User Input in Java

User Input

Instead of writing hard-coded values. If you want to take input from the user, you can use the Scanner class and easily take input from the user.

Steps For User Input In Java

First import java.util.Scanner;.
Create object of Scanner Scanner sc = new Scanner(System.in);.
Take input from user.

Integer User Input

If you want to take integer input from the user, you can use nextInt() method of Scanner class.

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
            
            System.out.println("Enter Number: ");
            int num = sc.nextInt();
            System.out.println("The number you typed is "+num);
    }
}

Show Output

String User Input

If you want to take string input from the user, you can use nextLine() method of Scanner class.

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter Name: ");
        String name = sc.nextLine();
        System.out.println("The name you typed is "+name);
    }
}

Show Output

Floating Point User Input

If you want to take floating point input from the user, you can use nextFloat() method of Scanner class.

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
            
                    System.out.println("Enter Number: ");
                    double number = sc.nextDouble();
            
                    System.out.println("The number you typed is "+number);
    }
}

Show Output

Example

Taking first name and last name from user and to print full name.

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter first name: ");
        String firstName = sc.nextLine();
        System.out.println("Enter last name: ");
        String lastName = sc.nextLine();

        String fullName = firstName + " "+ lastName;
        System.out.println("Your fullname is "+fullName);
    }
}

Show Output

Methods	Description
sc.nextInt()	For integer user input.
sc.nextFloat()	For float user input.
sc.nextDouble()	For double user input.
sc.nextLine()	For text/ String user input.
sc.nextBoolean()	For boolean user input.