Java Scanner next() Method

The next() is a method of Java Scanner class which finds and returns the next complete token from the scanner which is in using. There are three different types of Java Scanner next() method which can be differentiated depending on its parameter. These are:

Java Scanner next() Method
Java Scanner next(String pattern) Method
Java Scanner next(Pattern pattern) Method

1. Java Scanner next() Method

It is a Scanner class method used to get the next complete token from the scanner which is in using. A complete token is preceded and followed by input that matches the delimiter pattern.

2. Java Scanner next(String pattern) Method

It is a Scanner class method which returns the next token if it matches the pattern constructed from the specified string.

3. Java Scanner next(Pattern pattern) Method

It is a Scanner class method which returns the next token if it matches the specified pattern.

Syntax

Following are the declarations of next() method:

public String next()
public String next(String pattern)
public String next(Pattern pattern)

Parameter

DataType	Parameter	Description	Required/Optional
String	pattern	It is a string specifying the pattern to scan.	Required
Pattern	pattern	It is the pattern to scan for specified string.	Required

Returns

The next() method returns the next complete tokens.

Exceptions

NoSuchElementException- It will thrown this Exception if no more tokens are found.

IllegalStateException- It will thrown this Exception if the innvocation is done after Scanner is closed.

Compatibility Version

Java 1.5 and above

Example 1

import java.util.*;
public class ScannerNextExample1 {  
	public static void main(String[] args) {	
		System.out.print("Enter full name: ");		
		//Create scanner object and read the value from the console
		Scanner scan = new Scanner(System.in);
		//Read the first token
		String firstName = scan.next();
		//Read the second token
		String lastName = scan.next();
		//Print the token values read by Scanner object
		System.out.println("First Name is: "+firstName);
		System.out.println("Last Name is: "+lastName);	
		scan.close();

	}
}

Output:

Enter full name: Hritik Roshan
First Name is: Hritik
Last Name is: Roshan

Example 2

import java.io.File;
import java.io.FileNotFoundException;
import java.util.*;  
public class ScannerNextExample2 {  
     public static void main(String args[]) throws FileNotFoundException{ 
    	      //Declare File object
 		File file = new File("/home/javatpoint/Desktop/ABHISHEK/AngularJS/Index/abc.txt");
 		//Initialize the scanner
 		Scanner scan = new Scanner(file);
 		// iterate through the file line by line
 		while(scan.hasNextLine()){
 			//Print the contents of a file by line
 			System.out.println(scan.next());
 		}
 		scan.close();
     }  
} 

Output:

hasNextLine
public
boolean
hasNextLine()
IllegalStateException

Example 3

import java.util.*;  
public class ScannerNextExample3 {  
     public static void main(String args[]) { 
    	 String s = "Facebook.com \n JavaTpoint.com 22 60.0";
         //Create a new scanner with the specified String Object
         Scanner scanner = new Scanner(s);
         //Find the next token and print it
         System.out.print("Token Value1 " + scanner.next());
         System.out.print("\nToken value2: " + scanner.next());
         scanner.close();
     }  
} 

Output:

Token Value1 Facebook.com
Token value2: JavaTpoint.com

Example 4

import java.util.*;  
public class ScannerNextExample4 {  
     public static void main(String args[]) { 
    	//Initialize Scanner object
 		Scanner scan = new Scanner("22 313 45 87");
 		//Intialize the String pattern
 		String pattern = "[0-9]*";
 		//Print the tokenized Strings
 		while(scan.hasNext()){
 			System.out.println("tokenized Strings: "+scan.next(pattern));
 		}
 		scan.close();
     }  
} 

Output:

tokenized Strings: 22
tokenized Strings: 313
tokenized Strings: 45
tokenized Strings: 87

Example 5

import java.util.*;
import java.util.regex.Pattern;
public class ScannerNextExample5 {  
    public static void main(String args[]){   	
    	  String str = "JavaTpoint Hello World!";
        Scanner scanner = new Scanner(str);
        //Check if next token matches the pattern and print it
        System.out.println("" + scanner.next(Pattern.compile(".....point")));
        //Check if next token matches the pattern and print it
        System.out.println("" + scanner.next(Pattern.compile("..llo")));
        scanner.close();
        }  
}

Output:

JavaTpoint
Hello

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