Question

Consider the following code segment:

Scanner scan = new Scanner(System.in);

What does this code segment do?

Answer 1

The code segment 'Scanner scan = new Scanner(System.in);' creates a Scanner object to read input from the user through the keyboard.

Step-by-step explanation:

The code segment 'Scanner scan = new Scanner(System.in);' is used to create a Scanner object that reads input from the user through the keyboard. The Scanner class is part of the Java.util package and provides various methods to read different types of input, including integers, floating-point numbers, and strings. The 'System.in' argument passed to the Scanner constructor indicates that the input will be read from the standard input stream, which is typically the keyboard.

For example, if you want to read an integer input from the user, you can use the 'nextInt()' method of the Scanner object created. Specifically, System.in is a standard input stream that provides input data that the user types into the console. By instantiating a Scanner with System.in, the code is setting up a way to interpret and fetch user input in a program, allowing the program to react based on what the user types.