Java.util.Scanner.hasNext() Method


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Description

The java.util.Scanner.hasNext(String pattern) method returns true if the next token matches the pattern constructed from the specified string. The scanner does not advance past any input. An invocation of this method of the form hasNext(pattern) behaves in exactly the same way as the invocation hasNext(Pattern.compile(pattern)).

Declaration

Following is the declaration for java.util.Scanner.hasNext() method

public boolean hasNext(String pattern)

Parameters

  • pattern -- a string specifying the pattern to scan

Return Value

This method returns true if and only if this scanner has another token matching the specified pattern

Exception

  • IllegalStateException -- if this scanner is closed

Example

The following example shows the usage of java.util.Scanner.hasNext() method.

package com.tutorialspoint;

import java.util.*;
import java.util.regex.Pattern;

public class ScannerDemo {

   public static void main(String[] args) {

   String s = "Hello World! 3+3.0=6";

   // create a new scanner with the specified String Object
   Scanner scanner = new Scanner(s);

   // check if the scanner's next token matches "World"
   System.out.println("" + scanner.hasNext("World"));

   // check if the scanner's next token matches "Hello"
   System.out.println("" + scanner.hasNext("Hello"));

   // print the rest of the string
   System.out.println("" + scanner.nextLine());

   // close the scanner
   scanner.close();
   }
}

Let us compile and run the above program, this will produce the following result:

false
true
Hello World! 3+3.0=6

java_util_scanner.htm

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