Java Scanner hasNext(String pattern) method example

java.util.Scanner hasNext(String pattern)

Description :

This java tutorial shows how to use the hasNext(String pattern) method of Scanner class of java.util package. This method returns a boolean data type which corresponds if there is an available token given a String pattern specified as method argument.

Method Syntax :

public boolean hasNext(String pattern)

Parameter Input :

 

 

Method Returns :

This method simply returns boolean which corresponds the result of pattern matching. Returns true if the Scanner has token that matches the String pattern specified as method argument.

Compatibility Version :

Requires Java 1.5 and up

Exception :

None

Discussion :

The Scanner hasNext(String pattern) method is used a flag if we can iterate further on the String tokens. This is a shortcut of calling the hasNext(Pattern.compile(String pattern)) which yields the same result.

Java Code Example :

This java example source code demonstrates the use of hasNext(String pattern) method of Scanner class. Basically we just check if the pattern satisfies the next token.

package com.teknoscope.java.tutorial.scanner;

import java.util.Scanner;

/*
 * This is an example source code that shows the usage of hasNext(String pattern)
 * method of Scanner class
 * Java Tutorial
 */

public class ScannerHasNextStringPatternDemo {

	public static void main(String[] args) {

		// Initialize Scanner object
		Scanner scan = new Scanner("Names:Anna;William;Kingsly");
		// Initialize the String pattern
		String pattern = "Names:.*";
		// check if pattern satisfies the String content
		if(scan.hasNext(pattern)){
			System.out.println("Pattern found");
		}
		else{
			System.out.println("Pattern not found");
		}
		// closing the scanner stream
		scan.close();

	}

}

Sample Output :

Running the hasNext(String pattern) method example source code of Scanner class will give you the following output

Exception Scenario :

N/A

Similar Method :

• N/A

Suggested Reading List :

• Scanner Class

References :

• Oracle Java 7 API