Scanner Class and Static Import with Example

java.util.Scanner class provides convenient methods to read data in the form of primitive type as well as string from the keyboard. A simple text scanner which can parse primitive types and strings using regular expressions.

A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace. The resulting tokens may then be converted into values of different types using the various next methods.

Constructor:

public Scanner(InputStream)

Methods:

public int nextInt() : Scans the next token of the input as an int.

public int nextFloat():Scans the next token of the input as Float
public int nextDouble():Scans the next token of the input as Double.
public String nextLine():Scans the next token of the input as String.

Simple Example:

import java.util.Scanner;

/**

 *

 * @author Navindra Jha

 */

public class Adder {

    public static void main(String as[]) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter First Number:");

        int num1 = sc.nextInt();

        System.out.println("Enter Second Number:");

        int num2 = sc.nextInt();

        int num3 = num1 + num2;

        System.out.println("Sum=" + num3);

    }

}

Static import

Provide the facility to import all the static members of a class and interface. Once imported they can be directly refer without any reference to the class or interface name.

Syntax: import static pkgName.ClassName.staticMember;

Or

Import static pkgName.ClassName.*;

Example:

import static java.lang.System.*;

/**

 *

 * @author Navindra Jha

 */

class HelloImport {

    public static void main(String as[]) {

       out.println("Hello Static import");

    }

}