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- Java.util - Properties
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- Java.util - Scanner
- Java.util - ServiceLoader
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- Java.util - Stack
- Java.util - StringTokenizer
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- Java.util - TimeZone
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- Java.util Package Extras
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Java.util.Scanner.hasNext() Method
Description
The java.util.Scanner.hasNext(Pattern pattern) method returns true if the next complete token matches the specified pattern. A complete token is prefixed and postfixed by input that matches the delimiter pattern. This method may block while waiting for input. The scanner does not advance past any input.
Declaration
Following is the declaration for java.util.Scanner.hasNext() method
public boolean hasNext(Pattern pattern)
Parameters
pattern − the pattern to scan for
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 "rld" following 2 chars System.out.println("" + scanner.hasNext(Pattern.compile("..rld"))); // check if the scanner's next token matches "llo" following 2 chars System.out.println("" + scanner.hasNext(Pattern.compile("..llo"))); // 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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