- Java.util Package Classes
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- Java.util - HashMap
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- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
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- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java Scanner tokens() Method
Description
The java Scanner tokens() method returns a stream of delimiter-separated tokens from this scanner. The stream contains the same tokens that would be returned, starting from this scanner's current state, by calling the next() method repeatedly until the hasNext() method returns false. The resulting stream is sequential and ordered. All stream elements are non-null.
Declaration
Following is the declaration for java.util.Scanner.tokens() method
public Stream<String> tokens()
Parameters
NA
Return Value
This method returns the BigDecimal scanned from the input
Exception
InputMismatchException − if the next token does not match the Decimal regular expression, or is out of range
NoSuchElementException − if the input is exhausted
IllegalStateException − if this scanner is closed
Getting Stream of Tokens of a Scanner on a String Example
The following example shows the usage of Java Scanner tokens() method to get a stream of tokens scanned. We've created a scanner object using a given string. Then we get the stream of tokens using tokens() method and iterated them to print. In the end scanner is closed using close() method.
package com.tutorialspoint; import java.util.Scanner; import java.util.stream.Stream; 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); Stream<String&t; tokens = scanner.tokens(); tokens.forEach(t -> System.out.println(t)); // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result −
Hello World! 3 + 3.0 = 6
Getting Stream of Tokens of a Scanner on User Input Example
The following example shows the usage of Java Scanner tokens() method to get a stream of tokens scanned. We've created a scanner object using a System.in class. Then we get the stream of tokens using tokens() method and iterated them to print. In the end scanner is closed using close() method.
package com.tutorialspoint; import java.util.Scanner; import java.util.stream.Stream; public class ScannerDemo { public static void main(String[] args) { // create a new scanner with the System input Scanner scanner = new Scanner(System.in); Stream<String&t; tokens = scanner.tokens(); tokens.forEach(t -> System.out.println(t)); // close the scanner scanner.close(); } }
Output
Let us compile and run the above program, this will produce the following result − (We've entered Hello World.)
Hello World Hello World
Getting Stream of Tokens of a Scanner on Properties File Example
The following example shows the usage of Java Scanner tokens() method to get a stream of tokens scanned. We've created a scanner object using a file properties.txt. Then we get the stream of tokens using tokens() method and iterated them to print. In the end scanner is closed using close() method.
package com.tutorialspoint; import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; import java.util.stream.Stream; public class ScannerDemo { public static void main(String[] args) throws FileNotFoundException { // create a new scanner with a file as input Scanner scanner = new Scanner(new File("properties.txt")); Stream<String&t; tokens = scanner.tokens(); tokens.forEach(t -> System.out.println(t)); // close the scanner scanner.close(); } }
Assuming we have a file properties.txt available in your CLASSPATH, with the following content. This file will be used as an input for our example program −
Hello World! 3 + 3.0 = 6
Output
Let us compile and run the above program, this will produce the following result −
Hello World! 3 + 3.0 = 6
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