Java Scanner Class Flashcards

Study Notes

Java Scanner Class Overview

Scanner scnr = new Scanner(System.in); initializes a new Scanner object named scnr for reading input from the console.
fullName = scnr.nextLine(); captures the next line of input as a String, storing it in the variable fullName.
age = scnr.nextInt(); retrieves the next integer input from the user and assigns it to the variable age.

Key Concepts

The Scanner class is a part of java.util package and it simplifies keyboard input handling in Java applications.
System.in serves as the standard input stream connected to the console, allowing interaction via keyboard input.
The operator new is used to create and instantiate new objects in Java, allocating memory on the heap for those objects.

Scanner Functionality

The next() method reads the next input token as a String, which is ideal for single word inputs, separating them based on whitespace.
A package in Java is a namespace that organizes a set of related classes and interfaces, facilitating code management.

Basic Structure

The snippet public class first { public static void main(String[] args) { illustrates the structure for defining a new class and the entry point of a Java program.
To utilize the Scanner class in a program, the statement import java.util.Scanner; must be included at the beginning of the code to import the required class.

Additional Information

A Scanner instance is necessary for scanning various types of input, including Strings, integers, and more, through specific methods provided by the class.
Understanding memory allocation and class structure is crucial for effective Java programming, particularly when working with input handling.

Description

Test your knowledge of the Java Scanner class with these flashcards. Each card covers important definitions and example usage of the Scanner methods to read various data types. Perfect for beginners looking to master input handling in Java!