Explain ways Scanner class create objects that can input data from the three types of input sources. Give 3 examples of the use of Scanner objects. Describe 1 Scanner method

Question

Explain the ways in which the Scanner class can be used to create objects that can input data from the three types of input sources.

Give 3 examples of the use of Scanner objects. 

Describe 1 Scanner method that can be used to prevent run time exceptions.

Answer 1

Input is read typically from disk file, keyboard, or from hardware device.

Scanner scanner = new Scanner(System.in); // establishes keyboard input

Your last program did file input...

Device I/O can be Serial, via RS232 or RJ45 connection, or via Internet SOCKETS.