Basic Input

Java Input

There are several ways to get input from the user in Java. You will learn to get input by using Scanner object in this article.

For that, you need to import Scanner class using:

import java.util.Scanner;

Learn more about Java import

Then, we will create an object of Scanner class which will be used to get input from the user.

Scanner input = new Scanner(System.in);
int number = input.nextInt();

Example: Get Integer Input From the User

import java.util.Scanner;

class Input {
    public static void main(String[] args) {
    	
    	Scanner input = new Scanner(System.in);
    	
    	System.out.print("Enter an integer: ");
    	int number = input.nextInt();
    	System.out.println("You entered " + number);
    }
}

When you run the program, the output will be:

Enter an integer: 23
You entered 23

Here, input object of Scanner class is created. Then, the nextInt() method of the Scannerclass is used to get integer input from the user.

To get long, float, double and String input from the user, you can use nextLong(), nextFloat(), nextDouble() and next() methods respectively.

Example: Get float, double and String Input

import java.util.Scanner;

class Input {
    public static void main(String[] args) {
    	
    	Scanner input = new Scanner(System.in);
    	
    	// Getting float input
    	System.out.print("Enter float: ");
    	float myFloat = input.nextFloat();
    	System.out.println("Float entered = " + myFloat);
    	
    	// Getting double input
    	System.out.print("Enter double: ");
    	double myDouble = input.nextDouble();
    	System.out.println("Double entered = " + myDouble);
    	
    	// Getting String input
    	System.out.print("Enter text: ");
    	String myString = input.next();
    	System.out.println("Text entered = " + myString);
    }
}

When you run the program, the output will be:

Enter float: 2.343
Float entered = 2.343
Enter double: -23.4
Double entered = -23.4
Enter text: Hey!
Text entered = Hey!