Scanner Method

 

SCANNER

While creating applications or websites using Java, it’s ultimately necessary to obtain the input data from the user. In such cases, this scanner functions holds the possible solution.

System.out function prints out the output whereas, System.in function is used to get the input values. The data type of the variable must necessarily match the data type of the input value. While using Scanner variable, we have to import java.util.Scanner library.  

Steps to declare an integer using Scanner function

1.    1. Declare a variable to int data type

             int x;

2.   2. To obtain the input data from user, System.in function is used along with          the new keyword

             Scanner input=new Scanner(System.in);

3.  3. Finally, the integer variable declared in Step 1, is assigned with the input          using nextInt( ) function.

x          x= input.nextInt();

Simple Java code to determine a person is eligible to vote using Scanner function

import java.util.Scanner;

class java {

    public static void main(String args[]) {

       //Output

        System.out.println("enter your age");

        //Input

        int age;

        Scanner input=new Scanner(System.in);

        age= input.nextInt();

        //Output

        System.out.print("You are ");

        //Ternary Conditional Statement

        String output= age >=18 ? "eligible to vote" : "not eligible to vote";

        System.out.print(output);

    }

}

To learn the concept of Ternary Conditional Statement, you can CHECK HERE.

Output

Steps to declare a string using Scanner function

1.    1. Declare a variable to string data type

            String x;

2.   2. To obtain the input data from user, System.in function is used along with         the new keyword

           Scanner input=new Scanner(System.in);

3.   3. Finally, the integer variable declared in Step 1, is assigned with the input         using next( ) function.

            x= input.next();

For strings, in step 3 we have to use next( ) function whereas for integer data type, we have to use nextInt( ) function.

Note: Using Next keyword, only a single word can be printed. If you are interested in printing several words, nextInt( ) function can be used.

Java code to print name using Scanner function

import java.util.Scanner;



class java {

    public static void main(String args[]) {

       //Output

        System.out.println("enter your name");

        //Input

        String name;

        Scanner input=new Scanner(System.in);

        //To obtain several strings

        name= input.nextLine();

        //Output

        System.out.print("Have a great day " + name);

    }

} 

Output

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