- Java.util Package Classes
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- Java.util - Scanner
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Java.util.Scanner.hasNext() Method
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