How to use output:
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System.out.println("Welcome");
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System.out.println("Welcome: " + userName);
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System.out.println("Total: " + invoiceTotal);
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System.out.println("\n");
How to use input:
Introduced in Java 1.5 was the Scanner class.
Each entry that a user makes is called a token. A user can input two or more tokens by separating them with whitespace.
import java.util.Scanner
Scanner sc = new Scanner(System.in);
String user = sc.next();
int count = sc.nextInt();