error message to the console.

System.out.println("simple message");
System.err.println("error message");

Let's see the code to get input from console.

int i=System.in.read();//returns ASCII code of 1st character
System.out.println((char)i);//will print the character

(Reading a text file data click here )http://javadevelopmenttricks.blogspot.in/2018/02/java-fileinputstream-class.html

(writing data to a text file click here)http://javadevelopmenttricks.blogspot.in/2018/02/java-fileoutputstream-class.html

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Java I/O

Java I/O :

Stream