learn java - Scanner class

The java.util.Scanner class is one way to read data enter by the user, using an appropriate input device such as keyboard.
The Java Scanner class breaks the input into tokens using a delimiter that is whitespace bydefault. It provides many methods to read and parse various primitive values.

Commonly used methods of Scanner class

There is a list of commonly used Scanner class methods:

Method	Description
public String next()	it returns the next token from the scanner.
public String nextLine()	it moves the scanner position to the next line and returns the value as a string.
public byte nextByte()	it scans the next token as a byte.
public short nextShort()	it scans the next token as a short value.
public int nextInt()	it scans the next token as an int value.
public long nextLong()	it scans the next token as a long value.
public float nextFloat()	it scans the next token as a float value.
public double nextDouble()	it scans the next token as a double value.

Screen shot

Declare the object Input with the datatype Scanner

Using nextLine() method:

Using next() method:

Source code

package interactivehello;
import java.util.Scanner; // Bring in the scanner to read input
public class InteractiveHello {
    public static void main(String[] args) {
        // make new object of class Scanner, based on System.in and call it input
        Scanner input = new Scanner(System.in);
        
        System.out.println("first method to use java Scanner class(nextLine() method):");
        
        System.out.print("Enter your name ==> ");   
        String name = input.nextLine();
        System.out.printf("Hello,%s\n", name); // say hello
        
        System.out.print("Enter your age ==> ");
        String age = input.nextLine();
        System.out.printf("your age is,%s\n", age);
        
        System.out.print("Enter your address ==> ");
        String address = input.nextLine();
        System.out.printf("your address is,%s\n", address);
        
        System.out.print("Enter your phone number ==> ");
        String phone = input.nextLine();
        System.out.printf("your phone number is,%s\n", phone);
        
        System.out.println("second method to use java Scanner class(next() method):"); 
        System.out.print("Enter your name, age, phone number separate them with a space ==> ");
        String name2 = input.next();
        String age2 = input.next();
        String phone2 = input.next();
        System.out.printf("Summary: name is:%s, age is:%s ,phone number is:%s \n ", name2,age2,phone2);
        System.exit(0); // exit console
    }
}

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